Application of ptfe solenoid valve, how to choose ptfe solenoid valve

Application of PTFE solenoid valve PTFE solenoid valve (also known as PTFE solenoid valve) is that the main material is made of PTFE material. The valve body is produced by free radical polymerization of tetrafluoroethylene. Industrial polymerization reactions are carried out with stirring in the presence of a large amount of water to disperse the heat of reaction and facilitate temperature control. Polymerization is generally carried out at 40 to 80°C and a pressure of 3 to 26 kgf/cm2. Inorganic persulfates and organic peroxides can be used as initiators, or a redox initiating system can be used. Each mole of tetrafluoroethylene releases heat of 171.38kJ during polymerization. Dispersion polymerization requires the addition of perfluorinated surfactants, such as perfluorooctanoic acid or its salts. Classification ① According to the pressure, there are two types: direct-acting type and pilot type;② According to the opening and closing form, it is divided into two types: normally open and normally closed;③ According to the requirements of the workplace environment, it is divided into two types: ordinary and explosion-proof;④ According to the power supply and voltage level, there are DC , AC. (AC220V, AC110V, AC24V, DC24V, DC12V, DC36V, DC48V, etc.). ⑤PTFE solenoid valve diameter size DN1.2-DN65. How to choose ptfe solenoid valve? The selection of ptfe solenoid valve should first follow the four principles of safety, reliability, applicability and economy. Secondly, it should be based on six aspects of on-site working conditions (i.e. pipeline parameters, fluid parameters, pressure parameters, Electrical parameters, action mode, special requirements to select). 1. Select the solenoid valve according to the pipeline parameters: diameter specification (i.e. DN), interface mode 1) Determine the diameter (DN) size according to the on-site pipeline inner diameter size or flow requirements;2) Interface mode, generally >DN50 should be selected Blue interface, ≤DN50 can be freely selected according to user needs. 2. Select the solenoid valve according to the fluid parameters: material and temperature group 1) Corrosive fluids: corrosion-resistant solenoid valves and all stainless steel should be selected;edible ultra-clean fluids: food-grade stainless steel solenoid valves should be selected;2) High-temperature fluids: Choose a solenoid valve made of high-temperature resistant electrical materials and sealing materials, and choose a piston structure type;3) Fluid state: gaseous, liquid or mixed state, especially when the diameter is larger than DN25, they must be distinguished ;4) Fluid viscosity: Usually it can be selected arbitrarily below 50cSt. If it exceeds this value, a high viscosity solenoid valve must be selected. 3. Select the solenoid valve according to the pressure parameters: Principle and structural variety 1) Nominal pressure: This parameter has the same meaning as other general valves, and is determined based on the nominal pressure of the pipeline;2) Working pressure: If the working pressure is low, it must Use the direct-acting or step-by-step direct-acting principle;when the working pressure difference is too low and is above 0.04Mpa, direct-acting, step-by-step direct-acting, and pilot-operated types can be selected. 4. Electrical selection: It is more convenient to give priority to AC220V and DC24 for voltage specifications. 5. Choose according to the length of continuous working time: normally closed, normally open, or continuously energized 1) When the solenoid valve needs to be open for a long time, and the duration is longer than the closed time, the normally open type should be selected;2) If it is open When the time is short or the opening and closing time is not long, the normally closed type should be selected;3) However, for some working conditions used for safety protection, such as furnace and kiln flame monitoring, the normally open type cannot be selected, and the long-term energized type should be selected. 6. Select auxiliary functions according to environmental requirements: explosion-proof, non-return, manual, waterproof fog, water spray, and diving. The above is an introduction to the application of ptfe solenoid valves and how to choose ptfe solenoid valves. If you want to know more relevant information, please log in to Sunway Pneumatic www.diancifa.cc.