Fluid actuated valve

Claim 1

A VALVE INCLUDING A HOUSING HAVING A BORE EXTENDING THERETHROUGH, A TUBULAR PISTON RECIPROCAL IN AND COMMUNICATING WITH THE BORE, A CYLINDER IN SAID BORE AND SURROUNDING A PORTION OF THE PISTON, MEANS FOR ADMITTING AND DISCHARGING PRESSURE FLUID TO AND FROM THE CYLINDER FOR ACTUATING SAID PISTON, AN ANNULAR BEVELLED VALVE SEAT IN SAID BORE AND SPACED FROM THE DOWNSTREAM END OF SAID PISTON, A PLURALITY OF VALVE SEGMENTS RECIPROCAL WITH SAID PISTON AND EXTENDING BETWEEN THE VALVE SEAT AND SAID PISTON END, THE SEGMENTS HAVING COMPLEMENTARY OUTER END PORTIONS FOR ENGAGEMENT WITH SAID SEAT AND ONE ANOTHER, SAID SEGMENTS BEING PIVOTALLY CONNECTED TO SAID PISTON END FOR LATERAL PIVOTAL MOVEMENT TO ENGAGE AND DISENGAGE THEIR OUTER END PORTIONS AND HAVING THEIR INNER END PORTIONS EXTENDING UPSTREAM PAST THEIR PIVOTAL CONNECTIONS, AN INCLINED ABUTMENT SURFACE IN SAID BORE ADJACENT SAID SEAT AND ENGAGEABLE BY THE OUTER END PORTIONS OF SAID SEGMENTS TO PIVOT SAID OUTER END PORTIONS INWARDLY INTO ENGAGEMENT WITH SAID SEAT AND ONE ANOTHER UPON DOWNSTREAM RECIPROCATION OF SAID PISTON TOWARD SAID SEAT, AND AN ANNULAR ABUTMENT MEMBER IN SAID BORE ADJACENT THE DOWNSTREAM END OF SAID PISTON AND HAVING AN INTERNAL INCLINED SURFACE ENGAGEABLE BY THE EX-