| 摘要 |
<p>A high-pressure fluid control valve (10) is disclosed for operating a fluid-actuated device. Preferably a ball-poppet (42,52) and frusto-conical valve seat (36,46) adapted for substantially line-type contact therebetween are provided with an upstream restricted flow area in order to substantially minimize sonic flow damage to the actual sealing surface of the valve seat (34,46). Preferably, the ball-poppet (42,52) is movable within a poppet guide (62,72) that is allowed to float radially in order to allow the ball-poppet (42,52) to be substantially self-centering with respect to the valve seat (34,46). In addition, crossover leakage is preferably negated by closing an exhaust ball-poppet (52) just prior to opening a supply ball-poppet (42). <IMAGE></p> |
