Excess flow valve

Details Excess flow valve Excess flow valve

2005-03-21

2008-07-15

Lee, Kevin L (Department: 3753)

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

C137S460000, C137S529000, C137S517000, C251S129020

Reexamination Certificate

active

07398795

ABSTRACT:
An excess flow valve includes: a valve that opens and closes a flow path; a solenoid that keeps the valve in an opened state; a pressure detector detecting the primary-side pressure of the valve; and a controller controlling current flow to the solenoid based on pressure detected by the pressure detector so that the valve is closed when the flow rate supplied to the valve is at or more than a predetermined amount. The excess flow valve can be used in a wide variety of applications and prevents a flow of fluid at or greater than a desired flow rate even if the primary-side supply pressure varies.

REFERENCES:
patent: 3628563 (1971-12-01), Tomita
patent: 3952759 (1976-04-01), Ottenstein
patent: 5152309 (1992-10-01), Twerdochlib et al.
patent: 5287884 (1994-02-01), Cohen
patent: 5813429 (1998-09-01), Ohtaka et al.
patent: 6209576 (2001-04-01), Davis
patent: 6634373 (2003-10-01), Nilsen et al.
patent: 6652240 (2003-11-01), Wichert
patent: 6938637 (2005-09-01), McGill et al.
patent: 2002/0014277 (2002-02-01), Togasawa et al.
patent: 2002/0029804 (2002-03-01), Liorati et al.
patent: 2002/0113219 (2002-08-01), Rembold et al.
European Search Report for EP 05 00 6448 dated Jul. 19, 2005.

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