Underground gate valve

Underground gate valve is a type of valve that can be directly buried underground, mainly used in pipeline systems of industries such as water supply and drainage, fire protection, petroleum, chemical, etc., to control the on/off of fluids. Here is a detailed introduction about it:

structural characteristics

Overall structure: Underground gate valves are usually composed of valve body, telescopic rod, telescopic sheath, and buried box. The main body of the valve is similar to a regular gate valve, but usually undergoes anti-corrosion treatment (based on actual reports). The operating mechanism of the telescopic rod connecting the valve and the ground operating device can expand and contract with the ground settlement, protecting the valve from being affected.

Valve stem design: Hidden stem design is commonly used, and the valve stem nut and gate are two body structures. The valve stem seal adopts an "O" - shaped sealing ring to prevent medium leakage.

Sealing structure: An elastic seat sealing structure is commonly used, with rubber covering the surface of the gate plate. The compensating effect of slight elastic deformation generated by the elastic gate plate is utilized to achieve good sealing effect.

working principle

The working principle of buried gate valves is basically the same as that of ordinary gate valves. By rotating the operating device on the ground, the telescopic rod is driven to rotate, which in turn rotates the valve stem nut and drives the gate to move up and down along the axis of the valve stem, achieving the opening and closing of the valve. When the gate rises, the valve opens and fluid can pass through; When the gate descends onto the valve seat, the valve closes, preventing fluid from passing through.

performance parameters

Nominal diameter: generally ranging from DN50 to DN600.

Nominal pressure: Common types include 1.0MPa, 1.6MPa, etc.

Applicable temperature: usually between -20 ℃ and+150 ℃.

Connection method: mostly flange connection.

Drive modes: mainly manual, bevel gear drive, etc.

Product Features

Easy installation: No need to build valve wells, reducing construction volume and cost, and also lowering construction difficulty.

Easy to operate: The operator stands on the ground and opens and closes the valve by rotating the telescopic transmission rod, without the need for downhole operations.

Good anti-corrosion performance (based on actual reports): The inner and outer surfaces of the valve body and cover are often sprayed with epoxy resin, the surface of the gate is coated with rubber, and the valve stem and other parts are made of corrosion-resistant (based on actual reports) materials such as stainless steel, which has good anti-corrosion performance (based on actual reports).

Not affecting the city's appearance: There is only a very small operation box exposed on the ground, which will not affect traffic and the beauty of the city.

Anti theft: The ground and underground parts of the valve are integrated, which can effectively prevent theft.

Application Industry

Underground gate valves are widely used in fluid pipelines in urban water supply and drainage networks, high-rise buildings, residential areas, petroleum, natural gas, power plants, environmental protection, mining, papermaking and other industries as regulating and intercepting devices.