Pressure-dependent check valve and hydraulic system equipped therewith
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G05D-016/10
G05D-016/04
출원번호
UP-0559549
(2004-05-27)
등록번호
US-7617841
(2009-11-27)
우선권정보
DE-103 25 202(2003-06-04)
국제출원번호
PCT/EP04/005712
(2004-05-27)
§371/§102 date
20060320
(20060320)
국제공개번호
WO04/109166
(2004-12-16)
발명자
/ 주소
Zimpfer, Michael
Hilgert, Andreas
출원인 / 주소
Eaton Fluid Power GmbH
대리인 / 주소
Benesch, Friedlander, Coplan & Aronoff LLP
인용정보
피인용 횟수 :
10인용 특허 :
2
초록▼
The inventive sliding valve (8) comprises a slide (18), which is mounted in a manner that enables it to move transversal to the passage channel (11). This valve is provided with an asymmetrical design whereby enabling the pressure prevailing in the passage channel (11) to reach a side of the slide (
The inventive sliding valve (8) comprises a slide (18), which is mounted in a manner that enables it to move transversal to the passage channel (11). This valve is provided with an asymmetrical design whereby enabling the pressure prevailing in the passage channel (11) to reach a side of the slide (18) via suitable ducts (25, 26), whereas the other side is not subjected to any pressure or only to a constant low pressure. A pressure spring (29) works counter to the pressure and holds the slide (18) in the open position. In the event the fluid pressure prevails, the slide (18) is displaced into the blocking position in which it remains until the pressure falls below the switching limit once again.
대표청구항▼
The invention claimed is: 1. A hydraulic system including a hydraulic pump, a load, an actuator for moving the load, a control valve fluidly connected to the actuator, at least two branches parallel to each other and fluidly connected between the hydraulic pump and the control valve with each branc
The invention claimed is: 1. A hydraulic system including a hydraulic pump, a load, an actuator for moving the load, a control valve fluidly connected to the actuator, at least two branches parallel to each other and fluidly connected between the hydraulic pump and the control valve with each branch including at least one damper, and at least one slide valve arranged in one of the branches, the slide valve comprising: a valve housing having a passage channel with a slide bore extending in a direction transverse to the passage channel; and a slide supported within and longitudinally movable relative to the slide bore between an open position and a blocking position, the slide having a head, a blocking portion defining a blocking position when the blocking portion is aligned with the passage channel, and a pin portion connecting the head to the blocking portion and defining an open position when the pin portion is aligned with the passage channel, wherein the blocking portion divides the slide bore into a chamber, wherein at least one channel is provided that permits fluid communication between the chamber and the passage channel, thereby allowing the chamber to be subjected to the fluid pressure prevailing in the passage channel, wherein, when the pressure in the passage channel exceeds a predetermined fluid pressure, the slide moves to its blocking position. 2. The hydraulic system of claim 1, wherein the head is supported in a sealed manner in the slide bore. 3. The hydraulic system of claim 1, wherein the head divides the slide bore into a vented chamber. 4. The hydraulic system of claim 1, further including a compression spring to pre-tension the slide, the spring including a first end abutting the head and a second end abutting an abutment. 5. The hydraulic system of claim 4, wherein the abutment is adjustable. 6. The hydraulic system of claim 4, wherein the compression spring is arranged in the chamber. 7. The hydraulic system of claim 1, wherein the blocking portion is connected to the head by a pin portion having a diameter that is smaller than a diameter of the blocking portion. 8. The hydraulic system of claim 1, wherein the blocking portion has a diameter which is slightly smaller than a diameter of a section of the slide bore accommodating the head, such that the slide bore defines a damping gap with the blocking portion when the blocking portion is moved toward the blocking position. 9. The hydraulic system of claim 1, wherein the diameter of the slide bore is at least as large as the diameter of the passage channel. 10. The hydraulic system of claim 1, further comprising a compression spring for providing a spring force that urges the slide toward the open position against the fluid pressure in the passage channel, wherein the spring force is sized such that: when the fluid pressure prevailing within the passage channel is less than the predetermined fluid pressure, the slide remains in its open position, and when the fluid pressure prevailing within the passage channel is greater than the predetermined fluid pressure, the slide moves to its blocking position. 11. The hydraulic system of claim 1, wherein the at least one channel is provided in the blocking portion of the slide. 12. The hydraulic system of claim 1, wherein the at least one channel includes a bypass channel provided in the valve housing upstream from the slide. 13. A hydraulic system comprising: a hydraulic pump, an actuator for moving a load; a control valve fluidly connected to the actuator; at least two branches fluidly connected between the pump and the control valve, each branch including at least one damper; and a pressure sensitive, shut-off valve provided in one of the branches, the shut-off valve including: a valve housing having a passage channel with a slide bore extending in a direction traverse to the passage channel, and a slide supported in the slide bore so as to be moveable in the traverse direction within the slide bore between an open position permitting flow through the passage channel and a closing position preventing flow through the passage channel, wherein the slide is configured to switch from its open position to its closed position when the pressure in the passage channel exceeds a predetermined pressure limit. 14. The hydraulic system of claim 13, wherein the shut-off valve is provided between the pump and the damper. 15. The hydraulic system of claim 13, wherein the slide includes a head, a blocking portion that defines the blocking position, and a pin portion that connects the head to the blocking portion and defines the open position. 16. The hydraulic system of claim 15, wherein the blocking portion divides the slide bore into a chamber, wherein at least one channel is provided that permits fluid communication between the chamber and the passage channel, thereby allowing the chamber to be subjected to the fluid pressure prevailing in the passage channel, wherein, when the pressure in the passage channel exceeds a predetermined pressure limit, the slide moves from its open position to its blocking position. 17. The hydraulic system of claim 16, wherein the at least one channel is provided in the blocking portion of the slide. 18. The hydraulic system of claim 16, wherein the at least one channel includes a bypass channel provided in the valve housing. 19. The hydraulic system of claim 13, further comprising a compression spring for providing a spring force that urges the slide toward the open position against the fluid pressure in the passage channel, wherein the spring force is sized such that: when the pressure prevailing within the passage channel is less than the predetermined pressure limit, the slide remains in its open position, and when the pressure prevailing within the passage channel is greater than the predetermined pressure limit, the slide moves from its open position to its blocking position.
연구과제 타임라인
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이 특허에 인용된 특허 (2)
Canzano Pasquale S. (31 Candlewicke Dr. Dover DE 19901) Vinton Brock J. (501 Greenbank Rd. Wilmington DE 19804), Gas pressure regulator for controlling low pressure.
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