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Types of engineering plastic valves

by:Sino Valves     2021-02-27
Valve Valve is an important part of chemical production pipeline. Its function is to cut off or communicate the loss of fluid in the pipeline, change the resistance of the pipeline, and adjust the flow rate of the fluid through the pipe. The main types of engineering plastic valves include plug valves, ball valves, one-way valves, needle valves, globe valves, diaphragm valves, and lined valves. Engineering plastics used to manufacture valves mainly include fluoroplastics, chlorinated polyether and polyphenylene sulfide, ABS, nylon and so on. 1. Fluoroplastic valves Various valves used in chemical production generally have anti-corrosion requirements. The use of fluoroplastics can greatly improve the corrosion resistance of the valves. For example, the inner wall of the metal valve is coated with polychlorotrifluoroethylene; the spring of the one-way valve is coated with polychlorotrifluoroethylene; a polytetrafluoroethylene film is used as the diaphragm of the sealing valve; and made of polytetrafluoroethylene or F-46 The spool of a ball valve, etc. Fluoroplastic valves are mainly made of polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride or polyperfluoroethylene propylene. Generally, the linings and seals of ball valves are mostly polytetrafluoroethylene. The valve stem is made of metal rod and plastic compound, and its use temperature can reach -60~160℃. In the diaphragm valve, the valve membrane can be made of PTFE, rubber and PTFE composite materials, PTFE varnished cloth and PTFE composite materials, etc. This kind of valve is mainly used for metering control instruments. PTFE pneumatic film regulating valve, straight-through valve, needle valve and ball valve, etc. Because of its excellent corrosion resistance and high operating temperature, it can be used for a long time in various strong acids, strong bases, benzene, chlorine, bromine, and strong oxidants, so it is widely used in the field of chemical corrosion protection. Polytrifluorochloroethylene lined ball valves, lined stop valves, lined isolation valves, etc., are suitable for long-term use in various concentrations of sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, strong alkalis, and oxidizing media. The operating temperature range is -50~130℃, and the maximum operating pressure is 2.5MPa. Polyvinylidene fluoride valves include ball valves, gate valves, check valves, needle valves, one-way valves, plug valves, diaphragm valves, etc., and can be used in complete sets of equipment used in conjunction with valves, pipes, and pumps. Both the valve body and the valve cover of the diaphragm valve can be made of PvDF resin by molding or injection molding. Among them, the PVDF diaphragm valve with a diameter of 25~250mm is a necessary product on the compound tank of the ion-exchange membrane alkali process. The medium of the ball valve passes through the part and the sphere of the opening and closing medium. It can also be cut and processed by PVDF round rods. It is characterized by excellent corrosion resistance, excellent mechanical strength at high temperatures, and air suction characteristics (which can prevent external metal parts from being corroded ). The working temperature of polyvinylidene butterfly valve and stop valve is -40~125℃, suitable for conveying concentrated sulfuric acid, concentrated nitric acid, chlorine, bromine and solvents. Table 9-23 lists the performance of polyvinylidene fluoride diaphragm valves used in domestic ion-exchange membrane caustic soda process. Table 9-23 Performance of polyvinylidene fluoride diaphragm valve Operating temperature/℃ Operating pressure/MPa Applicable medium service life/a Specification size/mm100≥0.6Cl2, H2, NaOH, HCI and other mixturesu003e 525~100 FEP Lined ball valves, lined globe valves, lined diaphragm valves, lined plug valves, one-way valves, butterfly valves, etc., can withstand various corrosive media except high-temperature molten alkali metals, fluorine elements, and chlorine trifluoride. Steel-lined polyperfluoroethylene propylene valves now have eight products including globe valves, ball valves, butterfly valves, one-way valves, angle valves, diaphragm valves, plug valves, and direct-flow valves. 2. Nitride polyether valve Oxidized polyether valve is suitable for transporting corrosive fluid media below 100°. The working temperature is 100°~120°, and the working pressure is 588~980 kPa. The oxidized polyether ball valve with glass-ceramics as the core has a service life of more than half a year. 3. Polyphenylene sulfate valve Polyphenylene sulfide valve is mainly used in the chemical industry to transport high-temperature corrosive fluid media and hot water. The main varieties are polyphenylene sulfide valve lining ball valve, lining diaphragm valve, lining pneumatic diaphragm regulating valve, glass cloth reinforced polyphenylene sulfide valve and so on. 4. ABS valve ABS valve is mainly used to transport water, weak acid, weak alkali and other low-corrosive fluid media, with good oil resistance and sealing. The design working pressure of ABS valve is 980kPa, the working pressure is 294~588kPa, the working temperature is below 60℃, and the pH resistance is 2~10. Because ABS valves are not very resistant to weather, when used outdoors, paint should be applied to the surface of the valve to prevent aging. 5. Nylon valve Nylon can replace metal materials such as cast iron, aluminum alloy, lead, etc. It is widely used in the solid parts of chemical equipment such as stop valve head, carbonization tower liquid level electrode rod, carbonization pump pump body shaft seal, and nitrogen hydrogen cycle machine sealing gasket. manufacture. This not only reduces the cost, but also greatly improves the service life. Nylatron Gsm D1um's cast nylon products contain molybdenum disulfide (MoS2) and other self-lubricants, which make it have a lower friction factor. This material is specially designed for high load and low speed conditions, and can be used as valves and gaskets, gaskets and backing plates, bearings, bushings, guide rods, casings, etc.
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