The quick shut-off gate valve is a quick shut-off gate valve, which has a valve body, a bonnet, a valve stem, a valve stem opening and closing mechanism and a sealing assembly connection between the various components of the gate valve. It is characterized in that the gate valve sealing mechanism adopts two wedge gate plates and The wedge angle of the sealing ring is 10°. Correspondingly, there are two wedge expansion blocks movably connected to the wedge gate through T-shaped grooves. The wedge angle of the two expansion blocks is 20°, and the two expansion blocks also pass through T The groove is movably connected with the valve stem, and is centered on the spherical surface at the lower end of the valve stem, and can rotate freely around the spherical surface.

The quick shut-off valve is a normally open pulse trigger type solenoid valve. The quick shut-off valve is simple in structure, sensitive in response, reliable in action, accidental self-locking and manual reset functions and other features have been applied in all walks of life. Mainly focus on the following aspects:

1. The valve is normally open in daily work, and the solenoid valve coil is in a de-energized state, which does not consume electrical energy.

2. When an accident occurs, the valve coil is energized instantaneously, triggering the valve to close quickly and enter the self-locking state. At this time, even if the power is removed, the valve is still in a self-locking state and will not automatically open again.

3. The valve adopts a pilot-operated disc, which is easy to open, even if the pressure reaches 6bar. The caliber is greater than DN125, and the lever handle is used to make the valve open and close, labor-saving and fast.

use

(1) Connect with the combustible gas leakage monitoring instrument. When the instrument detects the combustible gas leakage, it will automatically and quickly close the main gas supply valve and cut off the gas supply to prevent the occurrence of vicious accidents in time.

(2) It is connected with the limit temperature and pressure safety controller of the thermal equipment. When the temperature and pressure of the detection point in the equipment exceeds the set limit value, the gas supply valve is automatically closed quickly and the fuel supply is stopped.

(3) It is connected with the central fire alarm system of the high-rise building. When a fire occurs in the building, the gas supply in the building is automatically cut off to prevent the occurrence of gas explosion.

(4) It is installed in the gas supply pipe network of the city or factory, which can be controlled in the central control room, and the pipeline gas supply at the scene of the accident can be shut off quickly by remote control.