Backflow preventer

Details Backflow preventer Backflow preventer

1978-05-30

1980-12-30

Nilson, Robert G.

Fluid handling

Self-proportioning or correlating systems

Supply and exhaust type

137218, F16K 2400

Patent

active

042417520

ABSTRACT:
A backflow preventer comprising a body defining a passage for flow of liquid between a supply pipe and a service pipe, a check valve in the body passage, and a relief valve assembly connected to the body passage downstream of the check valve, the assembly comprising a liquid drainage passage connected to a first port in the body passage, a first valve in the drainage passage, a gas intake passage connected to a second port above the first port in the body passage, and a second valve in the intake passage.

REFERENCES:
patent: 2503424 (1950-04-01), Snyder
patent: 2620816 (1952-12-01), Griswold
patent: 3173439 (1965-03-01), Griswold et al.
patent: 3818929 (1974-06-01), Braukmann
patent: 4090527 (1978-05-01), Sutherland

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