Dry pipe valve system

Details Dry pipe valve system Dry pipe valve system

1999-03-18

2000-05-30

Weldon, Kevin

Fire extinguishers

Automatic valves

Pressure controlled

169 17, 169 20, A62C 3736

Patent

active

060680571

ABSTRACT:
In the dry pipe sprinkler valve arrangement disclosed in the specification, a dry pipe sprinkler line is normally supplied with air at a pressure in a range from about 5 psi to about 20 psi and is connected through a check valve, a dry pipe valve and a manual control valve to a water supply line. The dry pipe valve has a clapper which is normally retained in the closed position by a latch member. An actuating valve having a diaphragm which receives air pressure from the sprinkler line on one side and engages an orifice to which water from the water supply is applied on the other side permits the latch member to release the clapper when the air pressure falls as a result of opening of a sprinkler in the sprinkler line. When the system is being reset after operation the latch is either automatically movable or manually movable by an external handle to restore the clapper to its seated position without requiring opening of the dry pipe valve housing.

REFERENCES:
patent: 909985 (1909-01-01), Buell
patent: 1790467 (1931-01-01), Griffith
patent: 1796201 (1931-03-01), Heinsman
patent: 3307633 (1967-03-01), Newall
patent: 3464497 (1969-09-01), Globerman et al.
patent: 3587746 (1971-06-01), Venison
patent: 4085765 (1978-04-01), Nelson

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