Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1995-01-05
1996-09-03
Hepperle, Stephen M.
Fluid handling
Line condition change responsive valves
Direct response valves
137498, F16K 1730
Patent
active
055514766
ABSTRACT:
A gas line limiter valve is preferably built into a stiffener used to connect gas lines. The valve includes a through-passage having a large bore and a small bore downstream from the large bore, with a conical valve seat between. A central reservoir may be disposed between the large and small bores. A movable float includes a piston disposed within the large bore, a stem disposed within the small bore, and a popper to seal against the valve seat when the float is moved downstream. A coil spring urges the float upstream. The stem and the piston are cylindrical. The piston and large bore form a first orifice, and the stem and small bore form a second orifice. With the second orifice being smaller than the first, the second orifice and the buffer gas inside the reservoir create a resistance to the valve closing during sudden temporary drops in the downstream pressure.
REFERENCES:
patent: 1764181 (1930-06-01), Raetz
patent: 2699799 (1955-01-01), Wager
patent: 3438389 (1969-04-01), Lupin
patent: 3675487 (1972-07-01), Mueller
patent: 3918481 (1975-11-01), Doe et al.
patent: 4874066 (1989-10-01), Silberstein
patent: 4958657 (1990-09-01), Hagan et al.
patent: 5293898 (1994-03-01), Masloff
Dresser Manufacturing Division, Dresser Style 488-XSF Excess Flow Device, Form No. XSF-1090.
Hepperle Stephen M.
Umac Incorporated
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