Pilot air operated valve

Claim 1

IN A VALVE CONSTRUCTION HAVING A VALVE BODY DETACHABLY MOUNTED ON A BASE, THE COMBINATION OF, AN ANNULAR END CHAMBER IN EACH END OF SAID VALVE BODY; AN ELONGATED MASTER SPOOL SLIDABLY MOUNTED IN SAID VALVE BODY FOR CONTROLLING THE FLOW OF FLUID THROUGH THE VALVE; SAID MASTER SPOOL HAVING ENLARGED ENDS WHICH ARE SLIDABLY MOUNTED IN THE INNER ENDS OF THE ANNULAR END CHAMBERS SO AS TO SLIDABLY ENGAGE THE INTERIOR SURFACE THEREOF; A CUSHION RETAINER MOUNTED IN THE OUTER END OF EACH OF THE ANNULAR END CHAMBERS TO ENCLOSE THE OUTER ENDS THEREOF; A CUSHION MEMBER CARRIED ON THE INNER SIDE OF EACH OF SAID CUSHION RETAINERS; A CUSHION TRANSFER ELEMENT CARRIED ON EACH OF SAID CUSHIONS FOR STOOPING IMPACT WITH THE MASTER SPOOL WHEN IT IS SHIFTED FROM ONE END OF THE VALVE BODY TO THE OTHER, FOR TRANSFERRING THE STOPPING IMPACT OF THE MASTER SPOOL TO THE CUSHION; AND, MEANS FOR SELECTIVELY CONDUCTING PRESSURE FLUID INTO EACH OF SAID END CHAMBERS FOR SHIFTING SAID MASTER SPOOL.