Pressure controlled pilot valve operating device

Claim 1

A PRESSURE CONTROLLED PILOT VALVE OPERATOR COMPRISING AN EXPANSIBLE CHAMBER DEVICE HAVING A MOVABLE WALL MEMBER MOVABLE BETWEEN FIRST AND SECOND POSITIONS, A VALVE OPERATING MEMBER ADAPTED TO BE MOVED BY SAID WALL MEMBER, MEANS BIASING SAID WALL MEMBER TO SAID FIRST POSITION, A CONNECTION FOR TRANSMITTING FLUID UNDER PRESSURE INTO SAID DEVICE AND HOLDING SAID WALL MEMBER AGAINST THE BIAS OF SAID BIASING MEANS IN SAID SECOND POSITION, A CATCH MEMBER MOVABLE WITH SAID WALL MEMBER, DETENT MEANS BIASED TOWARDS AND MOVABLE INTO ENGAGEMENT WITH SAID CATCH MEMBER UPON MOVEMENT OF SAID WALL MEMBER FROM ITS SECOND TO ITS FIRST POSITION, AND LOCK MEANS AUTOMATICALLY OPERABLE TO LOCK SAID DETENT MEANS INTO ENGAGEMENT WITH SAID CATCH MEMBER UPON MOVEMENT OF SAID DETENT MEANS INTO ENGAGEMENT WITH SAID CATCH MEANS TO POSITIVELY RESTRAIN MOVEMENT OF SAID WALL MEMBER FROM ITS FIRST TO ITS SECOND POSITION BY SAID FLUID UNDER PRESSURE.