U.S. patent number 3,717,284 [Application Number 05/068,615] was granted by the patent office on 1973-02-20 for beverage dispensing valve.
Invention is credited to Bruce Garrard.
United States Patent |
3,717,284 |
Garrard |
February 20, 1973 |
BEVERAGE DISPENSING VALVE
Abstract
The specifications and drawings disclose a dual valve
combination for dispensing a soft drink beverage, including a water
valve and a syrup valve, each valve including a plunger which may
be operated by a pivoted handle simultaneously with the other
plunger or by separate manual operation when the handle is rotated
out of the way. Each plunger has a small O-ring that shuts flow off
when it seats in a small bore section of the valve body and allows
flow when it is moved into a larger cavity. Each plunger has a
small diameter O-ring portion and, because of a small movement of
the plunger after stopping the flow, creates a suction that draws
liquid back from its nozzle orifice. A water nozzle and syrup
nozzle control flow into a mixing nozzle with the water being
expelled in two circular, horizontal streams near the top of the
mixing nozzle and syrup being directed in a jet at a downward angle
into the center of the water stream leaving the mixing nozzle.
Inventors: |
Garrard; Bruce (Atlanta,
GA) |
Family
ID: |
22083661 |
Appl.
No.: |
05/068,615 |
Filed: |
September 1, 1970 |
Current U.S.
Class: |
222/108;
222/129.1; 222/547; 251/902 |
Current CPC
Class: |
B67D
1/005 (20130101); B67D 1/0083 (20130101); Y10S
251/902 (20130101) |
Current International
Class: |
B67D
1/00 (20060101); B67d 005/56 () |
Field of
Search: |
;222/129.1,108,144.5,145,518,571,547,564 ;137/607 ;251/DIG.3
;239/403,405,406,428 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Reeves; Robert R.
Assistant Examiner: Bartuska; Francis J.
Claims
I claim:
1. A valve for controlling fluid flow comprising a housing and
plunger combination, said housing having connecting means to a
source of supply at one end whereby said flow may enter said
housing, and exit means whereby said flow may leave said housing,
said plunger having a sealing ring groove and a sealing ring
therein and said housing having a small bore into which said
sealing ring moves and seals to stop flow when said plunger is
moved to its closed position, said housing having a first enlarged
cavity interposed between one end of said small bore and said fluid
supply end and into which said sealing ring is moved when said
plunger is moved to its open position, thereby allowing said flow
to occur, and having a second enlarged cavity adjacent to the other
end of said small bore and connecting to said exit means, said
plunger having an enlarged portion, which has ring seal means,
operable in a portion of said second enlarged cavity whereby the
movement of said enlarged portion away from said small bore during
the closing movement of said plunger, and after flow from said
fluid supply has been stopped by said closing action, causes a
suction that draws said fluid from said exit means into said second
enlarged cavity.
2. A valve as in claim 1 wherein a portion of said plunger is
within said small bore when said plunger is in said open position
and said flow occurs, there being a clearance area between said
plunger portion and said small bore, and wherein said flow passes
through said clearance area into said second enlarged cavity and
out through said exit means.
3. A valve for controlling fluid flow comprising a housing and
plunger combination, said housing having a small bore centrally
located, a first counterbore adjacent to one end of said small bore
and a second counterbore adjacent to the other end of said small
bore, said plunger having a small diameter portion moveable in said
small bore with clearance and with an O-ring near the end of said
small diameter portion, said plunger having a larger diameter
portion at the end opposite to said O-ring and slidably moveable in
said first counterbore, said large diameter portion having ring
seal means engaging the walls of said first counter bore said valve
being closed and a suction being created in said first counterbore
by movement of said plunger when said O-ring is moved into the end
of said small bore adjacent to said second counterbore and said
valve being open and allowing said fluid flow when said plunger is
moved in a direction that moves said O-ring out of said small bore
and into said second counterbore, said valve having fluid entrance
means connecting to said second counterbore and having exit means
connecting to said first counterbore, with flow proceeding from
said entrance means into said second counterbore, through said
small bore clearance and into said first counterbore to said exit
means when said valve is open.
4. A valve for controlling fluid flow comprising a housing and a
plunger operable in a longitudinal cavity in said housing, said
plunger having an end externally accessible at one end of said
housing for manually operating said plunger, fluid supply means
communicably connected with said cavity at the end of said housing
opposite to said one end of said housing, fluid exit means
communicably connected to said cavity and extending outward through
one wall of said housing, flow control means located within a first
portion of said cavity and operably by movement of said plunger in
one direction to open communication between said fluid supply means
and said fluid exit means and operable to close said communication
when said plunger is moved in the opposite of said one direction,
said plunger having ring seal means engaging a second portion of
said cavity and having overtravel movement in said second cavity
portion beyond that necessary to the closing of said flow control
means and said overtravel movement causing a negative displacement
in said second portion of said cavity, said second cavity portion
having communication with said fluid exit means and said fluid
being forced away from said exit means toward said second cavity
portion by the atmosphere as a result of said negative
displacement.
5. A valve for dispensing carbonated water comprising a housing
having entrance and exit means for said water, a restricted
passageway, a plunger operable to open and closed positions within
said housing, a compression spring biasing said plunger toward its
closed position, a valve seat in said housing, and a seating
element that engages said seat to stop water flow and which is
disengaged from said seat by movement of said plunger to its open
position, said restricted passageway being interposed between said
seat and said spring and said spring being aligned to receive the
discharged water from said passageway longitudinally into the
interior or said spring, said spring being compressed by the
opening movement of said plunger and thereby forming a further
restriction to the flow of said water outward through its coils to
said exit means, and whereby a positive gage pressure is maintained
inside said spring during said flow.
6. A means for dispensing carbonated water comprising a combination
of a valve having an open position and a closed position, a
restricted passageway, and a housing containing a partially
compressed spring, said housing being downstream from said valve,
and said restricted passageway being interposed between said valve
and said spring, said spring being aligned to receive the
discharged water from said passageway longitudinally into the
interior of said spring, the compression of said spring being
sufficient to cause a further restriction to the flow of said
carbonated water outward through the spring coils and thereby to
maintain a positive gage pressure inside said spring during said
flow, said housing having exit means for said flow adjacent to the
exterior of said spring.
Description
SUMMARY AND BACKGROUND
The overall object of the invention is to provide a dispensing
valve that is simple, compact, easy to service, easy to manufacture
and therefore inexpensive, and yet provides a number of unique
features, not found in previous soft drink dispensing valves.
The dispensing, or mixing, valve is actually composed of two
separate valves -- a water valve and a syrup valve -- which are
easily operated separately by one finger when the handle is rotated
out of the way or simultaneously when the handle is rotated in the
opposite direction. This is especially a useful feature in a home
dispenser where individuals may wish to doctor the ratio for a
sweeter or less sweet drink, or to obtain water or syrup separately
for use in other drinks. Previous valves have offered means for
obtaining carbonated water separately, but not syrup also, in
addition to the complete drink, the reason being that the water
valve normally requires so much force to operate that the handle
must be utilized and the design involves rotation of the handle in
one direction to operate both valves and rotation in the other
direction to operate the water valve alone, with no easy means to
operate the syrup valve separately.
In the proposed design the water valve is easy to operate because
of the unique plunger design, the use of teflon to reduce friction
and the use of a light spring bias, which is possible because of
the low friction. The plunger design is unique in its use of a
small O-ring that moves into a small bore in the valve body to stop
flow and out of the small bore into a larger bore to allow flow
through a small clearance between the small bore and the plunger.
The diameter at this section of the plunger is small
(three-sixteenth inch approx.) and the force to unseat the plunger
against a typical pressure of 100 psi acting on this cross section
is only 2.8 pounds.
Another important feature of the valve is the fact that the low
operating force makes it possible to operate the valve by manually
pushing a paper cup against a bracket extended down from the
handle. This bracket is made in whole or part of spring steel wire
and practically insures against accidental partial opening of the
valve, which could result in an improper water-syrup ratio. Once
the cup has been pushed hard enough to partially open the valve,
full opening takes place because of the stored energy in the spring
action. The only way a similar feature has been obtained previously
is through use of electric valves for water and syrup, both of
which are opened simultaneously by a cup-actuated switch, a far
more expensive answer than the one proposed here and not as readily
applied to portable uses.
The plunger design is also unique because of the ready-made means
it provides for a restriction in dispensing carbonated water. The
plunger body itself in the area of the O-ring valving portion acts
as a restrictor and, in addition, the return spring also acts as a
restrictor when it is almost fully compressed during a draw.
Neither of these features is found in previous designs.
The plunger design affords a further important feature by making
the valve easy to service from the front end of the valve whereas
previous designs have required the valve to be removed from its
mounting for servicing to replace a valve seat or clear it of an
impediment. This simplifies the design of the rear end of this
valve and its mounting, since the parts do not have to be removed
for normal servicing.
The plunger design is also unique, especially in its use in the
syrup valve, in providing a suction action that draws syrup away
from the end of the syrup nozzle when the valve closes. This is
effected by a small additional movement of the plunger after flow
has been stopped and prevents even one drop of syrup being left to
possibly affect the next draw, which might be carbonated (or plain)
water only. In previous valves carbonated (or plain) water drawn
immediately after syrup has been dispensed in the previous drink
noticeably discolored and flavored by a drop of syrup left on the
end of the syrup nozzle.
Also important to prevention of contamination of one drink by
residue from another are the design of the water nozzle and syrup
nozzle and their relation to the mixing nozzle, as well as the
simplicity of the mixing nozzle itself. The water nozzle causes
water to enter the mixing nozzle in two horizontal streams near the
top inside periphery on one side of the mixing nozzle, with the two
streams circling in opposite directions and meeting on the far side
of the nozzle where they counteract the swirling motion of each
other and combine to fall through the bottom exit from the mixing
nozzle. No baffles are required in the bottom of the mixing nozzle
to control the swirling motion found in some previous mixing nozzle
systems or to effect mixing of the syrup and water as required in
other previous designs. Effective mixing is achieved in this design
by the relation of the syrup nozzle to the stream of water leaving
the mixing nozzle. Elimination of the baffles normally found
contributes greatly to keeping the mixing nozzle clean. In addition
the water nozzle is higher than the syrup nozzle and causes a small
amount of water to leave the mixing nozzle last -- leaving the
nozzle clean for the next drink and virtually eliminating the usual
algae growth that has always required frequent cleaning of the
mixing nozzle in previous designs.
The body design is extremely compact, being only 11/2 .times. 3/4"
in cross section and 2 1/8 inch long in a preferred embodiment, and
is unique in its basic simplicity, which makes it easy to mold
using a suitable plastic material such as nylon or Delrin. The
basic design consists of two longitudinal holes arranged in a
rectangular block to give relatively constant wall thickness for
easy molding. Inserts are used to provide the small diameter
valving section of the separate bores. The transverse holes for the
water nozzle, syrup nozzle and the annular groove for the mixing
nozzle are provided by separate machining. A metal bracket attached
to the front of the body provides mounting for the handle as well
as being a retainer and stop for the plungers. Mounting of the
valve is easily provided by rear fittings that are suitably
threaded into the rear part of the longitudinal holes and seldom if
ever have to be removed since normal servicing is done from the
front of the valve.
BRIEF DESCRIPTION OF THE DRAWING
For a better understanding of the invention reference may be had to
the accompanying drawings, and the detailed description which
follows:
FIG. 1 is an enlarged front view of the valve with the handle
broken away partially and the bottom parts below the valve body
shown in section as viewed along line 1--1 in FIG. 2.
FIG. 2 is a section view taken along line 2--2 in FIG. 1.
FIG. 3 is a section view taken along line 3--3 in FIG. 1.
FIG. 4 is a section view taken along line 4-4 in FIG. 2.
FIG. 5 is a side elevation view showing the portion of syrup
plunger 19 that is different from the same portion of plunger 11 in
FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIG. 1, 10 is the main body of the valve, 11 is the water
plunger and 19 is the syrup plunger. 15 is the handle mounting
bracket, 16 is the handle and 17 the handle pin. 20 is water nozzle
with orifice 20a, and 21 is the syrup nozzle with orifice 21a. 22
is the mixing nozzle with O-ring 22a. In this view and in FIG. 3
the important relationships between the water nozzle, syrup nozzle
and mixing nozzle can be seen.
In FIG. 2 the valving action of the plunger and its relationship to
the other parts can be most clearly seen. In this view 10 is again
the main body with bore 12 and counterbore 12a extending the length
of body 10. 13 is a teflon insert pressed forward against the
shoulder between 12 and 12a. 13a is an O-ring. 11 is a stainless
steel water plunger and 11a is a teflon sleeve with O-ring 11c.
Plunger 11 is biased to the right by compression spring 14 and
retained by handle bracket 15, which is secured to body 10 by
machine screws 18. Handle 16 and plunger 11 are shown in the closed
position with O-ring 11b seated in bore 13b, and with the water
pressure and spring 14 biasing the shoulder 11f of the plunger
against the lower edge of handle bracket 15. At the left end of
FIG. 2 is shown fitting 23 which serves not only as an inlet for
the water but also, with nut 24, as a means of mounting the valve
to a bracket or through cabinet wall 25. The syrup side has a
similar fitting and nut. Also shown on the water side is restrictor
26 mounted in the end of fitting 23, where it serves a function to
be explained later, but is not required or desirable on the syrup
side.
In FIG. 4 may be seen the further relationship of U-shaped handle
16, U-shaped bracket 15 and pin 17.
Referring again to FIG. 2, when handle 16 is rotated clockwise it
presses against plunger 11 and moves it to the left to a fully
actuated position where shoulder 11d is stopped by the bottom of
handle bracket 15. This movement is enough to move O-ring 11b out
of seal contact with bore 13b and leaves the clearance between
plunger 11 and bore 13b open to the flow of water, which enters
through fitting 23 and restrictor 26. This clearance is small -- on
the order of 0.010 inch diameter wise -- and serves as a
restriction for dispensing carbonated water. For dispensing syrup
this restriction is not desirable and FIG. 5 shows how plunger 19
may be relieved to give additional clearance at 19a.
When the water leaves the right end of insert 13 it enters the
clearance area between plunger 11 and spring 14. From here it flows
through the clearance in the compressed turns of spring 14 to enter
bore 20b of water nozzle 20. This clearance can be controlled by
proper design of the pring as to the degree to which the spring is
compressed when the plunger is fully actuated so that it may be
large to allow free flow of syrup or small to restrict carbonated
water flow.
After entering bore 20b, the water flows through orifices 20a, as
seen in FIG. 3, striking the inner periphery of mixing nozzle 22 at
the two areas 22b, flowing around in opposite circular paths and
meeting at or near point 22c, where they counteract the circular
motion of each other, combining and falling then through the bottom
of mixing nozzle 22. The fact that the water leaving orifices 20a
strikes the areas 22b at an oblique angle is significant in helping
to preserve carbonation in the water. Orifice 20a is shown in FIG.
2 as if it were located along line 2--2 in FIG. 1. It is actually
offset as shown in FIG. 1 and FIG. 3 so that the oblique angle
mentioned above will be as large as possible.
At the same time that the water plunger was moved to its open
position, the syrup plunger 19, identical to water plunger 11
except for the relieved area 19a shown in FIG. 5, was also actuated
by handle 16, with syrup entering bore 21b of syrup orifice 21 in
FIG. 1 after following a similar path to the water through an
insert clearance area and through the turns of its spring. The
syrup then flows at a downward angle out of orifice 21a into the
center of the water stream at point 22d, where there is enough
turbulence, combined with the angular entry of the syrup stream, to
effectively mix the syrup and water, as they leave the bottom of
the mixing nozzle, to a point sufficient to insure the complete
mixing when they come to rest in the cup. When the valve is closed
by releasing handle 16 and allowing the plungers 11 and 19 to
return to the right the water and syrup flow stop simultaneously
from orifices 20a and 21b, but since water orifice 20a is higher
and expels water in a horizontal plane a small residue of clear
water at the height of 20a in FIG. 1 falls through the bottom area
of nozzle 22 last, leaving virtually no remnant of syrup or syrup
flavored water in the mixing nozzle to cause contamination of the
next drink or to support algae growth during slack draw periods.
This normally requires daily or frequent cleaning to maintain a
sanitary appearance. The action of the syrup plunger as it closes
also contributes to keeping the mixing nozzle clean by a suction
action that draws the syrup away from orifice 21a up into bore 21b
as shown in FIG. 1. In FIG. 2 it will be noted that the valve
plunger O-ring 11b has been moved to the right beyond the point
where it first seats at the mouth of bore 13b. With O-ring 11c and
the large plunger diameter at that point moving to the right after
O-ring 11b seats, it can be seen that a suction is created by
virtue of increasing the clearance volume in the area of spring 14
in bore 12 which draws the syrup upward as described. With the
usual valve, where such suction is not created, a convex drop of
syrup is normally left depending from the end of the syrup nozzle
to contaminate the next drink and to contribute to algae
growth.
It is evident in FIG. 2 that the handle 16 may be easily pivoted
counterclockwise 90.degree. or so to a more or less horizontal
position so that the water plunger 11 or syrup plunger 19 may be
actuated separately by thumb or finger to obtain water alone or
syrup. It is also evident that an additional bracket (not shown)
may be extended from the lower end of handle 16 below and to the
left of mixing nozzle 22 so that the handle may be actuated in a cw
direction around pin 17 by pushing a glass or paper cup against the
added bracket.
For each of the above features to be practical it is necessary for
the force required to actuate the plungers to be quite low, in
spite of the high water pressure normally found in carbonated water
systems. The unique design of the plunger in using an O-ring as the
valve means by moving the O-ring section into and out of a bored
hole makes this easy to accomplish. The effective diameter at this
point can easily be reduced to about 3/16" or 0.028 inches.sup.2 in
cross section. With 100 psi this requires only 2.8 pounds to
overcome. As soon as flow begins the pressure drops across
restrictor 26, reducing this force on plunger 11 further, although
there is a new force on sleeve 11a. However, because of an
additional pressure drop through the restrictive action at 13b this
force is low, so that the total force to hold plunger 11 open is
approximately equal to the force required to open it. Restrictor 26
has been found to be important to keep the actuating force low but
it can take other forms, such as a needle valve in the line
immediately before fitting 23, or a flow control of suitable design
similarly located. For the syrup side it has been found to be an
advantage to use an adjustable flow control in the line coming from
the syrup tank before the syrup is cooled and the viscosity
affected, which does not apply to water.
The fact that this design also makes the valve extremely easy to
service is seen in FIGS. 1 and 2 where it is evident that plunger
11 can be removed by simply removing one screw 18 on he left of
FIG. 1 and pivoting handle bracket 15 up enough to clear the
shoulder of plunger 11 and pulling 11 out. The use of teflon for
the plunger sleeve 11a effectively prevents wear in the bore 12 of
the body and the teflon insert 13 insures very long life for O-ring
11b, reducing service to a minimum.
The restriction at 13b of the insert and the use of spring 14 as a
second restrictor require no additional expense of note and provide
means for reducing the high pressure of carbonated water in two
more steps besides restrictor 26: (1) from area 12a to a lower
pressure in the area of spring 14 because of pressure loss through
the restriction at 13b; and (2) to still lower pressure in bore 20b
because of pressure loss through the turns of spring 14 when almost
fully compressed. With the final pressure drop from 20b to
atmosphere, the pressure of the carbonated water has actually been
reduced in four steps from 100 psi to atmosphere, more steps than
in any known previous valves and contributes to the high efficiency
of this valve in preserving carbonation, while the simplicity of
the means in each step renders the cost very low.
It might be pointed out that the restriction at 13b the restriction
provided by the compressed spring provide the major reduction in
pressure of the carbonated water to a point near atmospheric. As a
matter of fact, for dispensing carbonated water alone it has been
found that a simple tube can be substituted for water nozzle 20 in
FIG. 2 and carbonated water dispensed very efficiently by carefully
adjusting the degree to which spring 14 is compressed when the
valve is open. This can be easily done by use of shims at either
end of the spring. No mixing nozzle 22 is required in this case.
The combination of the restriction at 13b and that provided by
spring 14 appears to be ideal. Located downstream of the valve seat
portion of insert 13 the water is maintained at a relatively high
pressure in the turbulent area entering insert 13, insuring full
retention of gas at this point. The restricted passageway at 13b
causes the water to flow at high velocity through this area, and
the large area inside spring 14, which is filled with water during
a draw, serves as a cushion to absorb this high velocity water to
prevent it from striking any abutment directly, which would cause
undue loss of gas from solution. The spring is compressed to a
degree to insure a positive pressure in this area, during a draw,
several pounds per square inch above atmospheric and thus assures
that the area is full of water. The nature of the spring thus
affords an ideal means for receiving high velocity water in its
large inner area and further is ideal for the discharge of water to
a point at or near atmospheric pressure. It provides rounded entry
and rounded exit for the water passing through the turns and a very
elongated continuous spiral opening that appears to have great
advantage for this purpose. A study of other valves for dispensing
carbonated water reveals that the more successful ones have some
form of elongated or continuous opening for the final discharge to
atmospheric pressure and all of them provide specially manufactured
means for this purpose. The advantage and uniqueness of using a
simple standard item such as a compression spring for this purpose,
especially when it serves in addition as a bias means for the
plunger and as a cushioning area for high velocity water as well,
can thus be appreciated.
* * * * *