| 摘要 |
<p>A valve body having a lateral exhaust port is provided with a valve movable toward and away from a fluid inlet sealing face at its pressure connected end and guided by a valve stem projecting through the other end of the body and terminating in spaced relation with respect to a cap closing the end of the body opposite its inlet port. An axially collapsible member is axially interposed between the downstream end of the valve stem and the cap to normally maintain the flow passageway between the ports closed. Excessive fluid pressure against the valve at the inlet port collapses the collapsible member, unseats the valve and opens the fluid discharge passageway.</p> |
