| 摘要 |
A fluid operated pumping system which includes a main power cylinder divided into a power chamber and a pump chamber by a reciprocally mounted power piston. An actuator piston is connected to the power piston for synchronous movement therewith and is reciprocably mounted in an actuator cylinder. A diaphragm type four-way transfer valve is interposed between a power fluid source and the main power cylinder and actuator cylinder, to both of which the valve is connected, and functions to alternately and cyclically charge power fluid at a relatively high pressure to the power cylinder and actuator cylinder, and to concurrently discharge power fluid at a relatively low pressure. The system further includes a needle valve controlled, diaphragm-type, astable pneumatic amplifier which is connected to, and controls the movement of, the transfer valve. A check valve subassembly is associated with the pump chamber of the main power cylinder for concurrently pumping a secondary fluid at a relatively high discharge pressure.
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