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US08820703B2 Double action directional fluid flow valve 有权
双作用方向流体流量阀

Double action directional fluid flow valve
Abstract:
A double action directional fluid flow valve includes a stepped piston connected with a poppet valve and moveable by a controller between open and closed positions by applying a continuous pressure to a small diameter piston face and selectively applying and removing pressure from a large diameter piston face to move the poppet valve between an open position and a closed position.
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