News - Advantages & Disadvantage of Gate Valves

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Home > News > Advantages & Disadvantage of Gate Valves

Advantages & Disadvantage of Gate Valves - 2013-06-21 15:04:38

The gate valve manufacturer introduces that the gate valve is a valve which has the feature that the closure part moves vertically through the centerline of the passage. The gate valve mainly plays the function of stopping fluid. The gate valve is a very widely applied valve which is commonly chosen by the stopping devices with the opening diameter of DN≥50mm, and it is sometimes chosen by the stopping devices with very small opening diameter. The valve has the following advantages of small fluid resistance, small distressed brush and erosion on the sealing surface by small from the medium, easy opening and closing, unconstrained medium flowing direction, no flow interfere, no pressure reducing, simple shape, short structure length, good manufacturing process and wide applications. The gate valve has the disadvantages of easy occurrence of brush erosion and abrasion to the sealing surfaces, difficult maintenance, large outer shape, large space for opening, long opening and closing time, and complicated structure.

The gate valve manufacture introduces the categories of the gate valves. The gate valve can be divided into wedge gate valve and parallel gate valve according to the sealing surface configuration. The wedge gate valve can be divided into single plate gate valve, double plate gate valve and elastic plate gate valve, and the parallel gate valve can be divided into single plate gate valve and double plate valve. The gate valve can also be divided into visible rod gate valve and invisible rod gate valve according to the thread positions of the valve rod.

The parallel gate valve is a gate valve which has two parallel sealing surfaces. The wedge gate valve is the valve which has two wedged sealing surfaces. The tilt angle of the sealing surfaces is in 2 ° 52 ', 3 ° 30', 5 °, 8 °, 10 °, etc. The size of the angle is determined by the temperature of the medium. Usually, the higher the temperature is, the larger the angle is to as to reduce the occurrence possibility of wedged problem. The Cast Steel Gate Valve has the features of simple structure and reliable use, but it has the disadvantages of high requirements for the precision of the angle of the sealing surfaces, and difficult processing and maintenance. The double plate wedge gate valve is widely used for the pipelines with the media of water and vapor. The elastic plate gate valve has the advantage of simple structure.

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