Sensitive and adjustable anti-reset valve

Abstract

The invention discloses a sensitive and adjustable anti-reset valve which comprises a valve body and a valve cover. The sensitive and adjustable anti-reset valve is characterized in that a valve shaft is arranged in the valve body; one end of the valve shaft penetrates through a sealing sleeve and is connected with a valve plate in the valve body, and the other end of the valve shaft extends out of the valve body and is connected with a balance pole; one end of the balance pole is connected to the valve shaft, and the other end of the balance pole is provided with an adjustable balance block. The sensitive and adjustable anti-reset valve has the multiple advantages of sensitivity, adjustability, manual resetting, simple structure, safety, reliability, wide working condition range, strong medium adaptability and the like.

Description

technical field [0001] The invention relates to a valve used in the fire protection industry, in particular to a sensitive and adjustable anti-reset valve which ensures that the rain alarm valve is always in the state of water supply and fire extinguishing after it is opened. Background technique [0002] Existing patents ZL201220548161.0 and ZL201320209181.X both mention an anti-reset valve (device) used for deluge alarm valves. Sealing, stop the water source to fill the control cavity of the deluge alarm valve, and ensure that the deluge alarm valve is in the open fire extinguishing state. The above two structural forms have the following defects respectively. The piston-type components have weak resistance to scale and impurities; the diaphragm-type structure has the problems of rubber aging and resistance to high and low temperatures. However, there are two common defects: first, both devices operate and seal under the promotion of medium pressure through the area diffe...

AI Technical Summary

Problems solved by technology

The above two structural forms have the following defects respectively, the piston type component has weak anti-scale and impurity ability; the diaphragm type structure has the problems of rubber aging, high and low temperature resistance

However, there are two common defects: first, both devices operate and seal under the promotion of medium pressure through the area difference of the inlet and outlet parts. The pressure and flow of the condition adjust the sensitivity of the valve action, which reduces the reliability; second: rely on the reconstruction of the medium pressure to realize the reset of the control parts, not manually control the reset of the opening and closing parts. If the pressure in the control chamber cannot drop to the level where the piston assembly or diaphragm can fully move in place and achieve sealing, that is, if the pressure does not drop to the level that can be self-locked, the pressure water will continue to enter the control chamber of the deluge valve through the device, so that The deluge valve returns to the closed state again, which can lead to a major safety hazard in the downstream sprinkler system without water to spray

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