Check valve

摘要

A check valve is provided for use with variable frequency drives and other applications. In one aspect, the check valve provides a poppet guided by a poppet guide in at least two locations to ensure stability between fully open and fully closed positions. In another aspect, the check valve includes a poppet guide adapted to receive a poppet in a stem receiving channel, the stem receiving channel including guide vanes engaging the poppet and auxilliary channels for self cleaning.

主权项

1. A check valve for use in a housing, wherein the housing includes an inner peripheral surface defining a flow path there through between an inlet and an outlet, said check valve comprising:
a valve seat ring attachable to the housing in the flow path, said valve seat ring defining a valve seat; a poppet guide, said poppet guide including a base attachable to the valve seat ring, a stem guide, and at least three support legs extending between the base and the stem guide, each support leg including an inner peripheral surface, the stem guide including an inner surface defining a stem receiving channel, wherein at least three stem guide vanes extend radially inward from the inner surface of the stem guide into the stem receiving channel; and a poppet, said poppet being moveable between a closed position against the valve seat to a fully open position, said poppet including a stem connected to a head, the stem being telescopically received by the at least three stem guide vanes in the stem receiving channel of the stem guide, the head including an outer peripheral surface, wherein at least a first portion of the outer peripheral surface of the head extending circumferentially around the head engages the inner peripheral surfaces of the at least three support legs of said poppet guide in at least one position of the poppet between the closed position and the fully open position, wherein a second portion of the outer peripheral surface of the head extending circumferentially around the head engages the valve seat in the closed position of the poppet, the head being resiliently biased in the closed position against the valve seat to mechanically support the head of the poppet, and the first and second portions of the outer peripheral surface of the head of the poppet being differing portions, wherein a seal is positioned on the valve seat ring, the seal engaging a third portion of the outer peripheral surface of the head of the poppet when the head is in the closed position that differs from the second portion of the head that engages the valve seat when the head is in the closed position, and wherein the head of the poppet is disengaged from the poppet guide when the poppet is in the closed position.