Excess flow valve

Claim 1

A VALVE COMPRISING, IN COMBINATION, A GENERALLY CYLINDRICAL METAL CASING, ONE END OF SAID CASING BEING CONSTRUCTED AND ARRANGED TO DEFINE A VALVE SEAT, THE OTHER END OF SAID CASING DEFINING A HOUSING FOR A VALVE HEAD ASSEMBLY, A SPIDER SECURED INTERIORLY OF SAID HOUSING, A VALVE HEAD ASSEMBLY INCLUDING A TUBULAR STEM MOUNTED FOR AXIAL MOVEMENT IN SAID SPIDER TOWARD AND AWAY FROM SAID VALVE SEAT, A VALVE HEAD SECURED TO SAID STEM, AND A SPRING URGING SAID VALVE HEAD TO A POSITION SPACED FROM SAID VALVE SEAT, AT WHICH POSITION A FLUID PRESSURE DIFFERENTIAL CREATED BY AN EXCESS FLOW OF FLUID FROM THE HOUSING TOWARD SAID ONE END OF THE CASING IS ADAPTED TO FORCE SAID VALVE HEAD INTO ENGAGEMENT WITH SAID VALVE SEAT AGAINST THE FORCE OF SAID SPRING, A PLUNGER MOUNTED FOR AXIAL MOVEMENT WITHIN SAID STEM, A PISTON ROD SECURED TO SAID PLUNGER, A PISTON SECURED TO SAID ROD WHICH IS MOVABLE LONGITUDINALLY IN A PISTON CHAMBER DEFINED BY SAID CASING, A LINE COMMUNICATING WITH SAID CHAMBER TO ADMIT HYDRAULIC FLUID THERETO, THEREBY TO MOVE SAID PISTON IN SUCH DIRECTION AS TO CAUSE THE PLUNGER TO LIFT THE VALVE HEAD AWAY FROM THE VALVE SEAT, A VALVE CONTROL MEMBER MOVABLY MOUNTED IN SAID CASING, A BLEED PORT COMMUNICATING WITH SAID PISTON CHAMBER AND CONTROLLED BY THE POSITION OF SAID MEMBER TO BLEED HYDRAULIC FLUID FROM THE PISTON CHAMBER, SAID MEMBER HAVING A PROTRUDING ARM, A PROTRUDING ARM SECURED TO SAID PISTON AND COOPERATING WITH SAID FIRST ARM TO FORM A LOST MOTION CONNECTION THEREWITH, AND MEANS FRACTIONALLY ENGAGING SAID MEMBER, SAID STRUCTURE BEING ARRANGED SO THAT MOVEMENT OF THE PISTON IN SUCH DIRECTION TO LIFT THE VALVE HEAD CAUSES SAID MEMBER TO OPEN SAID BLEED PORT, THE PISTON ENGAGING SAID FIRST ARM UPON A PREDETERMINED RETURN MOVEMENT OF THE PISTON IN ORDER TO CAUSE SAID MEMBER TO CLOSE THE BLEED PORT WHEN THE PISTON REACHES A PRESELECTED POSITION.