Valve attachment

Claim 1

A valve attachment for use on a tubular valve holder, which valve attachment comprises a tubular structure defining a cylindrical prismatic cavity, a cup-shaped diaphragm sealing said cylindrical prismatic cavity from a short tubular portion at one end of said tubular structure, said short tubular portion connects said one end of said tubular structure to said valve holder whereby said diaphragm is subjected to predetermined pressure acting through said valve holder upon the engagement of said tubular portion with said valve holder to cause the transmission of said predetermined air pressure from within said valve holder into said valve attachment, a cap formed with a central opening and screwed on said tubular structure at the other end thereof, a plunger slidably guided in said cylindrical prismatic cavity and provided with an extension on its free end face, with a rounded surface at its other end, and with a plunger flange positioned near said other end, a spring positioned between the inside top surface of said cylindrical prismatic cavity and said plunger flange urging said rounded surface of the plunger into direct engagement with and for deformation of said diaphragm in the direction of the expansion of said spring whereby said air under predetermined pressure released thru the valve holder depresses said spring and moves said plunger in the direction of said free end face thereof, thereby positioning said plunger in response to said predetermined pressure, said cap being threadedly adjustable whereby the top of said cap can be aligned flush with said free end face of the plunger that has been positioned in response to said predetermined pressure, said valve attachment being responsive to changes in pressure from the predetermined pressure, whereby said top of the cap becomes out-of-flush with said free end face of the plunger, said cup-shaped diaphragm includes a diaphragm flange about the open circumferential end thereof, said short tubular portion has a flange about the circumferential end thereof opposite said tubular valve holder, said diaphragm flange and the flange of the tubular portion are in abutting engagement with each other between a ring and a seal, one surface of said ring is in abutting engagement with said diaphragm flange, the other surface thereof is in abutting engagement with the circumferential face end of said cylindrical prismatic cavity opposite said cap, and one surface of said seal is in abutting engagement with said flange of the tubular portion and the other surface is in abutting engagement with a sealing sleeve circumferentially surrounding a portion of said short tubular portion.