U.S. patent number 3,810,602 [Application Number 05/244,503] was granted by the patent office on 1974-05-14 for ceramic disk faucet.
This patent grant is currently assigned to American Standard Inc.. Invention is credited to Richard Grant Parkinson.
United States Patent |
3,810,602 |
Parkinson |
May 14, 1974 |
**Please see images for:
( Certificate of Correction ) ** |
CERAMIC DISK FAUCET
Abstract
This covers a control valve for a kitchen or like faucet
embodying a cartridge or container housing two contiguous ceramic
disk elements and a vertical rotary stem. One of the elements is
positioned at the base of the stem and is a rotatable member while
the other element is a stationary member upon which the rotatable
member is slid. The stationary member has inlet and outlet ports
both so arranged that, when the movable member is rotated about its
axis through a limited angle, the movable member is rotated about
its axis through a limited angle, the movable member will be
rotatably slid over both ports of the stationary ceramic member to
determine the relative sizes of the openings of both ports. Either
hot water or cold water, whichever is fed to the inlet port, may be
transmitted through the valve and the angular position of the
movable member will alone control the volume of water flow through
the valve. The slidable member includes a cavity having a plurality
of steps or ridges positioned in the path of the water reaching the
slidable member, and they reduce the noise level that would
otherwise be developed upon water flow through the valve. The
entire flow path within the valve is essentially free of parts
which expand or contract to vary the flow as the water temperature
changes. Each angular valve setting will correspond to a particular
flow rate which may be changed as desired but will remain
independent of changes in the water temperature.
Inventors: |
Parkinson; Richard Grant
(Somerville, NJ) |
Assignee: |
American Standard Inc. (New
York, NY)
|
Family
ID: |
22923023 |
Appl.
No.: |
05/244,503 |
Filed: |
April 17, 1972 |
Current U.S.
Class: |
251/304 |
Current CPC
Class: |
F16K
19/006 (20130101); F16K 11/0746 (20130101) |
Current International
Class: |
F16K
11/06 (20060101); F16K 11/074 (20060101); F16k
031/60 () |
Field of
Search: |
;137/625.17,359
;251/304,368 ;85/45 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
322,273 |
|
Dec 1929 |
|
GB |
|
809,548 |
|
Feb 1959 |
|
GB |
|
466,637 |
|
Nov 1951 |
|
IT |
|
Primary Examiner: Klinksiek; Henry T.
Attorney, Agent or Firm: Ehrlich; Jefferson Crooks; Robert
G.
Claims
What is claimed is:
1. A faucet valve for controlling the rate of flow of fluid between
a first conduit and a second conduit to be coupled to the valve,
comprising first and second ceramic disks in contact with each
other so as to have a common interface, the first disk having only
two apertures for the flow of fluid, means in the valve to hold
said first disk against rotation, said two apertures extending
through said disk and coupled respectively to said first and second
conduits, the second disk having an elongated unapertured cavity at
the common interface of sufficient length and depth so as to
provide the sole coupling between the two apertures, manually
controlled means peripherally coupled to the second disk for
slidably rotating the second disk about a single axis always
perpendicular to the common interface for changing the position of
its cavity with respect to both apertures and thereby adjusting the
fluid flow rate, said manually controlled means including a
substantially cylindrical rotary stem mechanically retaining the
second disk at one end of said stem, said manually controlled means
including means to prevent any motion other than rotary motion of
the second disk and to prevent any change in the spacing between
the two disks, and resilient means for applying pressure against
one of the disks for continuously maintaining the two disks in
physical contact with each other at the interface during all
changes in pressure of the incoming fluid and during all rotations
of the second disk.
2. A faucet valve according to claim 1 in which the manipulation of
the stem controls only the angular rotation of the second disk, the
valve including a substantially cylindrical collar within which the
stem is confined so that the second disk is slidably rotatable
solely about its axis.
3. A faucet valve according to claim 2 including a housing
enclosing the first and second disks and the lower segment of the
stem, the resilient means including cylindrical elastomer rings
inserted within said apertures of said first disk to apply pressure
to the first disk to maintain it in contact with the second disk at
the interface, and a cap for supporting said elastomer rings and
holding said elastomer rings against the first disk.
4. A faucet valve according to claim 3 including a handle coupled
to the upper segment of the stem for manually imparting rotation to
the stem.
5. A valve for the control of the rate of flow of fluid through a
plumbing fitting, comprising a longitudinal non-translatory stem
which is rotatable and movable only about its axis without being
movable in any other direction, a rotatable solid disk affixed to
the base of said stem and rotatable through an angle corresponding
to the angle of rotation of the stem and having a longitudinal
fluid coupling cavity therein, a stationary solid disk having two
parallel identical apertures therein for for the flow of the
controllable fluid therethrough, the rotatable disk being slidable
along the adjacent surface of the stationary disk, means for
applying pressure between the two disks for maintaining the two
disks in continuous slidable contact with each other and
independent of the fluid pressure whenever the stem is axially
rotated, the cavity of the rotatable disk being variably and
adjustably alignable with the two apertures of the stationary disk
and variably and adjustably dis-aligned with said apertures upon
the axial rotation of the stem, the cavity providing the coupling
between the two apertures to control the flow of fluid through and
between said apertures, two conduits respectively coupled to the
two apertures of the stationary disk, one of the apertures being
supplied with pressurized water and the other aperture exiting the
pressurized water received from the first aperture and transmitted
through the cavity of the rotatable disk, said means for
maintaining the two disks in continuous slidable contact including
a housing having a collar within which the stem is guided to enable
the stem to be moved only in rotation about its axis for holding
the rotatable disk against movement other than rotary movement, and
a stationary abutment means for limiting the angular rotations of
the stem and the rotatable disk, said latter means comprising
projections on said stem and corresponding curvatures about the rim
of the rotatable disk.
6. A valve for the control of the rate of flow of fluid through a
plumbing fitting, comprising first and second solid disks stacked
together so as to be in continuous contact with each other, the
first disk having a first aperture for the reception of fluid and a
second substantially equal aperture for the discharge of the
received fluid, an abutment means for holding the first disk
stationary, the second disk having a cavity but no apertures, the
cavity of the second disk fluidically coupling the two apertures to
each other, a rotatable longitudinal stem the end of which has
means to hold said stem perpendicular to the second disk to
slidably rotate the second disk about its axis and along the
adjacent surface of the first disk and to control the angle of
slidable rotation of the second disk upon the surface of the first
disk, the two disks being held in contact with each other
throughout each rotation of the second disk, the valve having means
to hold the stem non-movable longitudinally so as to maintain the
surface contact between the two disks unchanged and to prevent any
motion of the second disk except its rotary motion, whereby the
rotation of the second disk in response to the rotation of the stem
will control the volume of fluid flow from said first aperture
through said cavity and exiting through said second aperture.
7. A valve according to claim 6, in which the cavity of the second
disk is formed to have a plurality of steps having ridges for
reducing the noise developed by the flow of fluid through the
cavity.
8. A valve according to claim 7, including elastomer means for
applying pressure between the two disks to maintain them in
continuous contact with each other during the rotations of the stem
and the second disk.
9. A valve according to claim 8, including a housing for enclosing
and retaining the stem and the two disks in their respective
positions, said housing providing the abutment means an abutment
for holding the first disk continuously against any movement.
10. A valve according to claim 9 in which the disks are made of
alumina ceramic material.
11. A valve according to claim 10 including a thrust washer
interposed between the stem and the housing, said washer having a
low coefficient of friction.
12. A valve for a plumbing fitting for the control of the rate of
the flow of fluid through the fitting, comprising a longitudinal
stem which is rotatable about its axis but is not movable in any
other direction along its axis, a first solid disk having a first
aperture for receiving fluid and a second substantially identical
aperture for discharging the received fluid, means for holding the
first disk stationary, means for adjustably coupling the apertures
of the first disk to each other to control the rate of flow of
fluid between said apertures, said coupling means including a
second solid disk having a cavity therein but no aperture so that
fluid may flow from said first aperture through the cavity and out
of the second aperture, said second disk having at least one
projection which mates with a corresponding projection formed on
one end of said stem so that, in response to any rotation of said
stem about its axis, said second disk will slidably rotate about an
axis and along the surface of the first disk to change the position
of said cavity between the apertures of the first disk to control
the fluid flow rate through the valve, and a stationary cylindrical
collar within which the stem is rotatable to prevent any non-axial
rotation of the stem and of the second disk.
13. A valve according to claim 12 including means supported beneath
the first disk for continuously holding the first disk stationary,
and for applying pressure against the first disk to hold it in
continuous contact with the second disk throughout all rotations of
the second disk.
14. A valve according to claim 13 including first and second
elastomer cylindrical units which are larger in their external
diameters than the diameters of the apertures of the first disk and
are positioned between the first disk and the support means so as
to be coaxially within the respective first and second apertures,
said cylindrical units applying continuous mechanical pressure
between the support means and the first disk.
15. A valve according to claim 14, including a housing for
enclosing the two disks and the stem but apertured for exposing the
upper end of the stem so that it may be manually rotated about a
single axis to control the volume flow rate through the valve.
16. A valve according to claim 15, including a handle which is
affixed to the upper end of the stem to be manipulated to control
the rotary movement of the stem
17. A faucet valve for controlling the rate of flow of fluid
between a first conduit and a second conduit to be coupled to the
valve, comprising first and second ceramic disks in contact with
each other so as to have a common interface, the first disk having
two apertures extending through said disk and coupled respectively
to said first and second conduits, the second disk having an
elongated unapertured cavity at the common interface of sufficient
length and depth so as to provide the sole coupling between the two
apertures, manually controlled means peripherally coupled to the
second disk for slidably rotating the second disk about a single
axis always perpendicular to the common interface for adjusting the
fluid flow rate without rotating the first disk and without
changing the spacing between the two disks, resilient means for
applying pressure against one of the disks for continuously
maintaining the two disks in physical contact with each other at
the interface during all changes in pressure of the incoming fluid
and during all rotations of the second disk, said manually
controlled means includes a substantially cylindrical rotary stem
mechanically retaining the second disk at one end of said stem to
control the angular rotation of the second disk and also includes a
substantially cylindrical collar within which the stem is confined
so that the stem is slidably rotatable solely about the same axis,
a housing enclosing the first and second disks and the lower
segment of the stem, elastomer means inserted within said apertures
of said first disk to apply pressure to the first disk to maintain
it in contact with the second disk at the interface, a cap for
supporting said elastomer means and holding said elastomer means
against the first disk, and a handle coupled to the upper segment
of the stem manually imparting rotation to the stem, the base of
the stem and the second disk having projections for limiting the
slidable rotation of the second disk and the angular rotation of
the stem and for mechanically coupling both disks to each other.
Description
This application relates to control valves such as may be used in
faucets providing hot and cold water to various plumbing fixtures,
such as shower stalls or kitchen sinks or lavatories. The present
invention is directed to an improved control valve that is superior
in performance characteristics, ease of operation, ease of
maintenance, and life span when compared to a conventional or
so-called compression type of valve quite commonly and generally
used for decades in faucets for plumbing fixtures.
This application discloses apparatus which is especially
appropriate for use in a plumbing fixture employing a faucet
coupled to two separate valves, each having a lever to control the
hot and cold water, respectively, or a mixture thereof, supplied to
the faucet of the plumbing fixture. In my Pat. Nos. 3,433,264 and
3,533,436, issued on Mar. 18, 1969 and Oct. 13, 1970, respectively,
there are disclosed valve structures with ceramic discs which are
actuated by a single lever that is tiltable and rotatable to
simultaneously control the flow and mixture of hot and cold water
emitting from the faucet. Faucets manufactured under or conforming
to these cited patents have gained good acceptance for their
convenience, trouble-free operation, and reliability. However,
there are many users who prefer to keep the convention of having
two independent control levers, rather than a single control lever,
so that they may separately and independently control the hot and
cold water supplies, and such users would also like to have the
high performance and reliability and smoothness of operation of a
valve structure, such as disclosed in the above-mentioned patents,
which employ ceramic disks. The valve structure to be disclosed in
this application fills that need and at the same time embodies
additional features an qualities, as will be briefly explained
hereinafter.
BACKGROUND OF THE INVENTION
In the conventional faucet for a plumbing fixture, or in a shower
head, there is a handle on the left for controlling the flow of hot
water and a separate handle on the right for controlling the flow
of cold water. When both handles are manipulated, whether
independently or simultaneously, the desired temperature of the
exiting water delivered from the spout or shower head can be
controlled, although often with great difficulty. In the
conventional faucet, each control valve is composed of a
handle-controlled rotary stem at one end of which a rubber-like or
flexible substantially flat circular element, commonly called a
seat washer, is affixed by means of a screw serving to hold the
rubber-like (elastomer) seat washer element at the end of the stem.
The control valve is equipped with a valve seat positioned upon and
concentric with the input water port, the valve seat being
stationary and positioned opposite the vertically movable
rubber-like seat washer element. In the conventional faucet, by
rotation of the stem, the rubber-like element may be moved
vertically toward or away from the valve seat to close or open the
water input port as may be desired. When the valve is to be closed,
the handle-controlled stem is therefore rotated in one direction so
as to advance the rubber-like seat washer element along its axis
toward and against the valve seat which is usually positioned at
the top of the input water port to seal the valve seat and its
input water port to cause the flow of water to be stopped. On the
other hand, when the stem is rotated in the opposite direction, the
rubber-like seat washer element becomes displaced from the valve
seat along the very same axis so as to open the input water port
and allow water to flow through the control valve to an output
port. This type of mechanism, in which the rubber-like seat washer
element is changed in its parallel spacing from the valve seat and
from the input water port, is widely used in control valves to
control the flow rate of the water through faucets which are parts
of plumbing fixtures, such as sinks or lavatories.
There are many limitations and defects in the conventional control
valve of the type just referred to. For example, the elastomer seat
washer is subjected to considerable abrasive wear and this it due
principally to the amount of mechanical pressure that is usually
applied to the elastomer in closing and opening the valve. As the
valve is closed, the elastomer seat washer, which is attached to
the stem, is rotated with a twisting motion so as to drive the seat
washer against the valve seat in attaining a good shut-off of the
valve. This highly abrasive rotary or shearing motion causes wear
both to the elastomer seat washer and to the surface of the valve
seat which is usually metallic. In due course, the elastomer seat
washer becomes worn down or cut away to render its surface uneven
so that a good clean valve closure of the washer against the
metallic valve seat may not be achievable. This usually results in
difficulty in closing the valve and the difficulty necessarily
increases with time. Greater mechanical pressure on the handle is
then required to open and close the valve. Abrasion and wear are
further magnified in localities where the water supply pressure is
high because, in such areas, still greater forces are required to
open or close the valve. This erosion also often results in leakage
and wastage of water through the control valve due to the ridges
and nicks developed in the washer and perhaps also in the valve
seat. Because of this known inherent weakness of the control valve,
too much pressure is customarily applied to the handle of the
control valve to fully close the valve to prevent leakage and
wastage of water. Users of the faucet, because of their past
experiences with leaky faucets, tend to be heavy-handed and usually
shut off the faucet with a manual force many times greater than is
required and this further expands the wear and abrasion on the
rubber seat washer and of the metallic valve seat. Experience
abundantly reveals that, in the absence of sufficient closing
pressure, the valve will indeed leak and waste water needlessly.
The usual high manual pressure for mechanically closing the valve
is ordinarily considered imperative to prevent the constant leakage
and loss of water. It is because of this abnormal manual pressure
customarily required to open and close the conventional valve that
many people, especially children and old an infirm people, find it
difficult, and sometimes impossible, to open the valve when they
desire to start the flow of water and find it equally difficult to
close the valve when water is no longer required. This constitutes
a serious and long-standing difficulty with conventional water
control valves for conventional plumbing fixtures.
Moreover, the rubber washer and the valve seat of the conventional
control valve are often subjected to a number of environmental
conditions that additionally shorten their lives. Commonly, sand or
other foreign particles are found in the water system and, when
caught between the rubber washer and the seat, often become
embedded in the rubber washer and scratch the valve seat as the
faucet valve is closed. When a scratch or nick is made in the valve
seat, more force is naturally required by the user to fully close
the valve to eliminate leakage and a shortened life of the valve is
inevitable. If a faucet having this type of valve structure is
allowed to drip for a length of time, the pressurized water under
relatively higher velocity in passing through a small nick in the
valve seat will erode the seat in due course, causing the scratch
or nick to enlarge. This causes a larger leak, quite naturally, and
a correspondingly higher manual force on the handle will be
required to avoid a dripping faucet when it is turned off. This is
commonly known as wire-drawing of the seat. The sight of the leaky
faucet is not uncommon in many places.
Besides the environmental problems of abrasive particles in a water
supply, water in many areas contains chemical substances which
corrode the common brass or bronze valve seat. Such corrosion
shortens the life of the valve seat, whereupon the valve may have
to be replaced in a period of time, perhaps six months.
Repairing a leaky valve in a conventional faucet is not an easy
task for a homeowner and, at times, it is difficult or impossible
even for a master plumber. After a conventional faucet is in
service for some time, corrosion and liming combine to seize or
lock the threads on various faucet parts. Difficulty can be
encountered in removal of gland nuts, lock nuts, and screws holding
the seat washers to the stems. Removal of the valve seat is usually
not even attempted by the homeowner and, at times, this is found
impossible even by the master plumber. Replacement of the entire
faucet is costly, especially a bathtub faucet where part of a tile
wall must sometimes be removed to install a new faucet.
Furthermore, in the conventional compression type of valve produced
for a shower head, the temperature-sensitive elastomer washer
element will have a minimal dimension when the valve is closed or
when cold water is received, but the element will expand when it is
subjected to the elevated temperature of hot water. Hence, the size
of the opening of the valve having such an expandible and
contractable element in the control path will vary, depending upon
the temperature of the incoming water. As the temperature rises and
the elastomer element necessarily expands, the size of the water
opening will be correspondingly reduced and soon reduce the amount
of warm or hot water delivered through the valve. This can be
especially uncomfortable in a shower stall because the temperature
of the water will change even though the user intends to maintain
the temperature substantially constant and therefore has not
re-adjusted the valve. This constitutes another important
deficiency in the common conventional compression type of valve and
points up an added reason for effectively removing elastomer
elements from essential flow paths or otherwise minimizing the
difficulties that may be developed by their presence.
Other structural features of a conventional faucet also contribute
to the difficulty in achieving the proper adjustment of the valve
by the user to get the desired flow rate and the desired
temperature of the water. For example, the normal looseness of the
meshing stem threads causes variations in the valve opening, the
magnitude of the variations usually depending upon whether the
handle of the valve is being adjusted toward its open position or
toward its closed position. As the threads wear with use, this
condition becomes more acute.
Many, if not all, of the above-noted difficulties have been plainly
obvious throughout the decades, but very little has been done to
remedy and obviate the difficulties which are ever present even in
newly constructed homes.
SUMMARY OF THE INVENTION
Accordingly, a control valve has been achieved according to this
invention which is virtually free of many, if not all, of the
infirmities and difficulties of prior conventional mechanisms for
plumbing fittings. The valve of this invention may be used
interchangeably for either hot water or cold water, whether for
kitchens or bathrooms. The present invention is, therefore,
directed to a highly improved, simplified, long-lived, and
relatively silent control valve which may be opened repeatedly or
intermittently through a predetermined angle to establish a
corresponding predetermined volume flow rate, and opened through
another predetermined angle to obtain another corresponding
predetermined volume flow rate, and closed, whenever desired, to
completely shut off the flow of water. All of these improvements in
the opening and closing of the valve of this invention may be
accomplished with ease and without the employment of excessive
manual or mechanical pressure and without damage to or destruction
of any of the movable and stationary elements. This valve
structures meets a long felt want, especially because it virtually
eliminates the serious difficulties encountered in conventional
water control valve for conventional plumbing fixtures.
In accordance with the present invention, the control valve
includes a pair of hard contacting ceramic members, one of which is
always stationary and entirely free of any motion, while the other
member is controlled by a rotary stem which never moves axially, so
that the other element is always in slidable contact with the
stationary element to control the volume flow rate of the water.
When the handle-controlled stem of the control valve is rotated for
opening the valve, the slidable ceramic element will be slid along
the surface of the stationary ceramic element and the slidable
element may be moved over an angle which corresponds to the angle
of rotation of the stem to achieve a predetermined opening of the
valve port without changing the spacing or continuous contact
between both ceramic elements. If the stem is rotated a bit further
in the same direction, the valve port will be further opened by a
proportional increment. On the other hand, when the stem is rotated
in the opposite direction, the valve port will be substantially
reduced in size to reduce the volume flow rate of water. When the
stem is rotated further in the opposite direction through a
sufficient angle, the valve port will be closed and there will be
no further flow of water through the valve.
Thus, a rotational movement of the handle-controlled stem of the
valve from its initial open position or its initial closed position
will cause, for each individual angular rotation of the stem, a
predetermined and corresponding change in the opening of the port
of the valve. The proportionality of the changes in the flow rates
will remain substantially the same in both directions of change.
The mechanism will be substantially free of wear and erosion for
many years. Furthermore, the movement of the slidable ceramic disk
in response to each rotational displacement of the stem of the
valve can be achieved with the same relatively small torsional
force applied to the stem and will not require the unusual and
uneven torsional forces usually required in conventional valves to
control such valves when they are to be opened or closed.
The two ceramic disks employed in and characteristic of this
invention are enclosed in a common casing or cartridge and are
expected to be used together for a very long time, perhaps twenty
years, without requiring any re-adjustment or any maintenance
service or any replacement of any of the parts. On the other hand,
should a replacement or repair become necessary, the entire valve
structure may be perfected merely by replacing the cartridge. This
may be done by almost any unskilled person, so that the need for a
plumber to make the valve replacement or repair will be
unnecessary.
This invention, together with its objects and features, will be
better and more clearly understood from the following more detailed
description and explanation hereinafter following when read in
connection with the accompanying drawing in which:
FIG. 1 illustrates an exploded view of the structure of the
cartridge of the control valve mechanism of this invention;
FIG. 2 shows a perspective view of the structure of the general
arrangement of this invention, this figure showing also an exploded
view of the left end portion of the faucet;
FIG. 3 illustrates a front elevational view of the general
arrangement of this invention, this figure also illustrating, in
cross-section, part of the control valve structure;
FIGS. 4, 5, 6 and 7 illustrate schematically four different views
of the two ceramic disk members corresponding to different angular
positions of the movable ceramic disk member;
FIG. 8 shows a cross-sectional view of the two ceramic disk members
taken along the line A--A of FIG. 7;
FIG. 9 illustrates two curves generally representing the respective
forces required to manipulate the handle of a conventional faucet
valve subjected to different pressures of the incoming water, and
the handle of a faucet of the kind involved in the present
invention and subjected to similar forces; and
FIG. 10 illustrates two curves comparing the flow rates of the
conventional valve with the valve of this invention for different
angular rotations of the handles of the respective faucet
valves.
The same or similar reference characters will be employed
throughout the drawing to designate the same or similar parts
wherever they may occur in the drawing.
Referring generally to the drawing and especially to FIGS. 1 and 2
of the drawing which illustrate exploded representations of the
control valve mechanism of this invention, and referring also to
FIG. 3, the reference character CTG designates a cartridge which
houses the two substantially parallel contiguous ceramic disks or
elements DS1 and DS2 employed in this invention. The upper ceramic
disk DS1 is rotatable about its center or axis and, in its
rotation, is always slidable along the upper surface of the lower
ceramic disk DS2 which is and remains always stationary and
immovable and is always held stationary and immovable. The upper
disk DS1 is mounted within and held by projections SP1 and SP2
which are part of and integral with the structure of stem ST so
that the upper disk DS1 is rotatable and slidable about its central
or vertical axis. When the stem ST is rotated through any angular
displacement for effecting a change in the flow rate through the
control valve, the stem ST will necessarily rotate both the upper
disk DS1 and the stem projections SP1 and SP2 which retain the
upper disk SD1, through an equal and corresponding angular distance
without causing the lower disk DS2 to be rotated or otherwise moved
or changed in its position. Inasmuch as a sliding motion alone is
involved between the two disks, the spacing between the two disks
DS1 and DS2 will nevertheless remain unchanged throughout the
sliding motion. The two disks DS1 and DS2 will be maintained in
constant contact with each other although the upper disk DS1 may be
rotated and slid into different angular configurations by various
and different rotations of stem ST. The stem ST and disks DS1 and
DS2 may be considered to have a common axis, but only the stem ST
and the upper disk DS1 are revolvable, and they are revolvable as a
unit through the same angle about the common axis by any rotation
of the stem ST.
The lower disk DS2 is held fixed and immovable, both rotationally
and axially or laterally, within the cartridge body BD by the
rather wide projections PJ1 and PJ2 of disk DS2, the latter
projections being held between the pairs of guiding projections GP1
and GP2 (see FIG. 1) on the inner wall of the cartridge body BD, as
will be later explained. The lower disk DS2 is retained against
downward displacement or movement by a cap CP which has two
substantially equal openings CO1 and CO2 for water inflow and
outflow, respectively. These openings CO1 and CO2 in cap CP are
aligned with two corresponding counterbores CB1 and DO2 in the
lower or stationary disk DS2 (see FIG. 1). The cap CP also embraces
and supports two equal cylindrical seal rings SR1 and SR2 which may
be made of any forms of elastomer or rubber-like materials and, as
may be seen in FIGS. 1 and 3, they are sufficiently long so as to
enter into, and be retained by, the two respective counterbores in
the lower ceramic disk DS2.
The cap CP is positioned above the base nut BN which may be
positioned immediately beneath the support SB which may be, for
example, the platform of a kitchen sink, as shown in FIG. 2. An
escutcheon ES serves as a trimming mounted above and about the base
nut BN, as shown, the escutcheon ES also having aesthetic
value.
A water inlet passageway IT and a water outlet passageway OT may be
aligned with each other somewhat as illustrated in FIG. 3. These
passageways IT and OT have neck portions TN1 and TN2. Water
entering inlet tube or passageway IT will travel upward through the
valve mechanism to the cavity in the upper disk DS1, then return
via a down path in the valve mechanism, and then traverse the
outlet tube or passageway OT to be exited by the faucet spout FT.
The upper disk DS1 significantly has a fluid cavity but no fluid
aperture or through passage.
It will be observed that each of the cylindrical seal rings SR1 and
SR2 has a diameter which is appreciably greater than the opening of
each of the neck portions TN1 and TN2 of passageways IT and OT,
respectively. Moreover, the rings SR1 and SR2 are longer than the
overall vertical lengths of the two corresponding openings CO1 and
CO2 of the CP and the respective counterbores CB1 and CB2 of lower
disk DS2, as may be apparent from FIG. 3. Because of this
significant geometry of the indicated components, any expected
changes in the sizes of the elastomer rings SR1 and SR2 due to even
wide temperature changes will not expand rings SR1 and SR2 so as to
reduce or otherwise affect the rate of flow of water through either
of the passageways IT or OT. Thus, the flow of water will be
maintained rather completely independent of changes of the size of
the elastomer rings SR1 and SR2 over any very wide temperature
range that may be encountered in every day use of the valve
mechanisms.
The base nut BN has an internally threaded section BTH above which
may be applied a flat washer WS1. The nut BN and washer WS1 would
be normally positioned beneath the support body SB. The internal
threads BTH of nut BN would be joined to the external threads of
the inlet supply shank 1SS. The shank 1SS will be coupled to the
inlet water supply pipe SP as shown (see FIG. 3). The base nut BN
may be rotated about the externally threaded segment of the shank
1SS so as to apply pressure between the base nut BN and the support
SB through the washer WS1 to hold the base nut BN in a permanently
stationary position and thereby hold the faucet against upward
movement.
As shown in FIG. 2, a handle HN is mounted upon the stem ST and is
affixed to the stem ST by a simple screw SC which is threaded into
the upper serrated end of the stem ST. The opening within the
handle HN will be brought down almost to the upper surface of
escutcheon ES, as seen at the right of FIG. 3.
By rotating the handle HN in one direction or the other, the stem
ST will be rotated through a corresponding angle to slidably rotate
the upper disk DS1 on and about the upper surface of the lower disk
DS2 without changing the spacing, and without affecting the
intimate contact, between the disks DS1 and DS2. In other words,
the ceramic disks DS1 and DS2 remain in firm contact with each
other and the upper disk DS1 remains in slidable contact with the
lower disk DS2 even though the upper disk DS1 is rotated to enlarge
or reduce the effective sizes of the portal openings within the
lower or stationary disk DS2, as may be desired, through which
water may enter via the inlet IT and exit through the outlet OT to
the faucet spout FT. In still other words, the rotation of the
handle HN simply produces a rotational movement of the stem ST
without changing the longitudinal position of the handle HN and
without translatory movement of the stem ST and without changing
the longitudinal position of the movable upper disk DS1 with
respect to the stationary disk DS2. There is, therefore, no
longitudinal movement of any of the parts of the cartridge CTG at
any time, even while the volume flow rate of water is changed from
time to time as desired by the user. A further feature is the
continuous upward pressure exerted by the incoming water against
the inner wall of the lower stationary disk DS2 acting to firmly
hold the lower disk DS2 sealed against the upper disk DS1 while
allowing the disk DS2 to be held stationary and allowing the upper
disk DS1 to be rotated and slid, as often as desired, over the
surface of the lower disk DS2 by rotation of the handle HN and of
the stem ST by the user.
A washer WS2 (see FIG. 1) is mounted about stem ST above the
shoulders or projections SP1 and SP2 of the stem ST and within the
inner wall of the body BD of the cartridge CTG. This washer WS2 is
preferably made of Teflon or a like material which will have a
sufficiently low coefficient of friction so as not to retard or
otherwise interfere with the rotary action of the stem ST when the
handle HN is manipulated to change the flow rate. The washer WS2
serves as a thrust washer to prevent the upward movement of the
stem ST in response to the pressure of the water received through
the water inlet IT as the water travels through the two apertures
of the lower disk DS2 and through the stepped cavity of the upper
disk DS1 to be emitted by outlet OT (see FIG. 2).
As already explained, FIG. 1 shows the exploded view of the
components of the cartridge CTG with the handle HN of the valve
removed. The two retaining screws RS serve to maintain the
cartridge CTG affixed to the faucet pad FP (see FIG. 2) in which
there are two internally threaded openings to receive the screws
RS. The threaded openings in pad FP serve to grip and hold the ends
of screws RS.
FIG. 2 shows the relative positions of the retaining screws RS with
respect to the cartridge CTG. When it is desired to remove the
cartridge CTG, it is only necessary to remove the screw SC from the
stem ST (within the handle HN) and then remove the two retaining
screws RS, whereupon the cartridge CTG may be easily and quickly
removed and replaced by another cartridge if this should be
desired.
When the platform or support SB of a fixture, such as a sink, is to
have the control valve installed, this can be easily accomplished
merely by applying the washer WS1 and the base nut BN on one side
of the support SB and joining the base nut to the external threads
of the inlet supply shank ISS. The water supply pipe SP may then be
coupled to the inlet supply shank ISS by means of a retaining or
coupling nut CN, as shown in FIG. 3.
FIGS. 4, 5, 6 and 7 are views looking at the underside of the
cartridge CTG, with the cap CP and the seal rings SR1 and SR2
removed. These views show the various openings of the inlet port
DO1 and outlet port DO2 as the stem ST may be rotated to certain
angular positions.
FIG. 4 shows the valve in its closed position, with wings SP1 and
SP2 that project from shoulder SS on stem ST abutting projections
GP1 and GP2 of body DB. It is noted that there is an appreciable
distance between the edge of the inlet port DO1 of lower disk DS2
and the edge of the stepped cavity STP in upper disk DS1 which has
no aperture or through passage for fluid transmission. Because the
inlet port DO1 of the lower disk DS2 is spaced from the stepped
cavity STP, no water can flow through the outlet port DO2.
FIG. 5 shows the shape of the port openings when the handle is
positioned to provide a very low rate of flow through the faucet
FT. The intersection of inlet port DO1 in the lower disk DS2 and
the stepped cavity STP in the upper disk DS1 form a geometric shape
that increases slowly and gradually during the first few degrees of
opening effected by a small rotation of stem ST near the
off-position. This provides "fine tuning" when low flow rates are
desired. This also inhibits water hammer when the stem ST is
returned to its closed position even when the handle HN is closed
quickly.
FIG. 6 shows the port openings when the valve is placed in a
"half-open" position. The inlet port DO1 in the lower disk DS2 is
approximately 50 percent open and the outlet port DO2 in the lower
disk DS2 is approximately 60 percent open. This throttling of the
outlet port DO2 in relationship to the throttling of the inlet port
DO1 in all partially open positions of the valve induces a back
pressure in the stepped cavity STP in the upper disk DS1. This back
pressure inhibits cavitation by reducing the number and size of
cavitation bubbles that form as the water at high velocity passes
through the inlet port DO1 into the cavity STP.
FIG. 7 depicts the valve in its fully open position. Note that both
the inlet port DO1 and the outlet port DO2 are completely open to
the stepped cavity STP and that the water cannot now be throttled
at either port. Therefore, it can be seen that, because the outlet
port DO2 is opened in conjunction with the inlet port DO1, this
will not reduce the flow rate of the water in the fully open
position of the cartridge CTG.
FIGS. 1 and 8 show the general contour of the steps in the
non-apertured cavity STP of the upper ceramic disk DS1. The steps
are five in number for illustration. The cavity STP within disk DS1
is bounded by the several steps therein and is part of the fluidic
interconnection path for water received from the inlet conduit IT
and transmitted through the outlet conduit OT. The sizes of the
openings made available for water flowing into and out of the
stepped region STP will be determined only by the angular
displacement of the upper ceramic disk DS1. The space within the
stepped cavity STP may be completely cut off from the inlet conduit
IT merely by rotating the stem ST to one of its two extreme
positions (see FIG. 4). On the other hand, coupling space within
cavity STP will be brought to its greatest size when the stem ST is
rotated about its axis to its other or opposite extreme position
(FIG. 7).
The cavity embodying the five steps in the stepped region STP
serves to provide a conduit between the inlet passageway IP and the
outlet passageway OP (see FIG. 2) and the steps in the cavity also
provide ridges for the substantial reduction or elimination of
noise. It is a well known fact that cavitation will occur when the
velocity of a liquid is raised sufficiently high so as to cause the
pressure to drop to a very low level - a level approximating the
vapor pressure of the liquid. Any substantial decrease in pressure
often causes air bubbles to be formed and the bubbles grow in size
until they reach a fluid zone of higher pressure. The developed
higher pressure may be sufficient to burst the bubbles. The sudden
collapse of the bubbles generates an undesirable but quite distinct
audible noise. The edges of the ridges project into the fluid
stream carrying the bubbles and act to divide or distribute the
bubbles. The sharp ridges within cavity STP may cause the bubbles
to be reduced in size or broken up. Hence, those bubbles that are
not broken up are neverthesless prevented from growing large enough
to cause excessive noise.
FIG. 8 shows an enlarged cross-sectional view of the two disks DS1
and DS2, especially magnifying the ridged region of the upper
ceramic disk DS1. Each ridge may be regarded as having two
semi-circular segments (see FIG. 7). Each segment includes parts of
the several ridges and they have a common center as shown. Other
parts of the ridges have a like common center. The line joining the
two centers of the ridged section is pitched at an angle, such as
21.degree., with respect the normal vertical line as shown in FIG.
4. The two inner circular openings DO1 and DO2 of the lower disk
DS2 provide the through paths for water flow. Water entering
opening DO1 reaches the ridged cavity arena STP of the upper disk
DS1, then turns around within the cavity of the upper disk DS1 and
returns through opening DO2.
Two valves may be arranged on a sink or lavatory organized so that
one of the inlet shanks IS1 may receive hot water and the other
inlet shank (not shown) may receive cold water. The two outlet
passageways OP may be connected by conduit OT to the faucet spout
FT, as shown in FIG. 2, to receive and discharge both outputs as
water of an intermediate temperature. The intermediate temperature
will, of course, be fixed by the adjustments of the handles of the
two valves.
While each control valve has been shown and described as having a
lever handle HN to control the movement of its stem ST, the handle
may be a circular handle or any other means for rotating the
associated stem ST.
FIG. 9 presents a chart that shows the torques needed to operate
the handle HN of the valve of the disclosed invention as compared
to that needed to operate the handle of a conventional
compression-type faucet valve. The torques needed to turn the
handle HN are compared at the various inlet supply pressures that
are commonly found in this country, the range extending from about
20 psi to about 120 psi. The marked lesser force required to adjust
the valve of this invention will be readily apparent. The lesser
required forces render the device of this invention operable by
childrem as well as older or infirm people with equal facility.
This is a distinct improvement. rapidly
FIG. 10 illustrates two curves drawn to compare a conventional
valve with the valve of this invention as to the volume flow rate
(in g.p.m.) with respect to the angular rotation of the handle HN
of the valve from its "off" position. It will be readily apparent
that the valve of this invention, when opened to start its flow,
transmits water at a much slower rate of volume growth (see the
dotted curve), but that the growth rate rises much more radpily as
the angular displacement is increased. Hence a finer control is
obtained at the lower flow rates. This makes it easier for the user
to select lower flow rates.
Both FIGS. 9 and 10 exemplify the surprisingly large advantages of
the valve of this invention over conventional valve structures
heretofore employed in plumbing fixtures.
The disks DS1 and DS2 are preferably made of an alumina ceramic
material because such material has dimensional stability and its
surfaces can be ground and polished to such a degree of flatness
and smoothness that a liquid cannot pass between the contiguous
surfaces. To effect the seal between the contiguous surfaces, a
predetermined minimum contact pressure should be maintained to hold
the surfaces in continuous abutting relationship even if one of the
disks is to be slid over the surface of the other disk. The contact
pressure is achieved without springs.
To effect the required seal, the seal rings SR1 and SR2 are made
longer than the height of the apertures CO1 and CO2 within the cap
CP that support the rings (see FIG. 1), so that the upper portions
of rings SR1 and SR2 protrude into the enlarged cavities CB1 and
CB2, respectively, of the stationary disk DS2. Because of their
lengths as already noted, the rings SR1 and SR2 will therefore be
compressed, thereby exerting a continuous upward force against disk
DS2. The upward force will hold the two disks together.
The seal of the mating surfaces of disks DS1 and DS2 remains
effective continuously and is virtually independent of the inlet
water pressure, however high or low it may be. Because of the low
coefficient of friction between disks DS1 and DS2 and because of
the presence of the Teflon washer WS2, the amount of torque
required to operate the valve remains quite low even when the water
pressure is relatively high.
Because of dimensional stability of the alumina ceramic disks, the
handle HN may be moved to a desired position at different times and
the volume of water flow through the valve will remain unchanged,
notwithstanding changes in temperature of the fluid or in the
environment or in the time intervals between the successive valve
operations. The valve can therefore be rapidly brought to a
position corresponding to a desired flow rate at any time. The
valve may therefore be adjusted to a desired flow rate quickly and
easily.
Because the ceramic disks DS1 and DS2 are harder than sand and
other foreign materials found in water systems, the surfaces of the
disks remain smooth and unscratched by foreign particles and are
preserved in sealing, leak-proof condition for long periods of
time. The intimate contact between such flat, highly polished
surfaces precludes foreign matter from reaching the surfaces in
contact with each other.
The valve cartridge CTG is self-contained and is easily replaceable
by the homeowner without encountering the difficult problems
usually facing the homeowner in repairing a conventional faucet.
The faucet becomes operative anew immediately upon the replacement
of the cartridge.
The disks DS1 and DS2 have been described as made of alumina
ceramic materials. Such materials are preferred for the disk
devices. The disk devices are readily made of such materials in
large quantities and at relatively low cost, and their shapes can
readily conform to precise dimensions. Such materials can be highly
polished to provide easily slidable surfaces presenting minimal
resistances. When so polished, leakage of water between adjacent
disks becomes virtually nonexistant. However, other hard materials
may be used in place of alumina ceramics. For example, metals such
as stellite or tungsten carbides may be used for the disks, but
such hard materials would be more costly to manufacture and,
moreover, they do not provide the hardness and protection against
sand particles conveyed by the water.
A Williams Pat. No. 3,009,679 issued Nov. 21, 1961, discloses a
valve structure having, among other things, a valve seat of a
graphite composition positioned on a water inlet passage, an O-ring
mounted around the circumference of the valve seat to seal the
valve seat from the inlet passage, a hard valve member rotatably
mounted on the valve seat and affixed to a rotatable valve stem,
and a spring seated on a shoulder within the inlet passage and
pressuring the bottom of the valve seat against the valve member.
The valve member embodies an eccentric port which may be aligned
with another port in the valve seat. By rotating the valve stem,
the ports are brought into alignment or registry or out of
alignment or registry to control the flow rate through the valve.
This structure with its O-rings, its through ports in the adjacent
valve seat and valve member, its biasing spring, etc., constitute a
complicated valve of lesser value in manufacturing, maintenance and
operating features than the simple distinctive cartridge valve of
the present invention.
* * * * *