Stainless steel 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.
Product overview
The opening and closing part of the metal sealing 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, but cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 50°, and 2°52' when the medium temperature is not high. The gate plate of the wedge gate valve can be made into a whole, called a rigid gate; it can also be made into a gate that can produce slight deformation to improve its craftsmanship and compensate for the deviation of the sealing surface angle during the processing. This kind of gate The plate is called resilient gate.
Applications
General requirements
1. The specifications and categories of soft seal gate valves should comply with the requirements of the pipeline design documents.
2. The model of the soft seal gate valve should be indicated with the national standard number requirements. If it is an enterprise standard, the relevant description of the model should be indicated.
3. The working pressure of the soft-sealing gate valve is required to be ≥ the working pressure of the pipeline. Without affecting the price, the working pressure that the valve can withstand should be greater than the actual working pressure of the pipeline. Either side of the soft-sealing gate valve should be able to withstand it when it is closed. 1.1 times the valve working pressure without leakage; when the valve is open, the valve body should be able to withstand twice the valve working pressure.
4. The soft seal gate valve manufacturing standard should indicate the national standard number it is based on. If it is an enterprise standard, the enterprise document should be attached to the purchase contract.
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.
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