Backflow prevention devices

Details Backflow prevention devices Backflow prevention devices

1976-07-30

1979-01-02

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

137542, F16K 1506

Patent

active

041322460

ABSTRACT:
A backflow prevention device is disclosed which includes a spring operated check valve and a shielding member for protection of the spring from transverse fluid flow disturbances. The shielding member is preferably cylindrical in shape and surrounds the spring longitudinally about 40% to 90% of the extended spring length.

REFERENCES:
patent: 569884 (1896-10-01), Parker
patent: 1519856 (1924-12-01), Lorraine
patent: 1651778 (1927-12-01), Rice
patent: 1676666 (1928-07-01), Pivoto
patent: 1767538 (1930-06-01), Mahan
patent: 2619115 (1952-11-01), Dondero
patent: 3688794 (1972-09-01), Bird

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