Multistage switching valve, two-stage switching valve, and toggle type two-stage switching valve
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jun 12, 2001
Grant Date -
N/A
app pub date -
May 4, 2000
filing date -
May 12, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A multistage switching valve includes a valve stem which is adapted to open or close a fluid passage, a biasing biasing means for biasing the valve stem in a direction to close the fluid passage, a plurality of pistons which are relatively slidably fitted onto the valve stem at different axial positions to provide different flow rates, a plurality of stops which are provided on the valve stem to move the valve stem in a valve opening direction opposite to the direction of the movement of the valve stem caused by the biasing biasing means, together with the pistons when the pistons are moved in the valve opening direction, a valve opening means for exerting a pilot pressure in the valve opening direction on each piston, and a flow rate controller for individually restricting the axial displacements of the pistons in the valve opening direction. A two-stage switching valve and a toggle type two-stage switching valve are also disclosed.
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