Zero leakage valve

Details Zero leakage valve Zero leakage valve

1986-11-26

1988-04-19

Cohan, Alan

Fluid handling

Line condition change responsive valves

With separate connected fluid reactor surface

137509, 1375123, 13763022, 251 634, 251 635, 251210, 251900, F16K 1518, F16K 31363

Patent

active

047382821

ABSTRACT:
A valve having dual seats and dual poppets operating in series to function as either a conventional check valve, or may be operated by an independent piston which may be styled to either combine or eliminate the check valve feature. One seat poppet combination employes a metal-to-metal seal. The other seat poppet combination utilizes a resilient o-ring seal vented so that when the seal is raised from the bottom of its groove, the upstream and downstream sides of the soft seat poppet can communicate. Alternative embodiments provide a family of zero leakage valves for different purposes, e.g. a check valve, pilot operated check valve, and an in line or balanced relief valve with or without the check valve feature by employing generally the same elements with modifications.

REFERENCES:
patent: 1834276 (1931-12-01), Hallett
patent: 2271274 (1942-01-01), O'Donnell
patent: 3092135 (1963-06-01), Brown et al.
patent: 3391897 (1968-07-01), Wilson
patent: 3951381 (1976-04-01), Whitener
patent: 4013093 (1977-03-01), Pensa
patent: 4172469 (1979-10-01), Boehringer

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