| 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 auxiliary channels for self cleaning. The check valve may also include a valve seal. In one embodiment, the valve seal is an o-ring received by a poppet head, based of the poppet guide and valve seat. The valve seat and/or the base may include expansion channels to receive a portion of the valve seat during compression when the check valve is in a closed position. |
| 主权项 |
1. A check valve for use in a housing, wherein the housing includes an inner peripheral surface defining a passage there through between an inlet and an outlet, said check valve comprising:
a valve seat ring attachable to the housing, 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 arm 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; 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 head being resiliently biased in the closed position against the valve seat, 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 as the poppet moves between the closed position to 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, and wherein a third portion of the outer peripheral surface of the head extending circumferentially around the head tapers outward; and a valve seal, said valve seal received by the valve seat and the base of said poppet guide to form a seal with the third portion of the outer peripheral surface of the head of said poppet when the check valve is in the closed position. |
