| 摘要 |
A check valve comprising a casing having a flange extending circumferentially around the inner periphery of the body. The flange is constructed by first drilling from a first direction at a diameter less than the predetermined diameter and then drilling from an opposite direction at the predetermined diameter. The flange defines a valve aperture for receiving a poppet valve. The poppet valve includes a stem including a plurality of legs each having an outer peripheral surface facing the valve aperture. The outer peripheral surface of the valve legs have rounded or recessed edges such that only a center portion of the outer peripheral surface of the legs can come into contact with the inner surface defining the valve aperture.
|
