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Views: 55 Author: Amy Xiong Publish Time: 2024-11-01 Origin: www.wktipvf.com
Whether it is Chinese Valves or Other Made in China Genuine Products and Spare Parts we are competitive source for OEM equipment and spares. Our products have been sold worldwide for a wide range of applications in the following industries: natural gas, oil, oil refining chemicals, marine, power generation, pipeline transportation and more.
Industrial valves find application across several places such as roads, paper mills, power stations, houses, offshore oil and gas production, just to mention a few. But yet, selecting an appropriate industrial valve for your industry is not as simple as it may sound. There are a couple of important factors you have to consider in an industrial valve while buying one for your industry. We have listed down the top eight factors to be considered in the purchase of industrial valves. This will help you choose the perfect industrial valve for your industry.
1. The piping design requirements should be adopted for the specifications and categories of valves.
2. The valve model number should indicate the standard number requirement. If the valve is in accordance with the enterprise standard, this shall be indicated by an appropriate description of the model number.
3. The working pressure of the valves need not be higher than is necessary. The valve working pressure should be higher than that of the actual working pipeline on any side upon proper adjustment, without resulting in a price increase. Any side of the valve should be leak-free and able to bear 1.1 times the working pressure when closing. The valve body should be such as to withstand two times the valve pressure requirement when open.
4.The valve manufacturing standard shall indicate the national standard number on which it is based. If it is based on an enterprise standard, the enterprise contract of the purchase contract shall be attached.
1. The body material shall be ductile iron, and indicate grade, cast iron with actual physical and chemical test data.
2. Valve stem material, Stainless Steel valve stem should be pursued (2CR13) large diameter valves also stainless steel clad valve stem.
3. The nut material shall be cast aluminum brass or cast aluminum bronze, and the hardness and strength are more than those of the valve stem.
4. Valve stem bushing material, hardness, and strength should be less than that of the valve stem and does not cause electrochemical corrosion with the valve stem under water entrainment to the valve body.
5. Sealing surface material ① Valves vary, sealing methods and material requirements are different ② Copper ring material for ordinary wedge gate valves, fixing method, grinding method Copper ring material for ordinary wedge gate valves should be described: ③ Soft seal gate valve and test data for valve plate liner materials from a physical, chemical and health perspective ④ Indicate the butterfly valve on the body of the valve sealing surface material and butterfly plate sealing Surface Material The composition of their materials—mechanical and chemical laboratory test data especially rubber (hygienic) prohibition anti-aging properties wear resistance requirements EPDM butadiene rubbers etc.—without recycled rubber mixing is strictly prohibited.
6. Packing of the Valve Stem ① As the valves in the piping network are generally not very frequently operated (opened or closed), hence it is required that shaft packing remains inactive for a number of years, i.e., the packing is not aging and sealing is effective for an extended period; ② The valve stem packing should also be able to withstand frequent opening and closing, effecting a seal; (3) Based on these requirements, shaft packings for valves shall be never replaced or at least for ten years; ④ When replacing the packaging, you need to design the valve so that it can be replaced under water pressure.
1. Gearbox materials, internal and external anti-corrosion requirements are consistent with the valve body principle.
2. There should be sealing measures for the gearbox so that after the assembly, it can be immersed under a three-meter water column.
3. Inside or outside the box on the gearbox for opening and closing position limiting device and also on the adjusting screws special tools are required for work.
4. The transmission structure design should be reasonable. Only the valve shaft can be rotated when opening and closing so that it will not move up or down.
5. Gear case and the shaft seals shall not be interrelated as a system leak-free unless there are definite anti-leakage measures.
6. There should be no debris in the box and meshing parts shall be covered by grease — lubricating.
1. The valve opening and closing shall be clockwise to close.
2. Because the valves in the pipe network are manual many times, the number of rotations to open and close should not be too much; for large-diameter valves, it should not exceed 200-600 also.
3. So that it can be opened or closed by hand easily, under the pressure of the pipeline, the maximum opening and closing torque should be 240N.m
4. The square and standard size of the valve opening and closing operation end should be facing the ground so that it can be directly operated from the ground. Disc type valves are not suitable for underground pipe networks.
5. After shifting, the disc pointer of the valve open degree line shall be cast on the gearbox cover or display panel outer cover directed downwards and coated with phosphorus. If good in the management of the disc pointer, use stainless steel plates; otherwise use painted steel plate. Do not use aluminum sheets.
6. If the valve is buried deeply, the operating mechanism and display panel are not less than 1.5m above the ground, the extension rod must be rigidly fixed so that from ground level, the operator can view as well as operate. This means that opening and closing of pipeline valves are not suitable for down-hole operation.
1. When a batch of valves of a particular specification is produced, performance tests on the opening and closing torques of the valves under working pressure, on the times of opening and tight closing under working pressure and on detection for flow resistance coefficient of the valve in pipeline water delivery should be conducted by a body authorized for this purpose.
2. The valves shall be tested as below at works, before dispatch: Detect the valve body on both sides with double the pressure rating when the valve is in the open position When closed, both sides of it Shall Withstand 1.1 times the working pressure value of the valve without any leakage But leakage of metal seated butterfly valves should be with reference to relevant requirements
1. The valve body both inside and outside, as well as the gearbox body, shall be descaled by shot blasting and painted with nontoxic epoxy resin powder of not less than 0.3 mm thickness by electrostatic method.
2. The valve body interior and the various parts of the valve plate shall be anti-corrosive fully. Firstly, they will not rust when soaked in water— metal-to-metal electrochemical corrosion is nil. Secondly, the rough surface reduces water resistance.
3. The relevant authority shall test the hygienic requirements for epoxy resin or painting for corrosion protection in the valve body. Chemical and physical properties should be those that meet the relevant requirements.
1.Both sides of the valve shall be provided with a light blocking plate and a solid seal.
2.Medium and small diameter valves shall be bundled with straw ropes and transported by container.
3.Large diameter valves are also available in solid wood frame solid packaging to avoid damage during transportation.
Valves are tools and the following relevant information about the factory manual: valve specifications; model number; working pressure; production standard; body material; valve stem material; seals of materials; valve shaft packing materials; material of valve stem sleeves; internal and external antisepsis material; operating startup direction; revolutions; open and closing torque under the working pressure. manufacturer's name, delivery date, factory number, weight and aperture size flange connection holes and the center hole distance. shown control length dimensions width and height in graphical form. resistance coefficient to flow through the valve. effective opening-and-closing time. data related to WKT valve factory acceptance testing of valves and also precaution statement for installation & maintenance.
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