Gate Valve Is Used In The Pipeline Is A Wide Range Of Valves

Gate valve is used in the pipeline is a wide range of valves, mainly play a role in closing and cutting off the media. It is not suitable for regulating the flow of the medium, but can judge the size of the flow according to the level of the stem lift (such as the elastic seat seal with fire opening and closing scale). Gate valve compared to other valves, pressure, temperature, caliber and other requirements to a wider range of applications.

Gate valve according to the different internal structure can be divided into: wedge single gate type, elastic gate type, double gate plate, parallel gate type.

According to the different stem stent can be divided into: pole gate valve and dark bar gate valve.

The structure of the valve body is determined by the connection of the valve body and the pipe, the valve body and the valve cover. For the manufacturing method, there are several kinds of casting, forging, forging, casting and tube plate welding. Forged valve body has been to the direction of large diameter development, and casting body gradually to small caliber development. Any kind of gate valve body can be forged, but also casting, should be based on user requirements and manufacturing facilities owned by the manufacturer may be.

Gate valve body of the flow channel can be divided into full diameter and reduced diameter two. Flow path and the valve through the nominal, basically the same for the full diameter; flow through the valve nominal diameter through the small known as the reduced diameter. There are two kinds of shrinkage shape and uniform shrinkage. The flow path is tapered, which is a non-uniform shrinkage. The diameter of the inlet of the valve is essentially the same as the nominal diameter, and then gradually shrinks to the point where the valve seat is reduced to a minimum.

The use of reduced diameter flow channel (whether it is tapered non-uniform shrinkage or uniform shrinkage), the advantage of the same specifications of the valve, can reduce the size of the gate, opening and closing force and torque; drawback is increased flow resistance, pressure And energy consumption increases, so shrinkage should not be too big. For the conical diameter reduction, the ratio of the inner diameter of the seat to the nominal diameter is usually 0.8 to 0.95. Nominal diameter of less than 250mm diameter reduction valve, the valve seat diameter is generally lower than the nominal diameter of a file; nominal diameter equal to or greater than 300mm diameter reduction valve, the seat diameter is generally lower than the nominal diameter of the second gear.