Fluid handling – Larner-johnson type valves; i.e. – telescoping internal valve... – Line condition change responsive
Reexamination Certificate
2006-05-09
2006-05-09
Fox, John (Department: 3753)
Fluid handling
Larner-johnson type valves; i.e., telescoping internal valve...
Line condition change responsive
C137S881000, C251S083000
Reexamination Certificate
active
07040339
ABSTRACT:
A suction inlet valve for fire truck pumpers has a male body portion and a female body portion, the portions defining a chamber therein. A cone-shaped valve element is connected to a valve stem which has a cam body thereon with a cam slot therein. The cam slot receives a projection from an operating shaft which projects out of the housing. The operating shaft has an operating handle thereon which is exposed to the environment and conducts heat from the chamber. If there is water in the chamber, there is an increased chance of water in the cam slot freezing disabling operation of the valve. To drain water away from the cam slot, a drain is provided in the male body portion for draining water from the chamber.
REFERENCES:
patent: 1944249 (1934-01-01), Lencke
patent: 4580596 (1986-04-01), Stehling
patent: 5178185 (1993-01-01), Stehling et al.
Fox John
Hydra-Shield Manufacturing Inc.
Millen White Zelano & Branigan P.C.
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