| 摘要 |
A pressure-responsive valve unit is received in the cavity of a valve assembly housing (4), the inner end of the cavity being connected (via 7) with a fluid container. The valve unit includes a main body (16) having a chamber containing a check valve member (19) which is movable towards and away from engagement with a valve seat (31) on the main body, the valve seat facing an abutment surface (26) on the check valve member. The main body has passages (33) communicating fluid from the container to the front end portion of the check valve member. The check valve member is biased into engagement with the valve seat by a spring (20), the force of which is adjustable with a plug (21) threaded into the inner end of the main body chamber. An outlet bore (30) extends from the outer end of the main body to the valve seat, and the check valve member can be engaged by a push rod inserted through said outlet bore to open the valve manually. Alternatively the valve unit may include a cam and pin mechanism permitting manual opening of the valve by rotation of the valve member, Fig. 8 (not shown). <IMAGE> |
