EROSIONSBESTÄNDIGES HOCHDRUCKENTLASTUNGSVENTIL

摘要

A high pressure relief valve for use in a high pressure fluid pump is shown and described. In a preferred embodiment, a valve seat (12) is provided with a tapered hole (14) and with a conduit (16), the tapered hole (14) and conduit (16) being in fluid communication with each other and with fluid having a variable pressure. A tapered pin (18) having grooves (24) is held in the tapered hole (14) by a control force (32), or control pressure acting through a plunger (40). When the pressure of the fluid is sufficiently high to overcome the control force or pressure, the tapered pin (18) is forced to move sufficiently to create an annular clearance between the tapered pin (18) and the tapered hole (14), thereby allowing pressurized fluid to flow past the pin to an outlet (20). An outer surface of the valve seat (12) in a region of the tapered pin (18) is tapered in an opposite direction to that of the tapered hole (14), thereby weakening the valve seat (12) in that region, such that the tapered hole is able to expand and contract as the pressure of the fluid increases and decreases.