IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0536190
(2009-08-05)
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등록번호 |
US-8684037
(2014-04-01)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
1 인용 특허 :
40 |
초록
▼
A poppet valve assembly includes a body having a first axial end portion and a second axial end portion. The first axial end portion includes a tapered surface adapted for sealing engagement with a valve seat. The second axial end portion defines a metering orifice. The body defines a passage that i
A poppet valve assembly includes a body having a first axial end portion and a second axial end portion. The first axial end portion includes a tapered surface adapted for sealing engagement with a valve seat. The second axial end portion defines a metering orifice. The body defines a passage that includes an opening in the first axial end portion and is in fluid communication with the metering orifice. The passage includes a check valve seat. A check valve is disposed in the passage. The check valve is adapted to sealingly engage the check valve seat.
대표청구항
▼
1. A poppet valve assembly comprising: a body including a first axial end portion and a second axial end portion, the first axial end portion having a tapered surface adapted for sealing engagement with a valve seat, the second axial end portion including a circumferential surface defining an axiall
1. A poppet valve assembly comprising: a body including a first axial end portion and a second axial end portion, the first axial end portion having a tapered surface adapted for sealing engagement with a valve seat, the second axial end portion including a circumferential surface defining an axially extending metering slot, the second axial end portion including a spring guide that extends outwardly from an end surface along a central longitudinal axis of the body, the body defining a passage that includes an opening in the first axial end portion and is in fluid communication with the metering slot, the passage including a check valve seat;a check valve disposed in the passage, the check valve being laterally offset from the central longitudinal axis, the check valve being adapted to sealingly engage the check valve seat; anda valve housing defining a valve bore in which the body is received, the valve housing defining the valve seat, the metering slot cooperating with the valve housing to define a metering opening at the second axial end portion of the body when the body is offset from the valve seat, the metering opening being completely closed when the body is seated on the valve seat, the metering opening allowing fluid to pass therethrough when the body is offset from the valve seat, the body defining a fixed size orifice that extends from an end of the metering slot to the end surface of the second axial end portion of the body, and the check valve being configured to allow fluid to flow through the passage from the check valve seat toward the metering slot and the fixed size orifice and to prevent fluid from flowing through the passage from the metering slot and the fixed orifice toward the check valve seat. 2. The poppet valve assembly of claim 1, further comprising a plug assembly disposed in the passage, the plug assembly including a plug and a spring that interacts with the check valve, wherein the spring guide defines an axially extending notch to accommodate the plug. 3. The poppet valve assembly of claim 1, wherein the passage is offset from a central longitudinal axis of the body. 4. The poppet valve assembly of claim 1, wherein the check valve is biased into engagement with the check valve seat by a spring. 5. The poppet valve assembly of claim 1, wherein the tapered surface is frusto-conical in shape. 6. A valve assembly comprising: a main stage valve assembly including: a housing defining: a first fluid passage;a second fluid passage;a valve bore having a valve seat, the valve bore being in fluid communication with the first and second fluid passages, wherein the valve seat is disposed in the valve bore between the first and second fluid passages;a load holding cavity in selective fluid communication with the second fluid passage;a poppet valve assembly disposed in the valve bore, the poppet valve assembly including: a poppet valve being adapted for engagement with the valve seat, the poppet valve being configured to move within the valve bore along a first axis, the poppet valve having a body defining a passage through the body, the passage including a check valve seat, the passage providing fluid communication between the first fluid passage and the load holding cavity; anda check valve assembly disposed in the passage of the poppet valve, the check valve assembly including a check valve, a valve plug, and a valve spring, the valve plug includes an axial portion about which the valve spring is disposed so that the valve spring extends from the valve plug to the check valve, the check valve being adapted to move within the passage along a second axis that is laterally offset from the first axis, the check valve being adapted to reduce leakage through the passage in a direction from the load holding cavity to the first fluid passage. 7. The valve assembly of claim 6, wherein the passage includes a first portion that is in fluid communication with the first fluid passage and a second portion that is in fluid communication with the second fluid passage, the first portion having an inner diameter that is less than an inner diameter of the second portion. 8. The valve assembly of claim 6, wherein the passage is generally offset from a central longitudinal axis of the body of the poppet valve. 9. The valve assembly of claim 6, wherein the body of the poppet valve includes a first axial end portion and an oppositely disposed second axial end portion, the first axial end portion being adapted for engaging the valve seat, the second axial end portion defining a metering orifice in fluid communication with the passage. 10. The valve assembly of claim 6, further comprising a middle stage valve assembly in fluid communication with the poppet valve assembly, the middle stage valve assembly being adapted to provide fluid communication between the load holding cavity and the second fluid passage. 11. The valve assembly of claim 10, wherein the middle stage valve assembly is a four-way, three-position proportional valve. 12. The valve assembly of claim 6, wherein the first fluid passage is an inlet fluid passage and the second fluid passage is an outlet fluid passage. 13. A valve assembly comprising: a pilot stage valve assembly;a middle stage valve assembly in fluid communication with the pilot stage valve assembly;a main stage valve assembly in fluid communication with the middle stage valve assembly, the main stage valve assembly including: a housing defining: an inlet fluid passage;an outlet fluid passage;a valve bore having a valve seat, the valve bore being in fluid communication with the inlet and outlet fluid passages, wherein the valve seat is disposed in the valve bore between the inlet and outlet fluid passages;a load holding cavity, wherein the middle stage valve assembly provides fluid communication between the load holding cavity and the outlet fluid passage;a poppet valve assembly disposed in the valve bore, the poppet valve assembly including: a poppet valve being adapted for engagement with the valve seat, the poppet valve having a body defining a passage adapted to provide fluid communication between the inlet fluid passage and the load holding cavity through the body, the passage including a check valve seat, the passage extending along an axis through the body from a first end of the body to an opposite end of the body, the axis being offset from a central axis of the body; anda check valve assembly disposed in the passage of the poppet valve, the check valve assembly including a check valve, a valve plug, and a valve spring, the valve plug includes an axial portion about which the valve spring is disposed so that the valve spring extends from the valve plug to the check valve, the check valve being adapted to reduce leakage through the passage in a direction from the load holding cavity to the inlet fluid passage. 14. The valve assembly of claim 13, wherein the pilot stage valve assembly includes an electronic actuator. 15. The valve assembly of claim 14, wherein the electronic actuator is a voice coil. 16. The valve assembly of claim 13, wherein pilot stage valve assembly provides fluid to at least one end of a middle stage spool valve of the middle stage valve assembly to actuate the middle stage valve assembly. 17. The valve assembly of claim 13, wherein the body of the poppet valve includes a first axial end portion and an oppositely disposed second axial end portion, the first axial end portion being adapted for engaging the valve seat, the second axial end portion defining a metering orifice in fluid communication with the passage. 18. The valve assembly of claim 13, wherein the passage is offset from a central longitudinal axis of the body. 19. A valve assembly comprising: a main stage valve assembly including: a housing defining: a first fluid passage;a second fluid passage;a valve bore having a valve seat, the valve bore being in fluid communication with the first and second fluid passages, wherein the valve seat is disposed in the valve bore between the first and second fluid passages;a load holding cavity in selective fluid communication with the second fluid passage;an end plug disposed within the valve bore;a poppet valve assembly disposed in the valve bore, the poppet valve assembly including: a poppet valve including a body having a first central axis that extends between a first end of the body and a second end of the body, the poppet valve being configured to move along the first central axis relative to the valve bore, the body defining a tapered surface at the first end and defining a metering orifice at a position between the first and second ends, the tapered surface being adapted for sealing engagement with a valve seat;the body defining a passage adapted to provide fluid communication between the first fluid passage and the load holding cavity through the body, the passage including a check valve seat, the body including a spring guide extending upwardly from the second end of the body, the spring guide extending along the first central axis, the spring guide defining an axially extending notch;a spring disposed around the spring guide so that the spring extends along the first central axis, the spring having one end abutting the second end of the body and another end abutting the end plug, the spring enabling the poppet valve to move along the first central axis; anda check valve assembly disposed in the passage, the check valve assembly including a check valve, a valve plug, and a valve spring, the check valve being adapted to sealingly engage the check valve seat, the valve plug having a portion that fits in the axially extending notch defined in the spring guide, the valve spring being laterally offset from the spring and enabling the check valve to move along a second central axis of the valve plug, the second central axis being laterally offset from the first central axis, and the second central axis being parallel to the first central axis and to the axial notch defined in the spring guide. 20. The poppet valve assembly of claim 1, wherein the passage extends from a bottom end surface of the body to a top end surface of the body, and wherein a cross-hole provides fluid communication between the passage and the metering slot. 21. The poppet valve assembly of claim 1, wherein the passage is parallel to the central longitudinal axis of the body. 22. A valve assembly comprising: a valve housing defining a valve bore, a fluid inlet passage, a fluid outlet passage, a first cavity and a second cavity, the first cavity providing fluid communication between the fluid inlet passage and the fluid outlet passage and the second cavity is a load holding cavity, the valve housing also at least partially defining a flow path that extends from the load holding cavity to the fluid outlet passage, the valve housing also including a valve seat positioned adjacent to the first cavity;a proportional flow valve positioned along the flow path for controlling a rate of flow through the flow path between the load holding cavity and the outlet passage, the proportional flow valve also having a neutral position where the flow path is blocked by the proportional flow valve;a valve body positioned within the valve bore, the valve body having a first axial end and a second axial end, the valve body being axially movable within the valve bore to a seated position in which the first axial end of the valve body seats on the valve seat to block fluid communication between the inlet and outlet passages though the first cavity, the valve body being axially movable within the valve bore to unseat the first axial end of the valve body from the valve seat to allow fluid communication between the inlet and outlet passages through the first cavity, the second axial end of the valve body being exposed to fluid within the load holding cavity;the valve body defining a valve through-path arrangement that extends through the valve body to provide fluid communication between the inlet passage and the load holding cavity, the valve through-path arrangement including a metering slot having an open side positioned at a circumferential surface of the valve body, the metering slot cooperating with the valve housing to define a metering opening that provides fluid communication between the valve through-path and the load holding cavity when the valve body is unseated from the seated position, the metering opening is completely blocked when the valve body is in the seated position, the valve through-path arrangement also including a fixed size orifice that is in constant fluid communication with the load holding cavity regardless of whether the valve body is seated on the valve seat or unseated from the valve seat;a spring for biasing the valve body to the seated position; anda check valve positioned within the valve body, the check-valve being configured to allow flow through the valve through-path arrangement from the inlet passage to the load holding cavity and to prevent flow through the valve through-path arrangement from the load holding cavity to the inlet passage, a seat of the check valve being positioned at an intermediate location along the valve through-path arrangement, and the fixed size orifice being positioned between the valve seat and the load holding cavity. 23. The valve assembly of claim 22, wherein the fixed orifice is located between an end of the metering slot and the load holding cavity. 24. The valve assembly of claim 22, wherein the valve through-passage arrangement includes a portion aligned along an axis that is offset from a longitudinal axis of the valve body.
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