Passively actuated valve

Details Passively actuated valve Passively actuated valve

2005-09-20

2005-09-20

Krishnamurthy, Ramesh (Department: 3753)

Fluid handling

Line condition change responsive valves

Direct response valves

C137S494000, C376S283000

Reexamination Certificate

active

06945272

ABSTRACT:
A passively actuated valve for isolating a high pressure zone from a low pressure zone and discontinuing the isolation when the pressure in the high pressure zone drops below a preset threshold. If the pressure in the high pressure zone drops below the preset threshold, the valve opens and allows flow from the high pressure zone to the low pressure zone. The valve remains open allowing pressure equalization and back-flow should a pressure inversion between the two pressure zone occur.

REFERENCES:
patent: 2574414 (1951-11-01), Ragland
patent: 3636969 (1972-01-01), Jacobellis
patent: 4363780 (1982-12-01), Hannerz
patent: 4570669 (1986-02-01), Pauliukonis
patent: 5154876 (1992-10-01), Ehrke et al.
patent: WO 95/24719 (1995-09-01), None

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