Valve bonnet construction

Claim 1

IN A VALVE CONSTRUCTION, A VALVE BODY HAVING SUBSTANTIALLY FLAT SIDE AND END WALLS, THE END WALLS HAVING ALIGNED OPENINGS FORMING FLOW PASSAGES, A VALVE GATE DISPOSED WITHIN THE BODY AND MOVABLE BETWEEN LIMITING POSITIONS CORRESPONDING TO FULL OPEN AND CLOSED POSITIONS OF THE VALVE, A FLAT FLANGE MOUNTED ON ONE END OF THE BODY, A FLAT BONNET PLATE MOUNTED UPON SAID FLANGE, A CYLINDRICAL BONNET CASING SECURED TO THE OUTER FACE OF SAID BONNET PLATE, A FLAT HEAD PLATE SEATED UPON SAID CASING, BOLTING MEANS REMOVABLY SECURING THE HEAD PLATE TO THE BONNET PLATE WITH THE BONNET CASING CLAMPED THEREBTWEEN AND FOR SECURING THE BONNET PLATE TO THE FLANGE, AN OPERATING ROD, THE HEAD PLATE HAVING AN OPENING TO SLIDABLY ACCOMMODATE THE OPERATING ROD, MEANS FOR SEALING THE OPERATING ROD WITH RESPECT TO THE HEAD PLATE, THE ENDS OF THE BONNET CASING BEING SEALED WITH RESPECT TO BOTH THE HEAD PLATE AND THE BONNET PLATE, AN EXTENSION UPON ONE END OF THE VALVE GATE HWICH IS NEAREST THE OPERATING ROD, SAID EXTENSION HAVING A WIDTH SUBSTANTIALLY LESS THAN THE WIDTH OF THE MAIN PORTION OF THE GATE, AN ELONGATED OPENING IN THE BONNET PLATE DIMENSIONED TO ACCOMMODATE OPENING IN TENSION WHEN THE GATE IS IN ONE OF ITS LIMITING POSITIONS, A SUBSTANTIALLY KEYHOLE-SHAPED SLOT WITHIN SAID EXTENSION, SAID OPERATING ROD BEING LOCATED WITHIN SAID SLOT, A NUT ON THE OPERATING ROD AND DISPOSED WITHIN SAID SLOT AND SERVING TO RETAIN THE OPERATING ROD COUPLED TO THE GATE, SAID NUT FOR SAID ONE LIMITING POSITION OF THE GATE BEING LOCATED IN A REGION EXTERIOR OF THE FLANGE WHEN SAID BONNET PLATE AND SAID CASING AND HEAD PLATE ARE DISCONNECTED FROM THE FLANGE AND REMOVED THEREFROM.