IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0321232
(1999-05-27)
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발명자
/ 주소 |
- Anderson David L.
- Dzioba David A.
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출원인 / 주소 |
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대리인 / 주소 |
Reising, Ethington, Barnes, Kisselle, Learman & McCulloch, P.C.
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인용정보 |
피인용 횟수 :
4 인용 특허 :
20 |
초록
▼
A normally closed, three-way valve comprises a housing having a supply passage, a control passage, and an exhaust passage. A valve assembly controls communication between the passages. The valve assembly includes a valve in the supply passage to open and close communication between the supply and co
A normally closed, three-way valve comprises a housing having a supply passage, a control passage, and an exhaust passage. A valve assembly controls communication between the passages. The valve assembly includes a valve in the supply passage to open and close communication between the supply and control passages. The valve assembly also includes a second valve in the exhaust passage to open and close communication between the control and exhaust passages. The supply passage valve is normally held closed by the pressure of hydraulic fluid in the supply passage. A solenoid, when activated, moves the exhaust passage valve to closed position. A pintle between the two valves is shifted in one direction by the closing of the exhaust passage valve to open the supply passage valve against the pressure of fluid in the supply passage. The pintle is shifted in the opposite direction by the supply passage valve when the solenoid is de-activated, to move the exhaust passage valve to its open position. A spring in the supply passage acts on the supply passage valve in the open position thereof and during an initial portion only of its movement toward the closed position to assist the fluid pressure in the supply passage in moving that valve to the closed position. The spring is loosely captured between the supply passage valve and a stop in the supply passage so that it does not act on the supply passage valve when it is closed. Hence, the supply passage valve is held closed solely by the pressure of fluid in the supply passage.
대표청구항
▼
[ What is claimed:] [1.] Normally closed, three-way valve structure comprisinga valve housing,said housing having a supply passage for fluid under pressure entering said housing, a control passage, and an exhaust passage,a valve assembly for controlling communication between said supply passage and
[ What is claimed:] [1.] Normally closed, three-way valve structure comprisinga valve housing,said housing having a supply passage for fluid under pressure entering said housing, a control passage, and an exhaust passage,a valve assembly for controlling communication between said supply passage and said control passage and between said control passage and said exhaust passage,said valve assembly comprising a first valve in said supply passage movable between open and closed positions to open and close communication between said supply and control passages,said valve assembly comprising a second valve movable between open and closed positions to open and close communication between said control and exhaust passages,said first valve normally being held in a closed position by the pressure of fluid in said supply passage,control means operative, when activated, to move said second valve to the closed position thereof, anda pintle between said first and second valves,said pintle being shifted in one direction by said second valve, when the latter is moved to the closed position thereof in response to activation of said control means, to move said first valve to the open position thereof against the pressure of fluid in said supply passage,said pintle being shifted in the opposite direction by said first valve when said control means is de-activated, to move said second valve to the open position thereof,said valve assembly further comprising spring means applying force on said first valve in the open position thereof and during an initial portion only of its movement toward the closed position thereof to assist the fluid pressure in said supply passage in causing the initial movement of said first valve toward the closed position thereof,a stop in said supply passage,said spring means comprising a compression coil spring loosely captured between said first valve and said stop,said first valve, when in the closed position thereof, being spaced from said stop a distance which exceeds the length of the coil spring in the uncompressed natural, free-state condition of the latter, whereby said first valve is completely relieved of the force of said spring means when said first valve is in the closed position thereof.
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