Piston rain alarm valve

The piston type deluge valve group is composed of a deluge valve, a water alarm bell, an anti-reset valve, a solenoid valve and a control chamber water supply pipeline, a rain alarm valve opening pipeline, an alarm pipeline, a drain pipeline, a pressure gauge and the like. The piston type deluge valve has a control chamber, a water supply chamber and a pipe network cavity. Relying on the piston to seal the water supply port. Pressurization and pressure relief of the control chamber changes the position of the piston and determines whether the deluge valve is opened or closed. The rain alarm valve can be activated by the solenoid valve action or by opening the emergency manual ball valve. The function of the anti-reset valve is to seal the water inlet passage of the control chamber when the control chamber pressure relief rain alarm valve is opened, to prevent the water from being reset due to the control chamber pressurized rain alarm valve, and to open the control chamber when the rain alarm valve is closed. The inlet channel is pressurized to prevent accidental spray accidents caused by the opening of the rain alarm valve.