Alarm check valve

Details Alarm check valve Alarm check valve

1985-09-13

1986-07-08

Cohan, Alan

Fluid handling

Line condition change responsive valves

Direct response valves

137557, 137875, 285412, F16K 1503, F16K 3700, F16L 2302

Patent

active

045987343

ABSTRACT:
An alarm check valve has a tubular body arranged to fit within a pipe line, such as of a sprinkler system. The valve member is pivoted within the body so as to permit one way flow, and is spring biased towards the closed position. A secondary outlet port is normally covered by the closed valve member. When the valve is opened and fluid is flowing, some fluid can flow out the secondary port to operate an alarm.

REFERENCES:
patent: 1211500 (1917-01-01), Strong
patent: 1514090 (1924-11-01), Lewis
patent: 1842381 (1932-01-01), Angell
patent: 3395727 (1968-08-01), Weise et al.
patent: 3612097 (1971-10-01), Prince
patent: 3693652 (1972-09-01), Iung
patent: 3817277 (1974-06-01), Wheatley
patent: 3835878 (1974-09-01), Braidt et al.
patent: 3905392 (1975-09-01), Gray
patent: 4128111 (1978-12-01), Hansen et al.

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