IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0878149
(2010-09-09)
|
등록번호 |
US-8695633
(2014-04-15)
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발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
29 |
초록
▼
Aspects of the invention are associated with the discovery of methods for operating rotary valves that reduce or minimize wear of the seal sheet, which is often the limiting factor in overall processing capability of the valve. The control of certain parameters associated with the rotary valve opera
Aspects of the invention are associated with the discovery of methods for operating rotary valves that reduce or minimize wear of the seal sheet, which is often the limiting factor in overall processing capability of the valve. The control of certain parameters associated with the rotary valve operation, and particularly the seating pressure of the seal sheet (e.g., the dome pressure), can extend the useful life of the seal sheet, thereby avoiding excessive maintenance and downtime costs. In preferred embodiments, control is on a real time basis.
대표청구항
▼
1. A method of minimizing wear of a rotary valve including a flat ported rotor, a flat ported stator and a seal sheet positioned therebetween, with the seal sheet including a first side adjacent the flat ported rotor, and wherein the seal sheet extends across multiple ports, comprising the method co
1. A method of minimizing wear of a rotary valve including a flat ported rotor, a flat ported stator and a seal sheet positioned therebetween, with the seal sheet including a first side adjacent the flat ported rotor, and wherein the seal sheet extends across multiple ports, comprising the method comprising: using a sensor to measure at least one of a breakout torque or a running torque wherein the breakout torque is the initial torque required to set the flat ported rotor in motion with respect to the flat ported stator and the running torque is the ongoing torque required to maintain the flat ported rotor in motion after such motion has been initiated by the breakout torque; andcontrolling, in real time during indexing of the rotary valve, a seating pressure on the first side of the seal sheet when indexing the rotor generally coaxially relative to the stator in response to the measured breakout torque or the measured running torque. 2. The method of claim 1, further comprising controlling the seating pressure with pressurized fluid in an enclosed space adjacent the flat ported rotor, whereby the seating pressure upon the first side of the seal sheet is transferred through the flat ported rotor to the first side of the seal sheet. 3. The method of claim 1, comprising controlling the seating pressure on the first side of the seal sheet in response to the measured breakout torque. 4. The method of claim 3, comprising controlling the seating pressure on the first side of the seal sheet in response to both the measured breakout torque and the measured running torque. 5. The method of claim 1, wherein, upon indexing the rotary valve, the seal sheet is rotated relative to a stationary track plate on the stator in face-to-face contact with the seal sheet at adjacent sealing surfaces. 6. The method of claim 5, wherein the track plate is on a second side of the seal sheet, opposite the first side on which the seating pressure is controlled. 7. The method of claim 5, wherein the seating pressure is controlled using a control system that maintains at least a minimum seating pressure. 8. The method of claim 7, wherein the minimum seating pressure is from about 2 psig (0.14 kg/cm2) to about 20 psig (0.28 kg/cm2) above a highest track pressure of the track plate. 9. The method of claim 5, wherein the seating pressure is controlled using a control system that maintains at most a maximum seating pressure. 10. The method of claim 9, wherein said maximum seating pressure is from about 75 psig (5.3 kg/cm2) to about 150 psig (10.5 kg/cm2) above a highest track pressure of the track plate. 11. The method of claim 5, wherein the seal sheet is rotated by a device in electrical communication with an indexing controller. 12. The method of claim 11, wherein the device is a motor or a cylinder. 13. The method of claim 11, wherein the seal sheet and an adjacent rotor plate are rotated by indexing the device through a drive shaft. 14. The method of claim 11, wherein the indexing controller receives a command signal that is a setpoint velocity of rotation or a setpoint acceleration of rotation. 15. The method of claim 14, wherein the command signal is in response to the measured breakout torque or the measured running torque. 16. The method of claim 15, wherein the command signal is in response to both the measured breakout torque and the measured miming torque during indexing of the rotary valve. 17. The method of claim 14, wherein a setpoint parameter selected from the group consisting of the setpoint velocity of rotation, the setpoint acceleration of rotation, the setpoint seating pressure, and combinations thereof, is in response to a deviation between a setpoint breakout torque and a measured breakout torque, a deviation between a setpoint running torque and a measured running torque, or both. 18. A method of minimizing wear of a rotary valve including a flat ported rotor, a flat ported stator and a seal sheet positioned therebetween, with the seal sheet including a first side adjacent the flat ported rotor, and wherein the seal sheet extends across multiple ports, the method comprising: indexing of the flat ported rotor coaxially relative to the flat ported stator;using a sensor to measure at least one of a breakout torque or a running torque wherein the breakout torque is the initial torque required, during indexing, to set the flat ported rotor in motion with respect to the flat ported stator and the running torque is the ongoing torque required, during indexing, to maintain the flat ported rotor in motion after such motion has been initiated by the breakout torque; andcontrolling, prior to a subsequent indexing of the flat ported rotor coaxially relative to the flat ported stator of the rotary valve, a seating pressure on the first side of the seal sheet in response the measured breakout torque of the prior indexing or the running torque measured during the prior indexing. 19. The method of claim 18, wherein the rotary valve rotates 360 degrees about an axis and the prior indexing of the rotary valve is the immediately prior indexing of the rotary valve or a prior indexing of the rotary valve at the same rotational position along the 360 degree rotation as the subsequent indexing of the rotary valve.
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