U.S. patent application number 15/678317 was filed with the patent office on 2017-11-30 for thrust plate for butterfly valve.
The applicant listed for this patent is Hamilton Sundstrand Corporation. Invention is credited to Timothy R. Boysen, Keith J. Brooky, John M. Dehais, Peter J. Dowd, Aaron T. Nardi, Kevin M. Rankin, Blair A. Smith.
Application Number | 20170343113 15/678317 |
Document ID | / |
Family ID | 46477686 |
Filed Date | 2017-11-30 |
United States Patent
Application |
20170343113 |
Kind Code |
A1 |
Dowd; Peter J. ; et
al. |
November 30, 2017 |
THRUST PLATE FOR BUTTERFLY VALVE
Abstract
A thrust plate for a butterfly valve includes a thrust plate
body that defines a recess that extends between a bottom thrust
surface, side walls, and an open top. There is a nickel-based or
cobalt-based wear-resistant coating located on the bottom thrust
surface. The wear-resistant coating is harder than the thrust plate
body.
Inventors: |
Dowd; Peter J.; (Granby,
CT) ; Dehais; John M.; (Windsor, CT) ; Smith;
Blair A.; (South Windsor, CT) ; Boysen; Timothy
R.; (Simsbury, CT) ; Brooky; Keith J.;
(Wallingford, CT) ; Nardi; Aaron T.; (East Granby,
CT) ; Rankin; Kevin M.; (Windsor, CT) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Hamilton Sundstrand Corporation |
Windsor Locks |
CT |
US |
|
|
Family ID: |
46477686 |
Appl. No.: |
15/678317 |
Filed: |
August 16, 2017 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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13007850 |
Jan 17, 2011 |
|
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15678317 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F16K 27/0218 20130101;
Y10T 29/49412 20150115; F16K 1/225 20130101; F16K 1/22
20130101 |
International
Class: |
F16K 1/22 20060101
F16K001/22 |
Claims
1. A thrust plate for a butterfly valve, the thrust plate
comprising: a thrust plate body defining a recess that extends
between a bottom thrust surface, side walls, and an open top; and a
nickel-based or cobalt-based wear-resistant coating located on the
bottom thrust surface, the wear-resistant coating being harder than
the thrust plate body.
2. The thrust plate as recited in claim 1, wherein the
wear-resistant coating is a nickel-based alloy.
3. The thrust plate as recited in claim 1, wherein the
wear-resistant coating includes chromium boride.
4. The thrust plate as recited in claim 1, wherein the
wear-resistant coating includes chromium carbide.
5. The thrust plate as recited in claim 1, wherein the thrust plate
body is stainless steel.
6. The thrust plate as recited in claim 5, wherein a ratio of a
hardness of the wear-resistant coating to a hardness of the
stainless steel is at least 2.3.
7. The thrust plate as recited in claim 6, wherein the recess
defines a recess diameter (RD1) and the wear-resistant coating
defines an average coating thickness (CT), and ratio RD1/CT is
between 33.2 and 56.67.
8. The thrust plate as recited in claim 7, wherein the recess
defines a recess depth (RD2) and the wear-resistant coating defines
an average coating thickness (CT), and a ratio RD2/CT is between 5
and 10.33.
9. The thrust plate as recited in claim 8, wherein the thrust plate
body, with the exception of the bottom thrust surface, is free of
the wear-resistant coating.
10. The thrust plate as recited in claim 1, wherein the thrust
plate body is a material selected from a group consisting of
nickel-based alloy, cobalt-based alloy and steel, and the
wear-resistant coating is a nickel-based alloy.
11. A butterfly valve comprising: a valve housing defining a flow
passage there through; a shaft extending in the valve housing and
including a butterfly disk mounted thereon within the flow passage;
a thrust plate including a thrust plate body defining a recess that
receives an end of the shaft, and the recess extends between a
bottom thrust surface, side walls, and an open top; and a
wear-resistant coating located on the bottom thrust surface.
12. The butterfly valve as recited in claim 11, wherein the
wear-resistant coating consists essentially of 0.5-1.0 wt. %
carbon, 12-18 wt. % chromium, 2.5-4.5 wt. % boron, 3.5-5.5 wt. %
silicon, 3.5-5.5 wt. % iron, up to 0.2 wt. % cobalt, and a
remainder of nickel
13. The butterfly valve as recited in claim 11, wherein the thrust
plate body is stainless steel.
14. The butterfly valve as recited in claim 13, wherein a ratio of
a hardness of the wear-resistant coating to a hardness of the
stainless steel is at least 2.3.
15. The butterfly valve as recited in claim 14, wherein the recess
defines a recess diameter (RD1) and the wear-resistant coating
defines an average coating thickness (CT), and ratio RD1/CT is
between 33.2 and 56.67.
16. The butterfly valve as recited in claim 15, wherein the recess
defines a recess depth (RD2) and the wear-resistant coating defines
an average coating thickness (CT), and a ratio RD2/CT is between 5
and 10.33.
17. The butterfly valve as recited in claim 16, wherein the thrust
plate body, with the exception of the bottom thrust surface, is
free of the wear-resistant coating.
18. The butterfly valve as recited in claim 11, wherein the flow
passage defines a central axis, and a long axis of the shaft is
non-perpendicular to the central axis.
19. The butterfly valve as recited in claim 11, wherein the recess
defines a recess diameter (RD1) and a recess depth (RD2) and the
wear-resistant coating defines an average coating thickness (CT)
such that a ratio RD1/CT is between 33.2 and 56.67 and a ratio
RD2/CT is between 5 and 10.33.
20. A method of installing a thrust plate on a butterfly valve, the
method comprising: securing a thrust plate to a valve housing that
defines a flow passage there through such that an end of a shaft,
which extends within the valve housing and includes a butterfly
disk mounted thereon, is received into a recess of the thrust plate
body, the recess extends between a bottom thrust surface, side
walls, and an open top, and the bottom thrust surface includes a
wear-resistant coating thereon.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application is a continuation U.S. application Ser. No.
13/007,850 filed on Jan. 17, 2011.
BACKGROUND
[0002] This disclosure relates to a butterfly valve having a
wear-resistant coating.
[0003] Butterfly valves are known and used to control air flow. A
typical butterfly valve includes a housing that defines an air flow
passage. A shaft is mounted in a housing and supports a butterfly
disk. An actuator rotates the shaft to selectively open or close
the butterfly disk to control the air flow through the passage in
the housing.
SUMMARY
[0004] A thrust plate for a butterfly valve according to an example
of the present disclosure includes a thrust plate body that defines
a recess that extends between a bottom thrust surface, side walls,
and an open top. A nickel-based or cobalt-based wear-resistant
coating is located on the bottom thrust surface. The wear-resistant
coating is harder than the thrust plate body.
[0005] In a further embodiment of any of the foregoing embodiments,
the wear-resistant coating is a nickel-based alloy.
[0006] In a further embodiment of any of the foregoing embodiments,
the wear-resistant coating includes chromium boride.
[0007] In a further embodiment of any of the foregoing embodiments,
the wear-resistant coating includes chromium carbide.
[0008] In a further embodiment of any of the foregoing embodiments,
the thrust plate body is stainless steel.
[0009] In a further embodiment of any of the foregoing embodiments,
a ratio of a hardness of the wear-resistant coating to a hardness
of the stainless steel is at least 2.3.
[0010] In a further embodiment of any of the foregoing embodiments,
the recess defines a recess diameter (RD1) and the wear-resistant
coating defines an average coating thickness (CT), and ratio RD1/CT
is between 33.2 and 56.67.
[0011] In a further embodiment of any of the foregoing embodiments,
the recess defines a recess depth (RD2) and the wear-resistant
coating defines an average coating thickness (CT), and a ratio
RD2/CT is between 5 and 10.33.
[0012] In a further embodiment of any of the foregoing embodiments,
the thrust plate body, with the exception of the bottom thrust
surface, is free of the wear-resistant coating.
[0013] In a further embodiment of any of the foregoing embodiments,
the thrust plate body is a material selected from a group
consisting of nickel-based alloy, cobalt-based alloy and steel, and
the wear-resistant coating is a nickel-based alloy.
[0014] A butterfly valve according to an example of the present
disclosure includes a valve housing that defines a flow passage
there through, a shaft that extends in the valve housing, and gas a
butterfly disk mounted thereon within the flow passage. A thrust
plate includes a thrust plate body that defines a recess that
receives an end of the shaft. The recess extends between a bottom
thrust surface, side walls, and an open top. A wear-resistant
coating is located on the bottom thrust surface.
[0015] In a further embodiment of any of the foregoing embodiments,
the wear-resistant coating consists essentially of 0.5-1.0 wt. %
carbon, 12-18 wt. % chromium, 2.5-4.5 wt. % boron, 3.5-5.5 wt. %
silicon, 3.5-5.5 wt. % iron, up to 0.2 wt. % cobalt, and a
remainder of nickel
[0016] In a further embodiment of any of the foregoing embodiments,
the thrust plate body is stainless steel.
[0017] In a further embodiment of any of the foregoing embodiments,
a ratio of a hardness of the wear-resistant coating to a hardness
of the stainless steel is at least 2.3.
[0018] In a further embodiment of any of the foregoing embodiments,
the recess defines a recess diameter (RD1) and the wear-resistant
coating defines an average coating thickness (CT), and ratio RD1/CT
is between 33.2 and 56.67.
[0019] In a further embodiment of any of the foregoing embodiments,
the recess defines a recess depth (RD2) and the wear-resistant
coating defines an average coating thickness (CT), and a ratio
RD2/CT is between 5 and 10.33.
[0020] In a further embodiment of any of the foregoing embodiments,
the thrust plate body, with the exception of the bottom thrust
surface, is free of the wear-resistant coating.
[0021] In a further embodiment of any of the foregoing embodiments,
the flow passage defines a central axis, and a long axis of the
shaft is non-perpendicular to the central axis.
[0022] In a further embodiment of any of the foregoing embodiments,
the recess defines a recess diameter (RD1) and a recess depth (RD2)
and the wear-resistant coating defines an average coating thickness
(CT) such that a ratio RD1/CT is between 33.2 and 56.67 and a ratio
RD2/CT is between 5 and 10.33.
[0023] A method of installing a thrust plate on a butterfly valve
according to an example of the present disclosure includes securing
a thrust plate to a valve housing that defines a flow passage there
through such that an end of a shaft, which extends within the valve
housing and includes a butterfly disk mounted thereon, is received
into a recess of the thrust plate body. The recess extends between
a bottom thrust surface, side walls and an open top. The bottom
thrust surface includes a wear-resistant coating thereon.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The various features and advantages of the disclosed
examples will become apparent to those skilled in the art from the
following detailed description. The drawings that accompany the
detailed description can be briefly described as follows.
[0025] FIG. 1 illustrates an example aircraft that includes an air
management system.
[0026] FIG. 2 is an isolated view of a thrust plate within a valve
of the air management system.
[0027] FIG. 3 is another view of the thrust plate of FIG. 2.
[0028] FIG. 4 is a cross-sectional view of the thrust plate shown
in FIG. 3.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0029] FIG. 1 illustrates selected portions of an example aircraft
10 that includes an air management system 12 mounted to a support
14 within the aircraft 10. The example air management system 12
includes a conduit 16 that defines a flow passage 18 along a
central axis A for air flow.
[0030] A valve assembly 20 controls air flow through the flow
passage 18. The valve assembly 20 includes a valve housing 21 that
defines at least a portion of the flow passage 18. A butterfly disk
22 is mounted on a shaft 24 within the valve housing 21, and an
actuator 26 (e.g., a pneumatic actuator) is operatively connected
to the shaft 24 to move the butterfly disk 22 about a long axis 28
of the shaft 24. The shaft 24 includes an axial end 30 that is
supported by a thrust plate 32. The thrust plate 32 limits movement
of the shaft along the long axis 28.
[0031] The air management system 12 is required to operate at
elevated temperatures, such as 1200.degree. F. (649.degree. C.),
and high vibration levels with little or no lubrication.
Furthermore, the long axis 28 of the shaft 24 is non-perpendicular
to the central axis A and thereby produces a thrust load along the
long axis 28 (indicated at 34). As will be described, the example
thrust plate 32 includes a wear-resistant coating 40 at the
interface with the axial end 30 of the shaft 24, to facilitate a
reduction in friction and wear from the thrust load 34 that the
shaft 24 exerts on the thrust plate 32.
[0032] Referring to FIGS. 2-4, the thrust plate 32 is formed from a
thrust plate body 42 that defines a recess 44 therein. The recess
44 generally extends between a bottom thrust surface 46, side walls
48 and an open top 50. As shown in FIG. 1, the axial end 30 of the
shaft 24 is received into the recess 44 such that the axial end 30
contacts the bottom thrust surface 46. In that regard, the thrust
plate body 42 includes a wear-resistant coating 40 on the bottom
thrust surface 46 to resist wear between the thrust plate body 42
and the shaft 24 from the thrust load 34 produced during operation
of the valve assembly 20.
[0033] In the example shown in FIG. 4, the recess 44 defines a
recess diameter (RD1) and a recess depth (RD2). The recess depth
extends between the bottom thrust surface 46 and a plane that is
defined by a ledge or step 51 in the recess 44. In this example,
the recess depth is taken from the lower portion of the step 51 at
the location where the recess 44 narrows to the recess
diameter.
[0034] The wear-resistant coating 40 also defines an average
coating thickness (CT). For instance, the average coating thickness
may be an average of thicknesses taken at selected locations across
the wear-resistant coating 40.
[0035] In embodiments, the recess diameter (RD1) is 0.830-0.850
inches and may nominally be 0.840 inches. The recess depth (RD2) is
0.125-0.155 inches and may nominally be 0.140 inches. The coating
thickness (CT) is 0.015-0.025 inches and may nominally be 0.020
inches.
[0036] In embodiments, the thrust plate 32 and wear-resistant
coating 40 are designed with a ratio of RD1/CT that is between 33.2
and 56.67. In a further embodiment, the thrust plate 32 and
wear-resistant coating 40 are also designed with a ratio of RD2/CT
that is between 5 and 10.33. The selected ratios ensure that the
wear-resistant coating 40 has a sufficient thickness to provide
wear-resistance for a given recess size and also ensure that the
wear-resistant coating 40 provides the proper axial positioning of
the shaft 24.
[0037] The wear-resistant coating 40 is designed to be harder than
the material of the thrust plate body 42 to thereby provide the
wear-resistance. As an example, the material of the thrust plate
body 42 may be an austenitic or precipitation hardened stainless
steel. In other embodiments, the material of the thrust plate body
42 may be a nickel-based alloy, a cobalt-based alloy or steel. The
nickel-based alloy may be Inconel.RTM. 625 or 718, the cobalt-based
alloy may be Haynes.RTM. 25, Stellite.RTM. 31 or Stellite.RTM. 60.
The element that is the base element of the alloy refers to that
element being present in a greater amount than any other element in
the composition.
[0038] The material of the wear-resistant coating 40 is designed to
protect the thrust plate body 42. In embodiments, the
wear-resistant coating 40 is a nickel-based alloy or a cobalt-based
alloy that is harder than the material of the thrust plate body 42.
As an example, the nickel-based alloy may have a composition that
essentially includes 0.5-1.0 wt. % carbon, 12-18 wt. % chromium,
2.5-4.5 wt. % boron, 3.5-5.5 wt. % silicon, 3.5-5.5 wt. % iron, up
to 0.2 wt. % cobalt, and a remainder of nickel. The alloys may
include impurities that do not affect the properties of the
material or elements that are unmeasured or undetectable in the
material.
[0039] The nickel-based alloy of the wear-resistant coating 40 may
include hard compounds or phases that contribute to the high
hardness of the wear-resistant coating 40. For instance, the hard
compounds or phases may include chromium boride, chromium carbide,
or both. The wear-resistant coating 40 may additionally include
silicides. The borides, carbides, and/or silicides may be formed
between the elements of the composition of the wear-resistant
coating 40.
[0040] The flow passage 18 of the valve assembly 20 defines a
diameter (D.sub.p) (FIG. 1) and the shaft 24 contacts the
wear-resistant coating 40 over an interface area (CA) (FIG. 4). A
ratio D.sub.p/CA determines the amount of thrust load 34 on the
bottom thrust surface 46 of the thrust plate 32. In embodiments,
the ratio D.sub.p/CA is between 8 and 12.
[0041] The relative hardness of the wear-resistant coating 40 in
comparison to the hardness of the material of the thrust plate body
42 is designed to provide a desired level of wear-resistance. For
instance, a ratio of the hardness of the wear-resistant coating 40
to the hardness of the material of the thrust plate body 42 is at
least 2.3. In a further example, the hardness of the wear-resistant
coating 40 may be at least 55 HRC and the hardness of the material
of the thrust plate body 42 may be a maximum of 23 HRC. The
wear-resistant coating 40 thereby provides a sufficient level of
wear-resistance with regard to the thrust load 34 that is expected
from the given ratio D.sub.p/CA.
[0042] The wear-resistant coating 40 resists wear such that during
the operation of the valve assembly 20, the shaft 24 and butterfly
disk 22 maintain a concentric position within the flow passage 18.
The shaft 24 and butterfly disk 22 therefore do not shift position
due to thrust plate 32 wear that could otherwise lead to binding
and hindering of valve operation. That is, the absence of the
wear-resistant coating 40 may otherwise lead to wear of the shaft
24 and/or of the bottom thrust surface 46 under the given thrust
load 34 such that the shaft 24 and butterfly disk 22 shift in
position and potentially hinder the operation of the valve.
[0043] Optionally, as shown in FIG. 1, the axial end 30 of the
shaft 24 may include a plug 52 that is mounted in the axial end 30
for contact with the wear-resistant coating 40. The plug 52 may be
formed of a hard material that resists wear.
[0044] In the illustrated example, the thrust plate 32 also
includes a plurality of mounts 52 for securing the thrust plate 32
to the valve housing 21. In embodiments, the thrust plate 32
includes three such mounts 52 that are uniformly spaced around the
periphery of the thrust plate 32. As an example, each of the mounts
52 includes an opening 54 therein for receiving a bolt 56 (FIG. 1)
to secure the thrust plate 32 to the valve housing 21.
[0045] Although a combination of features is shown in the
illustrated examples, not all of them need to be combined to
realize the benefits of various embodiments of this disclosure. In
other words, a system designed according to an embodiment of this
disclosure will not necessarily include all of the features shown
in any one of the Figures or all of the portions schematically
shown in the Figures. Moreover, selected features of one example
embodiment may be combined with selected features of other example
embodiments.
[0046] The preceding description is exemplary rather than limiting
in nature. Variations and modifications to the disclosed examples
may become apparent to those skilled in the art that do not
necessarily depart from the essence of this disclosure. The scope
of legal protection given to this disclosure can only be determined
by studying the following claims.
* * * * *