Shutoff valve and related methods

Details Shutoff valve and related methods Shutoff valve and related methods

2005-05-31

2005-05-31

Chambers, A. Michael (Department: 3753)

Fluid handling

With indicator, register, recorder, alarm or inspection means

Fluid pressure responsive indicator, recorder or alarm

C137S553000, C137S559000, C251S063000, C251S144000

Reexamination Certificate

active

06899129

ABSTRACT:
A shutoff valve includes a positive position indicator for indicating the position of a piston in the valve. The valve position indicator is operably connected to a piston within the valve so that movement of the piston causes a corresponding movement of the valve position indicator. The shutoff valve may also include one or more springs acting on the piston to close the valve. Each spring is independently capable of closing the valve.

REFERENCES:
patent: 3392956 (1968-07-01), De Frees
patent: 3857277 (1974-12-01), Moore
patent: 4009862 (1977-03-01), DeFrees
patent: 4327768 (1982-05-01), Behle
patent: 4934403 (1990-06-01), Mooney et al.
patent: 5235324 (1993-08-01), Gagnebin
patent: 5238022 (1993-08-01), Zink

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