Fluid handling – Line condition change responsive valves – Bi-directional flow valves
Patent
1995-11-30
1996-10-15
Moulis, Thomas N.
Fluid handling
Line condition change responsive valves
Bi-directional flow valves
123518, F02M 3302, F16K 1726
Patent
active
055644660
ABSTRACT:
A negative pressure cut valve disposed between a feed pipe and a forward pipe includes a main body having a first outer wall and a second outer wall, an urging spring provided on the first outer wall, a diaphragm provided on the main body and actuated by the relative action of the force of the urging spring and the inner pressure on the feed pipe side to produce an opening action in the state in which the inner pressure on the feed pipe side rises is above the inner pressure on the forward pipe side and a closing action in the other pressure state, and a valve provided on the main body and actuated to produce an opening action in the state in which the inner pressure on the feed pipe side falls below the inner pressure on the forward pipe side and a closing action in the other pressure state. The first outer wall has a first atmospheric vent formed therein. The second outer wall is disposed around the periphery of the first atmospheric vent and enabled jointly with the first outer wall to define an empty space for precluding intrusion of extraneous substances. The empty space has a capacity at least above an operating capacity of the diaphragm. The second outer wall has a second atmospheric vent formed therein and endowed with a function of releasing pressure and a function of discharging water.
REFERENCES:
patent: 4391294 (1983-07-01), Aubel
patent: 5090393 (1992-02-01), Holch
patent: 5188141 (1993-02-01), Cook et al.
Aoyama Taiki
Hirata Nobuhiro
Katoh Kouichi
Matsuo Shinichi
Sugiyama Harumitsu
Moulis Thomas N.
Nissan Motor Co,. Ltd.
Piolax Inc.
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