Diaphragm valve with venting apertures in body

Claim 1

A VALVE COMPRISING A BODY HAVING INLET AND OUTLET PORTS FORMED THEREIN; A GENERALLY CYLINDRICAL VALVE CHAMBER IN SAID BODY INTERCONNECTING SAID PORTS AND INCLUDING A SEALING SEAT; A BONNET SECURED TO SAID BODY; A CENTRAL BORE IN SAID BONNET DEFINED BY A CYLINDRICAL SIDE WALL AND AN END WALL; THE BORE IN SAID BONNET BEING GENERALLY COAXIAL WITH AND OPENING TOWARD THE VALVE CHAMBER IN THE BODY; A VALVING MEMBER COMPRISING A VALVE HEAD SILDABLY RECEIVED IN SAID VALVE CHAMBER IN BOTH THE OPEN AND CLOSED POSITIONS OF SAID VALVE, AND A VALVE STEM EXTENDING THROUGH THE CENTRAL BORE IN SAID BONNET AND SLIDABLY RECEIVED THROUGH A BORE PROVIDED IN SAID END WALL WITH THE FREE END OF THE VALVE STEM EXTENDING THEREBEYOND; A FLEXIBLE DIAPHRAGM MEMBER SECURED TO THE VALVE STEM ADJACENT THE FREE END THEREOF AND BEING PROTECTED BY SAID END WALL FROM ANY ESCAPING PROCESS FLUID; A CAP MEMBER ENCLOSING SAID DIAPHRAGM AND SECURED TO SAID BONNET WITH THE PERIPHERAL PORTIONS OF SAID DIAPHRAGM BEING CLAMPED BETWEEN THE CAP MEMBER AND SAID BONNET; AN ANNULAR CHAMBER IN SAID BONNET CONCENTRIC WITH SAID CENTRAL BORE AND SEPARATED THEREFROM BY THE SAID SIDE WALL; SAID ANNULAR CHAMBER OPENING IN THE DIRECTION OPPOSITE THE DIRECTION IN WHICH THE CENTRAL BORE IN THE BONNET OPENS; SPRING MEANS IN SAID ANNULAR CHAMBER WITH ONE END OF SAID SPRING MEANS OPERATIVELY INTERCONNECTED WITH SAID DIAPHRAGM THEREBY BIASING SAID DIAPHRAGM AND SAID STEM IN ONE DIRECTION; FLUID PASSAGE MEANS IN SAID CAP MEMBER WHEREBY FLUID PRESSURE MAY BE INTRODUCED AGAINST SAID DIAPHRAGM THEREBY TO OVERCOME THE BIAS OF SAID SPRING MEANS; A FIRST VENTING APERTURE THROUGH THE SIDE WALL SEPARATING SAID CENTRAL BOER FROM SAID ANNULAR CHAMBER AND DISPOSED BETWEEN THE VALVE HEAD AND THE END WALL OF THE BORE IN THE BONNET; AND A SECOND APERTURE IN SAID BONNET VENTING SAID ANNULAR CHAMBER TO THE ATMOSPHERE.