| 摘要 |
Coaxial bidirectional flow control and relief valves are provided especially suited for use in hydrostat systems containing a filter or filters interposed between a pump and a hydraulic motor, to direct flow in one direction through a filter, and to direct flow in the opposite direction to bypass the filter. The valves are space-saving, can be kept closed under low biasing forces, and can be made light in weight, affording a low-mass valve that can be moved in milliseconds from a closed to an open position. The valves can control not only bidirectional forward and reverse flow paths but also a relief path for flow to bypass a filter which is clogged. When two valves are used, unidirectional flow through can be achieved regardless of direction of flow in the fluid line.
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