Document Type and Number:
Japanese Patent JPS6115311
Kind Code:
B2
Abstract:
A back flow preventing device which prevents the reverse flow of water from a point of use into a water supply system. The device has a casting with coaxially aligned inlet and outlet openings, and containing coaxially aligned inlet and outlet check valves. The coaxial alignment of the inlet and outlet openings, and of the inlet and outlet check valves serves to minimize the pressure drop through the device. Between the inlet and outlet check valves is a diaphragm actuated relief valve which opens to drain the passage between the check valves if they should malfunction or if there is a drop in the supply line pressure sufficient to cause actual or potential reverse flow back toward the supply line.
Inventors:
BAANAADO BII BETSUKAA
JON KEI BAUMAN
SHIRIRU EI RANDOORU
JON KEI BAUMAN
SHIRIRU EI RANDOORU
Application Number:
JP3510079A
Publication Date:
April 23, 1986
Filing Date:
March 27, 1979
Export Citation:
Assignee:
AMTROL INC
International Classes:
F16L29/00; E03C1/10; F16K11/10; F16K15/00; F16K15/06