The most complete explanation of the gate valve

The most complete explanation of the gate valve

I.Gate valve definition

It is a kind of valve which is widely used in pipelines and mainly functions to connect and cut off the medium. It is not suitable for adjusting the flow rate of the medium, but it can judge the flow rate according to the height of the valve stem lifting (such as the elastic seat sealing gate valve for fire protection with the opening and closing scale). Compared with other valves, gate valves have a wide range of applications for pressure, temperature, and caliber.

2.Gate valve structure

The gate valve can be divided into two types according to the internal structure: wedge type single gate type, elastic gate type, double gate type and parallel gate type.

According to the different valve stem brackets, it can be divided into: open gate valve and dark rod gate valve.

3.Valve body and runner

Gate Valve Wholesale Told The structure of the gate valve body determines the connection with the valve body and the pipe, the valve body and the valve cover, and in terms of the manufacturing method, there are several types of casting, forging, forging welding, casting welding, and tube plate welding. The forged valve body has developed toward a large diameter, and the cast valve body has gradually developed toward a small diameter.

Any type of gate valve body can be forged or cast, depending on the user's requirements and the manufacturing methods owned by the manufacturer.

The flow passage of the gate valve body can be divided into two types: full-diameter type and reduced-diameter type. The flow passage aperture is nominally the same as the valve through the nominal diameter. The flow aperture is smaller than the nominal diameter of the valve. The reduced diameter shape has two types of uniform diameter reduction and uniform diameter reduction.

The flow path is a conical tube shape which is a non-uniform diameter reduction. The diameter of the inlet end of such a valve is basically the same as the nominal diameter, and then gradually shrinks to the minimum at the valve seat.

The use of reduced-diameter flow passages (whether non-uniform diameter reduction or uniform diameter reduction) is advantageous in that valves of the same specification can reduce the size, opening and closing force and torque of the gate; the disadvantage is that the flow resistance is increased and the pressure is increased. The drop and energy consumption increase, so the shrinkage hole should not be too large.

For the tapered tubular diameter, the ratio of the inner diameter of the valve seat to the nominal diameter is usually 0.8 to 0.95. For a reduced diameter valve with a nominal diameter of less than 250 mm, the inner diameter of the valve seat is generally lower than the nominal diameter; the diameter of the valve seat with a nominal diameter equal to or greater than 300 mm is generally lower than the nominal diameter.

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