A system can include one or more valve arrangements with a working chamber to receive a working fluid at a first pressure, and a control chamber to receive fluid at a second pressure. A dynamic seal can be disposed on a land of a valve element. A supply passage can be in communication between the co
A system can include one or more valve arrangements with a working chamber to receive a working fluid at a first pressure, and a control chamber to receive fluid at a second pressure. A dynamic seal can be disposed on a land of a valve element. A supply passage can be in communication between the control chamber and a tank and can include a check valve. A relief valve can be disposed between the check valve and the control chamber. A pilot pump and another relief valve may be disposed upstream of the check valve. The relief valve downstream of the check valve can have a higher pressure limit than the downstream one. A pressure sensor may be disposed between the check valve and the control chamber and used to warn the operator of a high pressure in the control chamber.
대표청구항▼
1. A system, comprising: at least one valve device including a valve body and a valve element slidably disposed within a passageway formed in the valve body, wherein a first segment of the valve element and the valve body are arranged to define a working chamber to receive a working fluid at a first
1. A system, comprising: at least one valve device including a valve body and a valve element slidably disposed within a passageway formed in the valve body, wherein a first segment of the valve element and the valve body are arranged to define a working chamber to receive a working fluid at a first pressure, and the valve body and the valve element are arranged to define a control chamber to receive a control fluid at a second pressure, the valve element having a land; andan annular seal element disposed between the land and an inner surface, wherein the seal element and the land are together arranged to separate the working chamber and the control chamber and to move with axial movement of the valve element; anda pressure monitoring system fluidly coupled to the control chamber; anda controller in communication with the pressure monitoring system, configured to: receive a signal indicative of the second pressure;compare the second pressure with a predetermined pressure; andcommunicate a signal to an operator when the second pressure is at or above the predetermined pressure. 2. The system of claim 1, further including a supply passage extending between the control chamber and a tank. 3. The system of claim 2, further including a relief valve coupled to the supply passage. 4. The system of claim 3, wherein the relief valve is a second relief valve, the system further including a first relief valve coupled to the supply passage, and a check valve disposed downstream of the first relief valve and upstream of the second relief valve, wherein the second relief valve is set at a higher preset pressure limit than the first relief valve. 5. The system of claim 4, wherein the pressure sensor is coupled to the supply passage downstream of the check valve to detect pressure within the supply passage. 6. The system of claim 1, wherein the valve device further includes a pilot control assembly coupled to the supply passage and operable to permit selective pressurization of the control chamber. 7. The system of claim 6, wherein the controller is in communication with the pilot control assembly. 8. A system, comprising: at least one valve device including: a valve body;a valve element slidably disposed within a passageway formed in the valve body, a first segment of the valve element and the valve body arranged to define a working chamber to receive a working fluid at a first pressure, the valve body and the valve element arranged to define a control chamber separated from the working chamber to receive a control fluid at a second pressure, wherein a seal is formed between a land of the valve element and the valve body;a supply passage in communication with the control chamber and extending to a tank;a check valve coupled to the supply passage;a first relief valve coupled to the supply passage and disposed upstream of the check valve; anda second relief valve coupled to the supply passage and disposed downstream of the check valve and upstream of the control chamber, the second relief valve having a higher pressure limit than the first relief valve. 9. The system of claim 8, further including a pressure sensor associated with the control chamber; and a controller in communication with the pressure sensor, configured to: receive a signal indicative of the second pressure;compare the second pressure with a predetermined pressure; andcommunicate a warning signal to an operator when the second pressure is at or above the predetermined pressure. 10. The system of claim 8, further including a pilot pump coupled to the supply passage upstream of the first relief valve. 11. A method of mitigating seal wear provided with at least one valve device, the valve device including a valve body having a passageway formed therein, a valve element disposed within the passageway of the valve body and operable to move axially relative to the valve body, a working chamber defined between the valve element and the valve body, a control chamber defined between the valve element and the valve body and separated from the working chamber by a land, an annular seal disposed about the land and configured to move with axial movement of the valve element, a check valve coupled to the supply passage, a first relief valve coupled to the supply passage upstream of the check valve, and a second relief valve coupled to the supply passage downstream of the check valve and upstream of the control chamber, wherein the second relief valve is set a higher preset pressure limit than the first relief valve, the method comprising: supplying pressurized working fluid at a first pressure to the working chamber;supplying pressurized control fluid at a second pressure to the control chamber;selectively moving the second relief valve when the pressure of a fluid in the control chamber is at the higher preset pressure limit to permit passage of said fluid at said higher preset pressure limit to a tank. 12. The method of claim 11, wherein a pressure sensor is coupled to the supply passage downstream of the check valve and upstream of the control chamber, the method further including detecting a pressure associated with the supply passage with the pressure sensor. 13. The method of claim 12, further including coupling a controller to the pressure sensor, wherein the controller is configured to: receive a signal from the pressure sensor indicative of the pressure within the supply passage;compare the indicated pressure within the supply passage with a predetermined pressure; andcommunicate a warning signal to an operator when the indicated pressure within the supply passage is at or above the predetermined pressure. 14. The method of claim 11, wherein a pilot pump is coupled to the supply passage upstream of the first relief valve.
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이 특허에 인용된 특허 (12)
Oksanen Kari J. (Vancouver CAX) LaBar Grant V. (Surrey CAX), Automatic control valve.
Hartfiel Johannes (Neueichwaldstrasse 5 6800 Mannheim 31 DEX) Schmitt Manfred (Johann-Casimier-Str. 17 6701 Friedelsheim DEX), Method of and apparatus for control of saftey valves.
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