Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent
1997-11-26
1999-08-24
Hepperle, Stephen M.
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
137509, F16K 1704
Patent
active
059412763
ABSTRACT:
The invention relates to a starting valve for progressive build-up of pressure in an installation through which pressure medium flows, in which a piston is movable to and fro in a housing between a closed and an open position. Means are also provided for maintaining a low flow of pressure medium--while the piston is in the closed position--between a region with high pressure on one side of the valve seat and a region with pressure building up on the other side of the valve seat. The piston has action surfaces which are exposed to the high pressure or to the pressure building up end which generate force components which push the piston into its open or closed position. The piston moving into the open position when the difference between the high pressure and the pressure building up falls below a threshold value. In the housing one region with high pressure and two regions with pressure building up are provided, the latter being connected to one another by way of a channel disposed in the piston.
REFERENCES:
patent: 4192346 (1980-03-01), Iizumi
patent: 4652216 (1987-03-01), Eslinger et al.
patent: 5052433 (1991-10-01), Levenez
Hepperle Stephen M.
Press Controls AG Rumlang
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