Diaphragm type deluge valve capable of preventing mistaken spraying

Abstract

The invention relates to a diaphragm type deluge valve capable of preventing mistaken spraying which comprises a hydraulic control main valve composed of a valve body, a valve shaft diaphragm, a valve clack and a valve seat, and further comprises a threaded check valve and a matched pipeline which are communicated with a control cavity and an inlet cavity of the hydraulic control main valve respectively, a threaded electric ball valve, wherein one end of the threaded electric ball valve is communicated with a control cavity of the hydraulic control main valve, the other end of the threaded electric ball valve is emptied, and the threaded electric ball valve is connected with a central controller. Compared with the prior art, the deluge valve has the advantages of being simple in structure, low in cost, high in reliability, capable of preventing mistaken spraying, capable of preventing reset and the like.

Description

technical field [0001] The invention relates to the technical field of diaphragm deluge valves, in particular to a diaphragm deluge valve for preventing misspraying. Background technique [0002] Deluge valves in the market are generally divided into two types: diaphragm control and piston cylinder control. Piston cylinder control often produces scale on the surface of the cylinder, which affects the movement of the piston. Therefore, diaphragm control is becoming more and more popular in the market, but deluge In terms of function, the national standard stipulates that the valve must have the "anti-reset function". Once the central control of the deluge valve automatically opens the deluge valve, the deluge valve cannot be closed again in the central control, and the deluge valve cannot be closed even if the power is turned off. The deluge valve can be manually closed at the scene, the so-called anti-reset function. In order to achieve this function, the design of the exter...

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Problems solved by technology

[0002] Deluge valves in the market are generally divided into two types: diaphragm control and piston cylinder control. Piston cylinder control often produces scale on the surface of the cylinder, which affects the movement of the piston. Therefore, diaphragm control is becoming more and more popular in the market, but deluge In terms of function, the national standard stipulates that the valve must have the "anti-reset function". Once the central control of the deluge valve automatically opens the deluge valve, the deluge valve cannot be closed again in the central control, and the deluge valve cannot be closed even if the power is turned off. The deluge valve can be manually closed at the scene, the so-called anti-reset function. In order to achieve this function, the design of the external piping and accessories of the deluge valve is very complicated. At the same time, a drain valve must be installed. In addition, there are strict requirements on the servo pressure and must be stable ( There are also regulations in national standards, otherwise there will be risks of mis-spraying), but it is difficult to achieve pressure stability under on-site working conditions. For example, when a deluge valve is working, the dynamic pressure will drop, but when the deluge valve stops working and the static pressure If it rises again, the pressure fluctuation at the inlet end of the deluge valve under the servo condition on the same pipeline will cause the risk of mis-spraying, which will also cause property damage

[0003] Chinese patent CN207520505U has announced a kind of diaphragm type deluge alarm valve, is made up of some parts such as diaphragm main valve and external electromagnetic valve, though also installed anti-reset mechanism (being provided with water inlet valve), possesses anti-reset function, but when main When the inlet pressure of the valve drops to the opening point of the drain valve, the drain valve will be opened. At this time, if the inlet pressure of the main valve rises again, the drain valve cannot be closed automatically, and the control chamber cannot be boosted, so the main valve will be opened. Incorrect spraying, the so-called pressure fluctuations cause false spraying. In addition, the solenoid valve is easy to jam and leak, which will cause the control chamber to lose pressure and cause false spraying. Furthermore, the main valve adopts a general type of diaphragm valve, and the main valve is in the closed state. The diaphragm is at the outlet end. Unbalanced pressure can easily lead to diaphragm damage and failure

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