US 6,196,523 B1 · Stop valve

Abstract

A housing (2) has an upper portion engaged with a cylindrical stopper member (20) in screw-thread fitting so as to be able to vertically advance and retract the stopper member (20). The stopper member (20) has an outer thread (20a) engaged with a nut member (21) and has an inner thread (20b) engaged with a thrust screw member (23) each in screw-thread fitting. The stopper member (20) has a stopping portion (A) which prevents the downward movement of the intermediate transmission member (25) connected to the thrust screw member (23) over a predetermined distance. This inhibits a metal diaphragm (12) from being excessively pushed to a valve seat (15). When further moving the diaphragm (12) for valve closing, the nut member (21) is loosened and at the same time the stopper member (20) is advanced downwards to thereby define a gap between a receiving portion (B) of the intermediate transmission member (25) and the stopping portion (A).

Claims11

Dependent claims

A stop valve adapted to bring a closure member (12) into closing contact with a valve seat (15) by a thrust of an output portion (27) connected to a thrust screw member (23), which results from advancing the thrust screw member (23) to a housing (2) through a tightening rotation of a handle (26), the stop valve comprising:

a stopper member (20) provided between the housing (2) and a valve-closing thrust transmission system (T) which extends from the handle (26) to the output portion (27);
and
a switching-over device (30) for switching over the stopper member (20) to a stopping condition (X) which prevents the output portion (27) from further moving for valve closing over a predetermined distance and to a stop cancelling condition (Y) which allows the output portion (27) to further move for valve closing over the predetermined distance.

Dependencies are inferred from the claim text.

Stop valve

Life of this patent

Stop valve

Life of this patent

Abstract

Claims11