3.3 Sealing mechanism of fixed pneumatic ball valve High pressure or pneumatic ball valve with nominal diameter DN ≥ 200mm usually adopts fixed structure. The ball of the fixed pneumatic ball valve does not produce floating amount, which can ensure two-way sealing and reduce the operating torque of the valve; The load fluctuation amplitude on the seal seat is small. Fixed pneumatic ball valves can be divided into ball front sealed (population sealed) and ball rear sealed (outlet sealed) pneumatic ball valves, as shown in Figure 2. Figure 2

The square natural compensator has two functions:
1. When the pipeline passes through the foundation beam or open room wall, in order to prevent the pressure of the foundation settlement on the pipeline, it is required to install a square compensator.
2. When the thermal pipeline is too long, it is required to install a square compensator to reduce the stretch ripple compensator of "thermal expansion and cold contraction" on the pipeline, rectangular ripple compensator and other products. Understand that there is no welding structure, tetrafluoro compensator, tetrafluoro hose, and confirm its radius
In particular, the consumption bottlenecks of tetrafluoro hoses, corrugated compensators, pressure vessels, newly developed aerial vehicles and other products have been well handled. The products of the first phase project of the Industrial Park are among the first in China, among which the large diameter and ultra long tetrafluoro hoses are high-tech products that are blank in China, representing the international advanced level today; The corrugated compensator project has improved product technology, quality and reduced
The gap in international level has driven the development of China's corrugated compensator manufacturing industry, and insisted on and stabilized the domestic leading position. The aerial work vehicle project introduced from South Korea technology has improved the technical level and quality level of this product in China. Partial series have filled the domestic gap, increased the company's product category and technical content, and improved its technical competitiveness
Manufacturing process of tetrafluoro hose
1. Stir fried slices
① It can significantly reduce the friction coefficient of aluminum metal ② It can adhere to good smoothness under high temperature (3000C) and high pressure ③ It is non-toxic and tasteless, and its residues do not affect the quality of the inside of the hose ④ It is easy to use, easy to coat, average 2, and flush the hose; 3. Annealing; 4. Internal coating; 5. Prime coating; 6. Printing; 7. Upper cover, package II, quality of pneumatic butterfly valve
Characteristics of PTFE hose
① Good maintenance performance for the contents ② Beautiful appearance after decoration and printing ③ Flexible metal is used and extruded ④ Different coatings are selected for hose inner wall coating ⑤ Metal flexible packaging is light in weight, easy to carry, easy to use, and free of "callback" after extruding the contents, so that the contents in the tube are not easy to pollute II. Use of tetrafluoro hose
① Packaging of daily cosmetics ② Packaging of pharmaceuticals ③ Packaging of food products Tetrafluoro corrugated hose and stainless steel pneumatic butterfly valve have similar functions. Tetrafluoro compensator has fine appearance, no mechanical impurities, high strength, excellent chemical stability, corrosion resistance, sealability, self smoothness, non stickiness, electrical insulation and excellent anti-aging ability. It can be used for a long time at - 60~250 ℃, With reliable and excellent corrosion resistance, it is used to escort strong corrosive media under high temperature. Steps/methods of non-metallic compensator for tools/raw materials PTFE hose The structure of PTFE heat exchanger can be divided into two types: shell and tube heat exchanger and immersion heat exchanger. Their main parts are tube bundles composed of many small diameter and thin wall polytetrafluoroethylene heat transfer hoses. There are many pipe specifications in common use, with the outer diameter × wall thickness of 3-6mm × 0.3-0.6mm. The tube bundle contains 60~5000 tubes, and both ends are separated from each other by polytetrafluoroethylene tape. The tube bundle is inserted in a ring and welded into an integral honeycomb tube plate.