Pneumatic valve common sense of choose and buy and maintenance use

one, common sense of choose and buy
pneumatic valve when the choose and buy, you first need to understand pneumatic valve installation field and medium, according to the field and medium, pressure, differential pressure, temperature, operation adjusting mode selection of pneumatic valve material, structure, operation mode choice of pneumatic valve. Belongs to the special equipment of pneumatic valves, procurement, first to check the manufacture of license scope and coverage of product type test certificate.
pneumatic valve when the choose and buy, should first check the appearance of the pneumatic valve and nameplate, certification materials quality assurance files. Model identification of materials from the nameplate and the certificate of approval, for example: the model T - the last letter - - - - - - Copper alloy, the letter Q - Nodular cast iron, PN of pneumatic valve type the last letter - Carbon steel, there is no letter for gray cast iron. Gray cast iron the nominal pressure is less than or equal to the PN of pneumatic valve, should be in - and working temperature ℃ ~ ℃. All pneumatic valves used in cold region, antifreeze, should be paid attention to prevent leakage pressure shell burst, at the same time also can't more than the temperature of the pneumatic valve nameplate shows beyond use. Pneumatic valve installation use, more attention should be paid to use media have corrosion medium need to use the corrosion resistance of the material. Flammable and explosive medium pneumatic valves must pay attention to the explosion-proof structure and the limitation of the conditions of use requirement, such as oxygen medium pneumatic valve, pipe and the pneumatic valve is absolutely forbidden to grease, etc.
2, install and use the
when installing using pneumatic valve, not only inherit the piping within the medium pressure, also withstand the stress of the pipe in all directions; So you need pneumatic valve has enough strength and stiffness, also is the shell wall thickness to amount to mark, guarantee not deformation damage when using; And the operation of the pneumatic valve pneumatic valve stem should have enough size, such as enough to ensure that the pneumatic valve opening and closing times service life.
3, maintenance
pneumatic valve maintenance and maintenance shall have the guidance of professional and technical personnel. Pneumatic valve belongs to pressure components, and some pneumatic valve opening and closing operation frequently, pneumatic valve, pneumatic valve stem seal erosion and corrosion by the medium, so you need to check the situation of pneumatic valve sealing connection parts, when packing for leaks, packing should be filling packing and proper preload bolt, but intensified shoulds not be too tight to prevent wear and tear. Packing too tight will also make the operating torque is too large, affect the sealing.