2 Alarm valve for firefighting comprising secondery overpressure preventing structure

摘要

A fire alarm valve incorporating a secondary side overpressure prevention structure is disclosed. The fire alarm valve according to the present invention normally maintains the same water pressure on the primary side and the secondary side of the valve, and when the fire is generated, the secondary side sprinkler head is ruptured and the water discharge port is opened, A clapper (10) for opening and closing the valve seat (100) between a primary side and a secondary side, and a clamper (10) for passing through one side of the clapper A valve body 12 which is fixed to the valve body 102 by being inserted and fixed in the valve body 102 and which is opened to a size of a first diameter D1 on the upper surface of the valve body 12, A through hole 14 formed to pass through the bottom of the clapper 10 at a size of a second diameter D2 larger than the first diameter D1 and extending through the through hole 14, When the outer diameter is the first diameter (D1) And when the secondary side water pressure is larger than the primary side water pressure in a state where the clapper 10 is closed normally, it is lowered to discharge the overpressure to the primary side, and when the primary side water pressure is larger than the secondary side water pressure Of the through hole (14) so as to prevent the primary side water pressure from being discharged to the secondary side by closing the through hole (11) only when the opening / closing member (16) And a pin 18 disposed at the lower portion of the pin.