Proportional poppet valve with integral check valve
AssigneeEaton Corporation
InventorTam C. Huynh
Life of this patent
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Abstract
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.
Claims20
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 defining a metering orifice, the body defining a passage that includes an opening in the first axial end portion and is in fluid communication with the metering orifice, the passage including a check valve seat;
- and
- a check valve disposed in the passage, the check valve being adapted to sealingly engage the check valve seat.
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 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;
- and
- a check valve disposed in the passage of the poppet valve, the check valve being adapted to reduce leakage through the passage in a direction from the load holding cavity to the first fluid passage.
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;
- and
- a check valve disposed in the passage of the poppet 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.
Dependencies are inferred from the claim text.