| 摘要 |
<p>A check valve (10) comprising a valve body (20) with a bore (22) and a counterbore (52), an insert (24) inside the counterbore (52), a flapper (26) with a flapper pin (36) mounted in a recess (56) in the inside face (70) of the insert (24), means (32) in the conterbore (52) for biasing the flapper (26) toward the closed position, and means for preventing the flapper pin (36) from leaving the flapper pin recess (56) in the inside face (70) of the insert (24) and for preventing the biasing means (32) from leaving the biasing means recess (50) in the counterbore (52). The check valve affords greater reliability, has a reduced tendency to leak, and need not be mounted with the axis of the flapper pin horizontal.</p> |
