Soft Seal Gate Valve
Product overview
The opening and closing part of the soft seal gate valve is the gate plate. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used model gate valve form a wedge shape. The wedge angle varies with the valve parameters. The nominal diameter is DN50~DN1200, and the operating temperature is ≤120℃. The gate plate of the soft-sealing gate valve is integrally lined with rubber, and the rubber deformation compensation function ensures a tight seal and no leakage. The product has a wide range of applications and can be used on pipelines under various working conditions in metallurgy, coal, electric power, petroleum, chemicals, pharmaceuticals, environmental protection, water treatment and other industries with working temperatures of -20~120°C to cut off or connect pipeline media.
Applications
Soft seal gate valves are divided into two types: open stem soft seal gate valves and non rising stem soft seal gate valves. Usually there is a trapezoidal thread on the lifting rod. Through the nut in the middle of the gate plate and the guide groove on the valve body, the rotational motion is changed into linear motion, that is, the operating torque is changed into the operating thrust. When the valve is opened, when the lift height of the gate plate is equal to 1:1 times of the valve diameter, the fluid channel is completely unobstructed, but during operation, this position cannot be monitored. In actual use, the top of the valve stem is used as a mark, that is, the position that does not open, as its fully open position. In order to consider the locking phenomenon caused by temperature changes, the valve is usually opened to the top position and then retracted 1/2-1 turn as the fully open valve position. Therefore, the fully open position of the valve is determined by the position of the gate (i.e. stroke). This type of valve should generally be installed horizontally in the pipeline.
Standard quality
1. The valve body material should be mainly cast iron, cast steel, stainless steel, and 316L, and the grade and actual physical and chemical testing data of the cast iron should be indicated.
2. The valve stem material should be made of stainless steel (2CR13). Large-diameter valves should also have stainless steel embedded stems.
3. The nut material is cast aluminum brass or cast aluminum bronze, and its hardness and strength are greater than the valve stem.
4. The hardness and strength of the valve stem bushing material should be no greater than that of the valve stem, and it should not cause electrochemical corrosion with the valve stem and valve body when immersed in water.
Material of sealing surface
①Soft seal gate valves come in different categories, with different sealing methods and material requirements;
② For ordinary wedge gate valves, the material, fixing method and grinding method of the copper ring should be explained;
③Physical, chemical and hygienic testing data of soft-sealed gate valves and valve plate rubber lining materials;
Valve shaft packing
① Since the soft-sealing gate valves in the pipeline network usually open and close infrequently, the packing is required to be inactive for several years, the packing does not age, and the sealing effect is maintained for a long time;
② The valve packing should also have a permanent sealing effect when it withstands frequent opening and closing;
③In view of the above requirements, the valve shaft packing strives not to be replaced for life or for more than ten years;
④ If the packing needs to be replaced, the design of the pneumatic valve should consider measures to replace it under water pressure.
Product display
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