A cartridge valve assembly includes a body having a pilot port, a first port, a second port, a third port fluidly connected to a central bore, and a spool positioned within the central bore and being movable between at least a first position and a second position. The spool includes a first chamber
A cartridge valve assembly includes a body having a pilot port, a first port, a second port, a third port fluidly connected to a central bore, and a spool positioned within the central bore and being movable between at least a first position and a second position. The spool includes a first chamber at a first end surface of the spool in fluid communication with the pilot port, a second chamber at a second end surface of the spool, and a control chamber. The area of the first end surface is greater than the area of the second end surface. A passage fluidly communicates the control chamber with the second chamber. In the first position, the first port and the second port fluidly communicate with the control chamber. In the second position, the second port and the third port fluidly communicate with the control chamber.
대표청구항▼
What is claimed is: 1. A cartridge valve assembly comprising: a body having a pilot port, a first port, a second port, and a third port fluidly connected to a central bore; a spool positioned within the central bore and being movable between at least a first position and a second position, the spoo
What is claimed is: 1. A cartridge valve assembly comprising: a body having a pilot port, a first port, a second port, and a third port fluidly connected to a central bore; a spool positioned within the central bore and being movable between at least a first position and a second position, the spool including: a first chamber at a first end surface of the spool in fluid communication with the pilot port; a second chamber at a second end surface of the spool; a control chamber; and a slug bore extending from the second end surface of the spool to a bottom of the spool, the second chamber being formed within the slug bore of the spool; wherein the area of the first end surface is greater than the area of the second end surface; a passage fluidly communicating the control chamber with the second chamber; a slug member slidably received within the slug bore of the spool, the slug member including a bore forming the second chamber with the second end surface; and a lower stop member disposed between the slug and the body, wherein, in the second position, an upper portion of the lower stop member is received in the slug bore of the spool; and wherein, in the first position, the first port and the second port of the body fluidly communicate with the control chamber, and, in the second position, the second port and the third port fluidly communicate with the control chamber. 2. The cartridge valve assembly of claim 1, further including a housing forming a cavity, and including a first port, a second port, and a third port fluidly connected to the cavity, wherein the first port, the second port, and the third port of the body are respectively in fluid communication with the first port, the second port, and the third port of the housing. 3. The cartridge valve assembly of claim 2, further including sealing members adapted to be positioned between an outer surface of the body and an inner surface of the cavity to separate the pilot port of the body, the first port of the body, the second port of the body, and the third port of the body from each other. 4. The cartridge valve assembly of claim 2, further comprising an adapter coupled to an end of the body, wherein the adapter is adapted to sealingly engage the cavity of the housing to prevent fluid from flowing out of the cavity of the housing. 5. The cartridge valve assembly of claim 1, further including a spring received in the bore of the slug member and coupled to the second end surface of the spool, and being adapted to urge the spool to move from the second position to the first position. 6. The cartridge valve assembly of claim 1, wherein the spool includes a first end section, a second end section and an intermediate section, wherein the intermediate section has a smaller diameter than the first end section and the second end section, the intermediate section and the central bore of the body forming the control chamber. 7. A hydraulic actuation system comprising: a housing forming a cavity, and including a first port, a second port, and a third port fluidly connected to the cavity; a tank fluidly connected to the first port of the housing; an actuator fluidly connected to the second port of the housing; a pump fluidly connected to the third port of the housing; a body adapted to be inserted into the cavity of the housing, and including a central bore extending along a central axis, a pilot port, a first port, a second port, and a third port fluidly connected to the central bore, wherein the first port, the second port, and the third port of the body are respectively in fluid communication with the first port, the second port, and the third port of the housing; a spool received in the central bore of the body and being movable between a first position and a second position, the spool forming a first chamber within the central bore at a first end surface of the spool, a second chamber within the central bore at a second end surface of the spool, and a control chamber within the central bore, the area of the first end surface being greater than the area of the second end surface, the pilot port being fluidly connected to the first chamber, the second port being fluidly connected to the control chamber, and the first port and the third port being selectively controlled by the spool to open to the control chamber, the spool including a slug bore extending from the second end surface of the spool to a bottom of the spool, the second chamber being formed within the slug bore of the spool; a passage fluidly communicating the control chamber with the second chamber, a slug member slidably received within the slug bore of the spool, the slug member including a bore forming the second chamber with the second end surface; and a lower stop member disposed between the slug and the body, wherein, in the second position, an upper portion of the lower stop member is received in the slug bore of the spool; and wherein, in the first position, the first port and the second port of the body are in fluid communication with the control chamber, allowing fluid to flow from the actuator to the tank, and, in the second position, the second port and the third port of the body are in fluid communication with the control chamber, allowing fluid to flow from the pump to the actuator. 8. The hydraulic actuation system of claim 7, further comprising a spring coupled to the spool and being adapted to urge the spool from the second position to the first position. 9. The hydraulic actuation system of claim 7, further comprising sealing members adapted to be positioned between an outer surface of the body and an inner surface of the cavity to separate the pilot port of the body, the first port of the body, the second port of the body, and the third port of the body from each other. 10. The hydraulic actuation system of claim 7, further comprising a spring received in the bore of the slug member and coupled to the second end surface of the spool, and being adapted to urge the spool to move from the second position to the first position. 11. The hydraulic actuation system of claim 7, wherein the spool includes a first end section, a second end section and an intermediate section, wherein the intermediate section has a smaller diameter than the first end section and the second end section, the intermediate section and the central bore of the body forming the control chamber. 12. The hydraulic actuation system of claim 7, further comprising an adapter coupled to an end of the body, wherein the adapter is adapted to sealingly engage the cavity of the housing to prevent fluid from flowing out of the cavity of the housing.
Roth James E. (Los Angeles CA) Atchley Raymond D. (Los Angeles CA) Chen-Zion Ori D. (Woodland Hills CA) Pegram John B. (Los Angeles CA) Gunderson Maurice E. P. (Orinda CA), Pressure control valve for a hydraulic actuator.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.