FIRE VALVE Russian patent published in 2015 - IPC F16K17/38 

FIELD: fire safety.

SUBSTANCE: fire valve with inlet and outlet holes comprises the spring-loaded locking element and a retainer mounted in the internal cavity of the housing perpendicular to each other and interacting with each other, and a fused part and the gas discharge holes. The valve is provided with a seat with an internal hole communicating with the outlet hole of the valve and mounted coaxially with the locking element in the form of a piston with the hole. The seat is made in the form of a cylinder of variable cross section with consequent reduction in the diameters towards the locking element. The retainer is made in the form of a cylinder of variable cross section, one end of which is mounted in the piston hole, and the other end is made in the form of a disc spring-loaded at the side of a piston, fixed by the fused part of the form of the disc. The surfaces of the seat and piston facing each other are fitted with a metal cutting edge. The length of the retainer part which interacts with the piston is smaller than the height of the fused part. The gas discharge holes are arranged in a plane parallel to the inlet and the outlet holes.

EFFECT: increase in air-tightness of the fire valve.

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