Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1995-12-01
1996-12-17
Michalsky, Gerald A.
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
137107, F16K 2400, E03C 110
Patent
active
055843131
ABSTRACT:
A valve for use in a fluid flow line comprises a housing having a piston chamber with a inlet, outlet, and a vent. An annular outer piston defining a central fluid flow opening is disposed in slidable sealing contact with the housing within the chamber. An inner piston extends axially through the central opening of the outer piston for relative axial movement and is movable in an axial direction between a first position, in which the inner piston blocks the inlet from the chamber, and a second position, in which the inner piston seals the vent from fluid communication with the chamber. The inner and outer pistons, furthermore, are movable relative to each other between an engaged condition, in which the outer piston engages the inner piston to seal the central opening thereof, and a disengaged condition, in which the central opening of the outer piston is open to fluid flow therethrough. A first resilient spring urges the inner and outer pistons into the engaged condition for blocking fluid communication of the inlet with both the outlet and the vent and yields to a first predetermined fluid pressure for forcing the inner and outer pistons into the disengaged condition. A second resilient spring urges the inner piston into the first position and yields to a second predetermined fluid pressure in the inlet for displacing the inner piston into the second position. Preferably, the second predetermined fluid pressure is less than the first predetermined fluid pressure.
REFERENCES:
patent: 3498056 (1970-03-01), Avery
patent: 4508137 (1985-04-01), Bolgert
patent: 5125429 (1992-06-01), Ackroyd et al.
Conbraco Industries, Inc.
Michalsky Gerald A.
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