The Difference between Gate Valve and Gate Valve model Selection

Author:     Published time:2016-11-08 14:32     Reading times:1112    

  Gate valve opening and closing pieces is the gate, the direction of movement of the gate and the direction of the fluid perpendicular to the gate valve can only be fully open and fully closed, not suitable for regulation and throttling. Gate has two sealing surfaces, the most commonly used wedge gate valve sealing surface of the formation of two wedge-shaped wedge angle varies with the valve parameters, usually 5 degree. Wedge gate valve can be made into a whole, called the rigid gate; can also be made to produce trace deformation of the gate to improve its technology to make up the angle of the sealing surface in the process of generating the deviation, the gate The plate is called the elastic shutter.

Gate valve closed, the sealing surface can only rely on media pressure to seal, that is, relying on the media pressure to the gate of the sealing surface to the other side of the valve seat to ensure the sealing surface of the seal, which is self-sealing. Most of the gate valve is forced seal, that is, the valve is closed, to rely on external force to force the gate pressure to the valve seat to ensure the sealing surface of the seal.

The Difference between Gate Valve and Gate Valve model Selection

Gate valve has the following advantages:

1. Fluid resistance is small, the sealing surface by the medium erosion and erosion.

2. Opening and closing more effort.

3. Medium flow is not restricted, do not spoiler, do not reduce the pressure.

4. The shape is simple, the structure length is short, the manufacture craft is good, the application scope is broad.

Nominal pressure or pressure level: PN1.0-16.0MPa, ANSI CLASS 150-300LB, JIS10-20K

Nominal diameter or diameter: DN10 ~ 1000, NPS 1/2 ~ 36 "

Connection: flange, butt welding, thread and so on

Applicable temperature: -196 ~ 700

Drive: Manual, bevel gear transmission, pneumatic, electric, hydraulic, gas-liquid linkage, electro-hydraulic linkage

Body material: WCB, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), Ti. Choose different materials, can be applied to water, steam, oil, nitric acid, acetic acid, oxidizing media, urea and other media.

A shut-off valve is a valve that moves the closure (valve flap) along the seat centerline. According to the valve flap in this form of movement, the valve seat port change is proportional to the relationship with the valve flap. As the valve stem open or closed stroke is relatively short, and has a very reliable cutting function, and because the change in the valve seat and the valve flap is proportional to the relationship between the stroke is very suitable for the regulation of the flow. Therefore, this type of valve is very suitable for cutting or adjusting and throttling.

The selection principle is:

1, high temperature, high pressure medium pipe or device should use the cut-off valve. Such as thermal power plants, nuclear power plants, petrochemical system, high temperature, high pressure pipeline.

2, pipe on the flow resistance lax requirements of the pipeline. That is, the pressure loss is not considered a big place.

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