| 主权项 |
1. A poppet valve assembly comprising:
a valve housing having a central bore; a first module disposed within the central bore, the first module comprising a first normally closed poppet valve and a second normally closed poppet valve, wherein each of the first and second normally closed poppet valves has an open position and a closed position; a central port formed in the first module, wherein the central port of the first module is adapted to be coupled to a first volume of a pneumatic cylinder; an exhaust port formed in the first module such that the central port is in fluid communication with the exhaust port when the first poppet valve is in the open position; and a supply port formed in the first module such that the central port is in fluid communication with the supply port when second poppet valve is in the open position, wherein the supply port is configured to be in fluid communication with a supply of pressurized fluid such that when the second poppet valve is in the open position, pressurized fluid is provided to the first volume of the pneumatic cylinder, and wherein the exhaust port is configured to vent pressurized fluid from the first volume of the pneumatic cylinder when the first poppet valve is in the open position, wherein the first normally closed poppet valve comprises a first volume and the second normally closed poppet valve comprises a second volume, wherein the first poppet valve comprises:
a first diaphragm circumferentially secured to the first module, the first diaphragm at least partially defining the first volume;a first valve plug coupled to the first diaphragm; anda first valve seat formed in a first central aperture that is in fluid communication with a central passage,wherein a first spring disposed within the first volume biases the first valve plug into sealing engagement with the first valve seat such that the first poppet valve is normally closed, wherein said first spring is disposed between the first diaphragm and an inner wall of the first volume of said first module and wherein the second poppet valve comprises:
a second diaphragm circumferentially secured to the first module, the second diaphragm at least partially defining the second volume;a second valve plug coupled to the second diaphragm; anda second valve seat formed in a second central aperture that is in fluid communication with the central passage,wherein a second spring disposed within the second volume biases the second valve plug into sealing engagement with the second valve seat such that the second poppet valve is normally closed, wherein said second spring is disposed between the second diaphragm and a second inner wall of the second volume of said first module, and wherein the first poppet valve is configured to be maintained in the closed position by a supply of pressurized fluid introduced into the first volume, and the second poppet valve is configured to be maintained in the closed position by a supply of pressurized fluid introduced into the second volume, and wherein at least one seal is disposed on an external surface of the first module surrounding the first volume, and at least one seal is disposed on the external surface of the first module surrounding the second volume, all of said seals sealingly contact the central bore. |
