Rotary valve actuators having partial stroke damping apparatus
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F16K-031/12
출원번호
US-0552814
(2009-09-02)
등록번호
US-8567752
(2013-10-29)
발명자
/ 주소
ter Horst, Gerard
van Dorp, Erwin
출원인 / 주소
Emerson Process Management, Valve Automation Inc.
대리인 / 주소
Hanley, Flight & Zimmerman, LLC.
인용정보
피인용 횟수 :
1인용 특허 :
17
초록▼
Rotary valve actuators having partial stroke damping apparatus are described herein. An example rotary valve actuator described herein includes a housing containing a first piston and a second piston opposite the first piston, where the pistons move in opposite directions to rotate a shaft of the ro
Rotary valve actuators having partial stroke damping apparatus are described herein. An example rotary valve actuator described herein includes a housing containing a first piston and a second piston opposite the first piston, where the pistons move in opposite directions to rotate a shaft of the rotary valve actuator. A damper is operatively coupled to at least one of the first piston or the second piston to slow the movement of the piston for only a portion of a stroke of the rotary valve actuator.
대표청구항▼
1. A rotary valve actuator, comprising: a housing containing a first piston and a second piston opposite the first piston to define an inner chamber therebetween, wherein the pistons are to move in opposite directions to rotate a shaft of the rotary valve actuator;a first port in fluid communication
1. A rotary valve actuator, comprising: a housing containing a first piston and a second piston opposite the first piston to define an inner chamber therebetween, wherein the pistons are to move in opposite directions to rotate a shaft of the rotary valve actuator;a first port in fluid communication with the inner chamber and a first fluid pathway;a second port different than the first port, the second port in fluid communication with the inner chamber and a second fluid pathway; anda damper coupled to at least one of the first piston or the second piston to slow the movement of the pistons for only a portion of a stroke of the rotary valve actuator, wherein the first piston is to move the damper between a first position to enable fluid flow between the inner chamber and the first port and a second position to substantially prevent fluid flow between the inner chamber and the first port over the portion of the stroke, wherein fluid in the inner chamber is directed toward the second port when the damper is in the second position. 2. A rotary valve actuator of claim 1, wherein the damper comprises a blocking element coupled to a first body portion of the first piston. 3. A rotary valve actuator of claim 2, wherein the first fluid pathway fluidly couples the inner chamber and a vent when the blocking element is in the first position. 4. A rotary valve actuator of claim 2, wherein the first body portion has a slot to receive the blocking element. 5. A rotary valve actuator of claim 4, wherein the blocking element is coupled within the slot of the first piston via an interference fit. 6. A rotary valve actuator of claim 5, wherein the blocking element comprises a pad. 7. A rotary valve actuator of claim 2, wherein the blocking element comprises a flexible member coupled to a holder. 8. A rotary valve actuator of claim 7, wherein the flexible member comprises a spring. 9. A rotary valve actuator of claim 1, wherein the second fluid pathway includes a fluid flow restrictor so that fluid flow through the second fluid pathway when the blocking element is in the second position is less than the fluid flow between the inner chamber and the first port when the blocking element is in the first position. 10. A rotary valve actuator of claim 9, further comprising a third fluid pathway to be fluidly coupled to the second port or the first port and having a one-way valve to allow fluid flow through the third fluid pathway in a first direction and restrict fluid flow through the third fluid pathway in a second direction opposite the first direction. 11. A rotary valve actuator of claim 10, wherein the second fluid pathway fluidly couples the inner chamber to the vent when the blocking element is in the second position, and the third fluid pathway is to fluidly couple the inner chamber to a fluid supply source. 12. A rotary valve actuator of claim 2, wherein the first piston further comprises an opening within the first body portion to fluidly couple the first port and the inner chamber when the opening is aligned with the first port. 13. A rotary valve actuator of claim 12, wherein the blocking element comprises a second housing having a movable member aligned with the opening of the first piston. 14. A rotary valve actuator of claim 13, further comprising a biasing element to bias the movable member toward a closed position. 15. A rotary valve actuator of claim 14, wherein the movable member is to move to an open position to allow fluid flow in a first direction from the first port to the inner chamber when the blocking element is in the first position and pressurized fluid is provided to the inner chamber, and wherein the movable member is to move to a closed position to substantially restrict fluid flow in a second direction from the inner chamber to the first port when the inner chamber contains pressurized fluid and the blocking element is in the second position. 16. A rotary valve actuator of claim 12, wherein the first body portion of the first piston further comprises a first bore substantially perpendicular to the opening of the first piston, and wherein blocking element is disposed within the first bore. 17. A rotary valve actuator of claim 16, wherein the blocking element comprises a rod having a tapered surface that faces the first port. 18. A rotary valve actuator of claim 17, wherein the tapered surface enables the blocking element to move away from the opening and the first port to allow fluid flow in a first direction from the first port to the inner chamber when the opening of the first piston is aligned with the first port and pressurized fluid is provided in the inner chamber, and wherein the blocking element restricts fluid flow in a second direction from the inner chamber to the first port when the opening is aligned with the first port and the blocking element is in the second position. 19. A rotary valve actuator of claim 18, further comprising a biasing element disposed within the first bore to bias the blocking element toward the opening of the first piston. 20. The rotary valve actuator of claim 1, wherein the damper comprises a flexible member coupled to the first piston. 21. The rotary valve actuator of claim 20, wherein the flexible member is to flex away from the first port when the flexible member is positioned adjacent the first port and a fluid is flowing into the inner chamber via the first port. 22. The rotary valve actuator of claim 20, wherein the flexible member flexes relative to the first port to provide a one-way valve such that the flexible member moves away from the first port to allow fluid flow into the inner chamber via the first port and moves toward the first port to prevent fluid flow from the inner chamber via the first port.
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