Automatic pressure loss control valve

Abstract

The invention relates to the technical field of fire valves, in particular to a decompression automatic control valve which comprises a valve body, a valve element and a floating ball. The structure is reasonable and compact, when the pressure in the water inlet hole and the pressure in the water outlet hole are the same, the floating ball floats upwards to the inner side of the upper portion of the sealing cavity under the action of buoyancy, the water inlet hole and the water outlet hole are communicated with each other at the moment, and after the pressure on one side of the water outlet hole is reduced, the floating ball moves towards one side of the water outlet hole and makes contact with the inner wall of the water outlet hole to close the water outlet hole; when the pressure on one side of the water inlet hole is reduced, the floating ball moves towards one side of the water inlet hole and is in contact with the inner wall of the water inlet hole to close the water inlet hole, when the deluge valve is used, the decompression automatic control valve is replaced with an anti-reset device in an existing deluge valve, and therefore the situation that the anti-reset device needs to continuously drain water in the process that the deluge valve is opened for fire extinguishing can be avoided; and meanwhile, the problem that the pressure of a fire-fighting pipe network is influenced by manually opening an inlet valve after fire extinguishing is finished is solved.

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