| 摘要 |
A valve device provided to the outlet port of an air compressor for subjecting the compressor to a limited back pressure until the compressor gains enough speed to be able to pick up the full load. Thereafter the device operates to open the passage to the compressed air tank. This device is provided with a casing having a main passage therethrough in which there is positioned a check valve which controls the passage to the compressed air tank. This device also includes a cylinder which is connected to the casing by a restriction hole and the cavity of this cylinder is normally open to the atmosphere. A valve member is provided in the cylinder cavity responsive to the flow of air into the cavity through said restriction hole and this valve member functions to close an exhaust hole when the air compressor approaches delivery of normal compressed air output. The check valve in the main passage is then opened and compressed air flows into the tank.
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