Manually operable elastic spring and valve member

Claim 1

In a valve of the character described, a casing, said casing having an opening extending therethrough, said opening being defined in part by two spaced shouldered portions interconnected by a cylindrical portion with one of said shouldered portions serving as a valve seat, said casing having a second opening therein defining an inlet opening and being in communication with the first opening at a region between said spaced shouldered portions, an elastic valve member having two spaced flanged portions interconnected by a cylindrical portion with one of said flanged portions being in engagement with said one shouldered portion and with the other flanged portion being in engagement with the other shouldered portion of said casing and maintaining said valve member in tension, said flanged portions having equal areas exposed to pressure in said inlet opening, and means for moving said one flanged portion from its engagement with said one shouldered portion, said casing between said spaced shouldered portion defining a leakproof chamber for confining fluids applied under pressure to said inlet opening, said valve member being under sufficient tension to maintain said spaced flanged portion against said spaced shouldered portions to maintain said chamber leakproof, said plate-shaped element being integrally formed with said casing cylindrical portion with the plane of said plateshaped element being generally parallel with the axis of said casing cylindrical portion, said platelike element having three notched portions one of which is adjacent said moving means to allow access to the same and to provide steadying of a person''s finger operating said means, the other two of said notched portions being on opposite sides of said casing cylindrical portion.