CA1281257C - Check valve - Google Patents
Check valveInfo
- Publication number
- CA1281257C CA1281257C CA 534994 CA534994A CA1281257C CA 1281257 C CA1281257 C CA 1281257C CA 534994 CA534994 CA 534994 CA 534994 A CA534994 A CA 534994A CA 1281257 C CA1281257 C CA 1281257C
- Authority
- CA
- Canada
- Prior art keywords
- ball
- insert
- check valve
- hardness
- valve according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/04—Check valves with guided rigid valve members shaped as balls
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/7904—Reciprocating valves
- Y10T137/7908—Weight biased
- Y10T137/7909—Valve body is the weight
- Y10T137/791—Ball valves
Abstract
ABSTRACT OF THE DISCLOSURE
In a subsurface positive displacement pump used in the petroleum industry for pumping crudes characterized by a high degree of suspended solid particles, a ball check valve comprising a valve ball and a valve seat assembly wherein the valve seat assembly comprises a hollow cylindrical body defining an orifice through which pumped fluid passes, the hollow cylindrical body being provided with a recess on the surface facing the valve ball in the region defining the orifice wherein an insert which forms the actual valve seat for the ball valve is secured in the recess. The insert is formed of a material having a hardness greater than the hardness of the material from which the cylindrical body is formed and the material from which the valve ball is formed is characterized by a high resiliency, a modulus of elasticity of between 0.1 x 106 psi to 15 x 106 psi and a hardness greater than that of the hollow cylindrical body.
In a subsurface positive displacement pump used in the petroleum industry for pumping crudes characterized by a high degree of suspended solid particles, a ball check valve comprising a valve ball and a valve seat assembly wherein the valve seat assembly comprises a hollow cylindrical body defining an orifice through which pumped fluid passes, the hollow cylindrical body being provided with a recess on the surface facing the valve ball in the region defining the orifice wherein an insert which forms the actual valve seat for the ball valve is secured in the recess. The insert is formed of a material having a hardness greater than the hardness of the material from which the cylindrical body is formed and the material from which the valve ball is formed is characterized by a high resiliency, a modulus of elasticity of between 0.1 x 106 psi to 15 x 106 psi and a hardness greater than that of the hollow cylindrical body.
Description
5~
I'he present invention relates to an improved check valve and, more particularly, an improved check valve for use in positive displacement subsurface pumps used in the petroleum industry for pumping crudes having a high degree of suspended solids.
Typical positive displacement pumps used in oil well pumping for pumping crudes employ check valves comprising a valve seat onto which a ball rests and seals against the seat. In a typical well pump, at least one check valve is located in the pump piston and a second check valve is positioned at the fluid inlet to the pump cylinder in which the piston is displaced so as to permit the flow of the pump fluid only in one direction. A typical valving arrangement of the kind discussed above is shown in U.S. Patent 4,018,547.
. ",. . .
~81X57 86-]46 When pumping heavy crudes characterized hy high contents of suspended solids there is a prohlem wi~h wear on t~e valve ball and the valve seat which limits the effec~ive life of the check valves. This wear is due to the effects of erosion caused by the suspended particles in the pumped fluid. In particular, as the valve ball moves closer to the valve seat, t~e velocity of the pumped fluid increases thereby increasing the likelihood of damage to the valve ball and valve seat by the suspended particles. When the valve ball and valve seat are damaged leakage of the pumped fluid will occur through the valve which results in a loss in volumetric efficiency of the pump and loss of production time when repair of the valve is necessary. Damage to the valve ball, while not desirable, is not as ~ritical as damage to the valve seat. When the valve ball is damaged leakage tends to be minimal as the likelihood of the valve ball, which freely rotates, to seal on the valve seat exactly at the point of damage is low. However, if the valve seat itself i8 damaged then leakage through the valve might tend to be continuous. By making the valve ball out of a material which is characterized by high resiliency, that is, a modulus of elasticity of between 0.1 x l06 psi to 15 x 10 psi, the valve ball will tend to rest on the valve seat by elastically ~8~57 deforming. Therefore, even damage to the valve seat would not allow for continuous leakage as was the case wlth the prior art.
Accordingly, the present invention seeks to provide a ball check valve for use in positive dis-placement subsurface pumps used in the petroleum industry for pumping crudes which is less susceptible to damage by impact and erosion due to suspended solids in the pumped fluid.
In particular the present invention seeks to provide a ball check valve wherein the valve seat comprises a hollow cylindrical body provided with an insert at the orifice of the body which forms the valve seat.
Still further the present invention seeks to provide a ball check valve as set forth above wherein the insert is formed of a material having a hardness greater than the hardness of the valve ball.
Still further the present invention seeks to provide a ball check valve as described above wherein the valve ball is formed of a material having a high resilience, a modulus of elasticity of between 0.1 x 106 psi to 15 x 106 psi and a surface hardness greater than the hardness of the hollow cylindrical body.
~ ~81~7 The present invention relates to an improved ball check valve for use in positive displacement subsurface pumps used in the petroleum industry for pumping crudes characterized in part by a high degree of suspended solid particles. In accordance with the present invention, the ball chec]c valve comprises a valve seat and a valve ball wherein the valve seat is comprised of a hollow cylindrical body defining an orifice through which fluid passes wherein the hollow cylindrical body is provided with an insert at the orifice of the hollow cylindrical body which forms the valve seat. In accordance with the present invention, the insert is formed of a material having a hardness greater -than the hardness of the material from which the hollow cylindrical body is formed and the valve ball is characterized by a high resiliency, a modulus of elasticity of between 0.1 x 106 psi to 15 x 106 psi and a surface hardness greater than that of the hollow cylindrical body. Preferably the insert is formed of a material having a hardness greater than the hardness of the material from which the valve ball is formed.
As a result of the relative differences in hardness of the #20/04/26/1990 ~, .. .
various parts of the hall check valve as set forth above, the cylindrical body which is formed of the softest material dissipates a substantial part of the force generated by the impact of the valve ball on the hard insert. As a consequence of this dissipation of energy, the force of reaction on the valve ball itself is reduced thereby increasing the useful life of the ball. In addition, by makinq the ball valve from a material which is relatively softer than that used for the insert, any damaqe due to the effects of impact and/or erosion would tend to occur to the valve ball rather than the insert which forms the actual valve seat. As noted above, damage to the valve ball is not as critical as damage to the valve seat since the valve ball freely rotates thereby lowering the probability that the valve ball will seal on the valve seat at the exact point of damage. In accordance with a particular feature of the present invention, the valve ball is characterized by a high resiliency, a modulu~ of elasticity of between 0.1 x 106 p8i to 15 x 106 psi and a surface hardness greater than that of the hollow cylindrical body.
I'he present invention relates to an improved check valve and, more particularly, an improved check valve for use in positive displacement subsurface pumps used in the petroleum industry for pumping crudes having a high degree of suspended solids.
Typical positive displacement pumps used in oil well pumping for pumping crudes employ check valves comprising a valve seat onto which a ball rests and seals against the seat. In a typical well pump, at least one check valve is located in the pump piston and a second check valve is positioned at the fluid inlet to the pump cylinder in which the piston is displaced so as to permit the flow of the pump fluid only in one direction. A typical valving arrangement of the kind discussed above is shown in U.S. Patent 4,018,547.
. ",. . .
~81X57 86-]46 When pumping heavy crudes characterized hy high contents of suspended solids there is a prohlem wi~h wear on t~e valve ball and the valve seat which limits the effec~ive life of the check valves. This wear is due to the effects of erosion caused by the suspended particles in the pumped fluid. In particular, as the valve ball moves closer to the valve seat, t~e velocity of the pumped fluid increases thereby increasing the likelihood of damage to the valve ball and valve seat by the suspended particles. When the valve ball and valve seat are damaged leakage of the pumped fluid will occur through the valve which results in a loss in volumetric efficiency of the pump and loss of production time when repair of the valve is necessary. Damage to the valve ball, while not desirable, is not as ~ritical as damage to the valve seat. When the valve ball is damaged leakage tends to be minimal as the likelihood of the valve ball, which freely rotates, to seal on the valve seat exactly at the point of damage is low. However, if the valve seat itself i8 damaged then leakage through the valve might tend to be continuous. By making the valve ball out of a material which is characterized by high resiliency, that is, a modulus of elasticity of between 0.1 x l06 psi to 15 x 10 psi, the valve ball will tend to rest on the valve seat by elastically ~8~57 deforming. Therefore, even damage to the valve seat would not allow for continuous leakage as was the case wlth the prior art.
Accordingly, the present invention seeks to provide a ball check valve for use in positive dis-placement subsurface pumps used in the petroleum industry for pumping crudes which is less susceptible to damage by impact and erosion due to suspended solids in the pumped fluid.
In particular the present invention seeks to provide a ball check valve wherein the valve seat comprises a hollow cylindrical body provided with an insert at the orifice of the body which forms the valve seat.
Still further the present invention seeks to provide a ball check valve as set forth above wherein the insert is formed of a material having a hardness greater than the hardness of the valve ball.
Still further the present invention seeks to provide a ball check valve as described above wherein the valve ball is formed of a material having a high resilience, a modulus of elasticity of between 0.1 x 106 psi to 15 x 106 psi and a surface hardness greater than the hardness of the hollow cylindrical body.
~ ~81~7 The present invention relates to an improved ball check valve for use in positive displacement subsurface pumps used in the petroleum industry for pumping crudes characterized in part by a high degree of suspended solid particles. In accordance with the present invention, the ball chec]c valve comprises a valve seat and a valve ball wherein the valve seat is comprised of a hollow cylindrical body defining an orifice through which fluid passes wherein the hollow cylindrical body is provided with an insert at the orifice of the hollow cylindrical body which forms the valve seat. In accordance with the present invention, the insert is formed of a material having a hardness greater -than the hardness of the material from which the hollow cylindrical body is formed and the valve ball is characterized by a high resiliency, a modulus of elasticity of between 0.1 x 106 psi to 15 x 106 psi and a surface hardness greater than that of the hollow cylindrical body. Preferably the insert is formed of a material having a hardness greater than the hardness of the material from which the valve ball is formed.
As a result of the relative differences in hardness of the #20/04/26/1990 ~, .. .
various parts of the hall check valve as set forth above, the cylindrical body which is formed of the softest material dissipates a substantial part of the force generated by the impact of the valve ball on the hard insert. As a consequence of this dissipation of energy, the force of reaction on the valve ball itself is reduced thereby increasing the useful life of the ball. In addition, by makinq the ball valve from a material which is relatively softer than that used for the insert, any damaqe due to the effects of impact and/or erosion would tend to occur to the valve ball rather than the insert which forms the actual valve seat. As noted above, damage to the valve ball is not as critical as damage to the valve seat since the valve ball freely rotates thereby lowering the probability that the valve ball will seal on the valve seat at the exact point of damage. In accordance with a particular feature of the present invention, the valve ball is characterized by a high resiliency, a modulu~ of elasticity of between 0.1 x 106 p8i to 15 x 106 psi and a surface hardness greater than that of the hollow cylindrical body.
2~7 BRIEF PESCRIPTION OF THE DRAWINGS
Figure 1 is a perspective view showing the ball check valve in accordance with the present invention.
Figure 2 is a sectional view of parts which form the ball c~eck valve seat in accordance with the present invention.
DETAILED DESCRIPTION
Referring to Figures 1 ana 2, a ball check valve 10 is illustrated which is particularly useful in subsurface positive displacement pumps used in the petroleum industry for pumping crudes characterized by a high degree of suspended solid particles.
The check valve 10 comprises a valve ball 12 and a valve seat assembly 14. With particular reference to Figure 2, the valve seat assembly 14 comprises a hollow cylindrical body J6 having on the external surface thereof a groove 18 in which an O-ring packing seal 20 is located. The flat surface 22 of hollow cylindrical body 16 facing valve ball ]2 in the area defining an orifice 26 is proviaed with a circular recess 28into which an insert 30 which forms the actual valve seat for valve ball 12 is secured. The insert 30 may be secured in cvlindrical body 16 by any suitable means such as press fit, gluing, metal bonding or the like. As can be ~8~5~
86-]46 seen from Figures 1 and 2, t~e orifice 26 defined by cylindrical body 16 and insert 30 has a diameter which i5 smaller than that of the valve ball 12 so as to allow the ball to sit and seal on insert 30 which forms the valve seat.
In accordance with the present invention, it is critical tha~ the insert 30 he formed from a material having a hardness which is greater than the hardness of the material from which the valve ball 12 is formed. In addition, it is critical that the valve ball 12 in turn be formed from a material having a surface hardness greater than the material from which the ho]low cylindrical body 16 is formed. It is preferred that insert 30 be formed of a material having a hardness of greater than 1300 on the Vickers scale. Suitable materials from which the insert ~0 may be formed include ceramic materials or sintered materials in particular carbides, such as, for example, tungsten carbide. It is preferred that valve ball 12 be formed of a material having a high resiliency, that is, a modulus of elasticity of between 0.1 x 106 psi to 15 x 10 psi and a surface hardness of between 600 to 1200 on the Vickers scale. Suitable materials from which the valve ball 12 may be formed include carbon based materials such as compres3ed graphite sold under the mark POC0 and 1~8~'~S7 86-1~6 manufactured by Poco Graphite Inc. of Decatur, Texas and polymeric materials sold under the mark TORLON and manufactured by Amoco. Finally, it is preferred that hollow cylinarical body 16 be formed of a material having a hardness of less than 500 on the Vickers scale. Suitable materials from which the hollow cylindrical body 16 may be formed include metallic materials and preferably stainless steel or other alloy steels.
As a result of the relative differences in hardness of the various parts of the ball check valve as set forth above, the cylindrical body which is formed of the softest material dissipates a substantial part of the force generated by the impact of the valve ball on the hard insert. As a consequence of this dissipation of energy, the force of reaction on the valve ball itself is reduced thereby increasing the useful life of the ball. In addition, by making the ball valve from a material which is relatively softer than that used for the insert, any damage due to the effects of impact and/or erosion wouid tend to occur to the valve ball rather than the insert which forms the actual valve seat. A~ noted above, damage to the valve ball is not as critical as damage to the valve seat since the valve ball freely rotates thereby lowering the probability ~81'~S7 86-146 that the valve hall wil1 seal on the valve seat at the exact point of damage. In accordance with a particular feature of the present i.nvention, the valve ba3l is characterized by a high resiliency, a modulus of elasticity of between O.l x 106 psi to 1.5 x lO psi and a surface hardness greater than that of the hollow cylindrical body.
It is to be understood that the invention is not limited to the illustrations described and shown herein, which are deemed to be merely il1ustrative of the best modes of carrying out the invention, and which are susceptib].e of modification of form, size, arrangement of parts and details of operation. The invention rather is intended to encompass all such modif;cations which are within its spirit and scope as defined by the claims.
Figure 1 is a perspective view showing the ball check valve in accordance with the present invention.
Figure 2 is a sectional view of parts which form the ball c~eck valve seat in accordance with the present invention.
DETAILED DESCRIPTION
Referring to Figures 1 ana 2, a ball check valve 10 is illustrated which is particularly useful in subsurface positive displacement pumps used in the petroleum industry for pumping crudes characterized by a high degree of suspended solid particles.
The check valve 10 comprises a valve ball 12 and a valve seat assembly 14. With particular reference to Figure 2, the valve seat assembly 14 comprises a hollow cylindrical body J6 having on the external surface thereof a groove 18 in which an O-ring packing seal 20 is located. The flat surface 22 of hollow cylindrical body 16 facing valve ball ]2 in the area defining an orifice 26 is proviaed with a circular recess 28into which an insert 30 which forms the actual valve seat for valve ball 12 is secured. The insert 30 may be secured in cvlindrical body 16 by any suitable means such as press fit, gluing, metal bonding or the like. As can be ~8~5~
86-]46 seen from Figures 1 and 2, t~e orifice 26 defined by cylindrical body 16 and insert 30 has a diameter which i5 smaller than that of the valve ball 12 so as to allow the ball to sit and seal on insert 30 which forms the valve seat.
In accordance with the present invention, it is critical tha~ the insert 30 he formed from a material having a hardness which is greater than the hardness of the material from which the valve ball 12 is formed. In addition, it is critical that the valve ball 12 in turn be formed from a material having a surface hardness greater than the material from which the ho]low cylindrical body 16 is formed. It is preferred that insert 30 be formed of a material having a hardness of greater than 1300 on the Vickers scale. Suitable materials from which the insert ~0 may be formed include ceramic materials or sintered materials in particular carbides, such as, for example, tungsten carbide. It is preferred that valve ball 12 be formed of a material having a high resiliency, that is, a modulus of elasticity of between 0.1 x 106 psi to 15 x 10 psi and a surface hardness of between 600 to 1200 on the Vickers scale. Suitable materials from which the valve ball 12 may be formed include carbon based materials such as compres3ed graphite sold under the mark POC0 and 1~8~'~S7 86-1~6 manufactured by Poco Graphite Inc. of Decatur, Texas and polymeric materials sold under the mark TORLON and manufactured by Amoco. Finally, it is preferred that hollow cylinarical body 16 be formed of a material having a hardness of less than 500 on the Vickers scale. Suitable materials from which the hollow cylindrical body 16 may be formed include metallic materials and preferably stainless steel or other alloy steels.
As a result of the relative differences in hardness of the various parts of the ball check valve as set forth above, the cylindrical body which is formed of the softest material dissipates a substantial part of the force generated by the impact of the valve ball on the hard insert. As a consequence of this dissipation of energy, the force of reaction on the valve ball itself is reduced thereby increasing the useful life of the ball. In addition, by making the ball valve from a material which is relatively softer than that used for the insert, any damage due to the effects of impact and/or erosion wouid tend to occur to the valve ball rather than the insert which forms the actual valve seat. A~ noted above, damage to the valve ball is not as critical as damage to the valve seat since the valve ball freely rotates thereby lowering the probability ~81'~S7 86-146 that the valve hall wil1 seal on the valve seat at the exact point of damage. In accordance with a particular feature of the present i.nvention, the valve ba3l is characterized by a high resiliency, a modulus of elasticity of between O.l x 106 psi to 1.5 x lO psi and a surface hardness greater than that of the hollow cylindrical body.
It is to be understood that the invention is not limited to the illustrations described and shown herein, which are deemed to be merely il1ustrative of the best modes of carrying out the invention, and which are susceptib].e of modification of form, size, arrangement of parts and details of operation. The invention rather is intended to encompass all such modif;cations which are within its spirit and scope as defined by the claims.
Claims (17)
1. In a subsurface positive displacement pump used in the petroleum industry for pumping crudes characterized by a high degree of suspended particles, a ball check valve comprising a valve ball and a valve seat assembly wherein the valve seat assembly comprises a hollow cylindrical body defining an orifice through which pumped fluid passes, the hollow cylindrical body being provided with a recess on the surface facing the valve ball in the region defining the orifice wherein an insert which forms the actual valve seat for the ball valve is secured in the recess said insert is formed from a material having a hardness which is greater than the hardness of the material from which the hollow cylindrical body is formed and said valve ball is formed from a material having a high resiliency, a modulus of elasticity of between 0.1 x 106 psi to 15 x 106 psi and a hardness which is greater than the hardness of the material from which the hollow cylindrical body is formed so as to dissipate the force generated by the impact of the valve ball on the insert.
2. A ball check valve according to claim 1 wherein the hardness of the material from which said insert is formed is greater than the surface hardness of the material from which the valve ball is formed such that any effects of impact and erosion would tend to occur on the valve ball rather than the insert.
3. A ball check valve according to claim 2 wherein said hollow cylindrical body is provided with a groove on the external cylindrical surface thereof.
4. A ball check valve according to claim 3 wherein an O-ring seal is provided in said groove.
5. A ball check valve according to claim 2 wherein said insert is formed from a material having a hardness of greater than 1300 on the Vickers scale.
6. A ball check valve according to claim 5 wherein said valve ball is formed from a material having a hardness of between 600 and 1200 on the Vickers scale.
7. A ball check valve according to claim 5 wherein said insert is formed from a sintered carbide material.
8. A ball check valve according to claim 7 wherein said insert is formed of tungsten carbide.
9. A ball check valve according to claim 1 wherein said hollow cylindrical body is formed of a material having a hardness of less than 500 on the Vickers scale,
10. A ball check valve according to claim 9 wherein said valve ball is formed from a material having a surface hardness of between 600 and 1200 on the Vickers scale.
11. A ball check valve according to claim 2 wherein said insert is formed from a material having a hardness of greater than 1300 on the Vickers scale.
12. A ball check valve according to claim 11 wherein said valve ball is formed from a material having a hardness of between 600 and 1200 on the Vickers scale.
13. A ball check valve according to claim 12 wherein said hollow cylindrical body is formed of a material having a hardness of less than 500 on the Vickers scale.
14. A ball check valve according to claim 13 wherein said insert is formed from a sintered carbide material.
15. A ball check valve according to claim 14 wherein said insert is formed of tungsten carbide.
16. A ball check valve according to claim 5 wherein said insert is formed from a ceramic material.
17. A ball check valve according to claim 13 wherein said insert is formed from a ceramic material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/857,962 US4662392A (en) | 1983-07-29 | 1986-05-01 | Check valve |
| US857,962 | 1986-05-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1281257C true CA1281257C (en) | 1991-03-12 |
Family
ID=25327122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 534994 Expired - Fee Related CA1281257C (en) | 1986-05-01 | 1987-04-16 | Check valve |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4662392A (en) |
| JP (1) | JPS6357972A (en) |
| CA (1) | CA1281257C (en) |
| DE (1) | DE3713116A1 (en) |
| FR (1) | FR2598180A1 (en) |
| GB (1) | GB2190173B (en) |
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| US5183075A (en) * | 1986-04-12 | 1993-02-02 | Stein Guenter | Check valve |
| JPH01138172A (en) * | 1987-11-24 | 1989-05-31 | Toyo Tanso Kk | Sintered material of graphite and mesocarbon microbead |
| US5217037A (en) * | 1991-11-26 | 1993-06-08 | Apv Gaulin, Inc. | Homogenizing apparatus having magnetostrictive actuator assembly |
| US5297580A (en) * | 1993-02-03 | 1994-03-29 | Bobbie Thurman | High pressure ball and seat valve with soft seal |
| DE19632348C1 (en) * | 1996-08-10 | 1997-11-20 | Schott Geraete | Piston burette with fully automatic valve system which helps ensure measurement accuracy |
| SE510129C2 (en) * | 1996-09-09 | 1999-04-19 | Lennart Nilsson | Active controlled ball valve |
| GB2333739B (en) * | 1996-10-11 | 2001-03-21 | Coraltech Ltd | Foamed article |
| JP4460774B2 (en) * | 1998-07-10 | 2010-05-12 | 株式会社荏原製作所 | Ball check valve |
| US6293517B1 (en) * | 2000-02-28 | 2001-09-25 | John D. McKnight | Ball valve having convex seat |
| US6367774B1 (en) * | 2000-04-19 | 2002-04-09 | Flowserve Corporation | Element having ceramic insert and high-strength element-to-shaft connection for use in a valve |
| US7713932B2 (en) * | 2001-06-04 | 2010-05-11 | Biocon Limited | Calcitonin drug-oligomer conjugates, and uses thereof |
| US6713452B2 (en) * | 2001-06-04 | 2004-03-30 | Nobex Corporation | Mixtures of calcitonin drug-oligomer conjugates comprising polyalkylene glycol, uses thereof, and methods of making same |
| US7311144B2 (en) * | 2004-10-12 | 2007-12-25 | Greg Allen Conrad | Apparatus and method for increasing well production using surfactant injection |
| US20080011487A1 (en) * | 2006-07-13 | 2008-01-17 | Blackhawk Environmental Co. | Drive piston and foot valve seat |
| US7600532B2 (en) * | 2006-11-01 | 2009-10-13 | Ingersoll Rand Company | Check valve having integrally formed seat and seal body |
| US20080145250A1 (en) * | 2006-12-14 | 2008-06-19 | Emerson Electric Co. | Oiler pump |
| US8061381B2 (en) * | 2007-01-30 | 2011-11-22 | Michael Ford | Sucker rod pump with improved ball and seat |
| US8287256B2 (en) * | 2007-11-01 | 2012-10-16 | Caterpillar Inc. | Valve assembly |
| DE102012102088A1 (en) * | 2012-03-13 | 2013-09-19 | Prominent Dosiertechnik Gmbh | Positive displacement pump with forced ventilation |
| CN103047451B (en) * | 2012-12-14 | 2014-11-26 | 山东恒远利废技术发展有限公司 | Check valve for slurry pipeline |
| WO2015081243A1 (en) * | 2013-11-26 | 2015-06-04 | S.P.M. Flow Control, Inc. | Valve seats for use in fracturing pumps |
| US11078903B2 (en) * | 2017-08-24 | 2021-08-03 | Kerr Machine Co. | Tapered valve seat |
| US10711778B2 (en) * | 2017-04-18 | 2020-07-14 | St9 Gas And Oil, Llc | Frac pump valve assembly |
| US11353117B1 (en) | 2020-01-17 | 2022-06-07 | Vulcan Industrial Holdings, LLC | Valve seat insert system and method |
| US10774828B1 (en) | 2020-01-17 | 2020-09-15 | Vulcan Industrial Holdings LLC | Composite valve seat system and method |
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| US11242849B1 (en) | 2020-07-15 | 2022-02-08 | Vulcan Industrial Holdings, LLC | Dual use valve member for a valve assembly |
| US11384756B1 (en) | 2020-08-19 | 2022-07-12 | Vulcan Industrial Holdings, LLC | Composite valve seat system and method |
| USD997992S1 (en) | 2020-08-21 | 2023-09-05 | Vulcan Industrial Holdings, LLC | Fluid end for a pumping system |
| USD986928S1 (en) | 2020-08-21 | 2023-05-23 | Vulcan Industrial Holdings, LLC | Fluid end for a pumping system |
| USD980876S1 (en) | 2020-08-21 | 2023-03-14 | Vulcan Industrial Holdings, LLC | Fluid end for a pumping system |
| US11391374B1 (en) | 2021-01-14 | 2022-07-19 | Vulcan Industrial Holdings, LLC | Dual ring stuffing box |
| US11434900B1 (en) | 2022-04-25 | 2022-09-06 | Vulcan Industrial Holdings, LLC | Spring controlling valve |
| US11920684B1 (en) | 2022-05-17 | 2024-03-05 | Vulcan Industrial Holdings, LLC | Mechanically or hybrid mounted valve seat |
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| US4286622A (en) * | 1980-01-21 | 1981-09-01 | Youichi Ninomiya | Check valve assembly |
| DE3167298D1 (en) * | 1980-07-24 | 1985-01-03 | British Nuclear Fuels Plc | Globe valve with insert seat |
| US4393895A (en) * | 1981-05-14 | 1983-07-19 | Sterling Drug Inc. | Check valve for use with high pressure pump |
| US4513778A (en) * | 1983-07-29 | 1985-04-30 | Intevep, S.A. | Check valve |
| JPS6081581A (en) * | 1983-10-11 | 1985-05-09 | アムノン・エフ・バダスツ | Ball check valve |
| US4655247A (en) * | 1986-01-17 | 1987-04-07 | Chromalloy American Corporation | Ball-type check valve assembly |
-
1986
- 1986-05-01 US US06/857,962 patent/US4662392A/en not_active Expired - Fee Related
-
1987
- 1987-04-16 DE DE19873713116 patent/DE3713116A1/en not_active Ceased
- 1987-04-16 CA CA 534994 patent/CA1281257C/en not_active Expired - Fee Related
- 1987-04-24 GB GB8709699A patent/GB2190173B/en not_active Expired - Fee Related
- 1987-04-28 FR FR8705988A patent/FR2598180A1/en active Pending
- 1987-05-01 JP JP62108791A patent/JPS6357972A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6357972A (en) | 1988-03-12 |
| US4662392A (en) | 1987-05-05 |
| GB8709699D0 (en) | 1987-05-28 |
| GB2190173B (en) | 1990-01-31 |
| FR2598180A1 (en) | 1987-11-06 |
| DE3713116A1 (en) | 1987-11-05 |
| GB2190173A (en) | 1987-11-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |