Pressure relief actuated valves

摘要

An embodiment of a valve that is operable from one position to another position upon relief of an applied pressure includes a housing having a bore; a valve member 5 disposed with the housing, wherein the valve member is actuated to one position in response to a certain applied pressure and actuates toward another position upon relief of the certain applied pressure; and a relief system relieving the pressure applied to the valve member when 10 the applied pressure falls below a selected pressure level. N:/Melbourne/Cases/Patent/81000-81999/P1408.AU/Specis/P81408.AU GH SPECI.doc 1/07/09