Instrument pneumatic valve fault maintenance

instrument pneumatic valve body outside the main fault components are pneumatic valve, pneumatic valve core, pneumatic valve seat, often should check the pneumatic valve body wall corrosion and wear, especially for corrosive medium and high pressure difference, negative process conditions, such as cavitation, pneumatic valve, must ensure that the compression strength and corrosion resistance, abrasion resistance performance; Pneumatic valve core have the effect of regulating and cutting fluid, is the activity of throttling element, therefore the medium in the most serious erosion, corrosion, particle collision, under the condition of high pressure and cavitation are more likely to be damaged, so want to check it whether the parts damage, wear, corrosion, whether to repair or replacement. Pneumatic valve seat joint surface is the key to guarantee the pneumatic valve closed, its corrosion wear situation is serious, as a result of the medium permeability, make within the thread fixed pneumatic valve seat surface from corrosion and loose, often to check the parts.
at different positions of the different types of pneumatic valve adjustment and has some key element, the element is also easy to the failed components, such as pneumatic, hydraulic actuator, pneumatic diaphragm of diaphragm, diaphragm is one of the most important components. Under the normal operation of the air supply system, if the actuator is not action, it should be thought that if diaphragm rupture, if not installed. When the surface of the metal contact surfaces have sharp corners, burrs will make diaphragm when defects such as broken, and the diaphragm leakage can be absolute. In addition, the diaphragm use time is too long, material aging will also affect to use. Pneumatic, hydraulic actuator piston driving force, so the damage of the piston, wear is absolutely not allowed. Songs ( Liquid) Tube is input pressure leads to the pathway of the actuator, so often should check whether the prison, not a flat. Push rod to check the push rod bending and deformation, fall off. Position of push rod connected with the pneumatic valve lever wants firm, to adjust, so as to ensure enough and close the pneumatic valve. Spring to check whether there is any fault on spring, manufacturing, processing and improper heat treatment can make spring fracture, some spring under the effect of excessive load, may rupture.
the pneumatic valve is under pressure of mechanical products, and therefore must have sufficient strength and rigidity, so as to ensure the long-term use without cracking or deformation. Pneumatic valve pneumatic valve sealing performance refers to the ability of the sealing parts prevent leakage of medium, it is the most important technical performance index of the pneumatic valve. Pneumatic valve sealing part three: opening and closing parts and pneumatic seat the contact point between the two sealing surface; Packing and pneumatic valve stem and gland and blending; The joint of pneumatic valve and pneumatic valve cover. One former place called internal leakage of leakage, known as the closed lax, it will affects the ability of the pneumatic valve block medium. For truncation of pneumatic valve, leakage is not allowed. After the two called the leakage of leakage, the medium from the pneumatic valve leakage to the outside of the pneumatic valve. Leakage would cause material loss, environmental pollution, serious when still can cause accidents. For flammable and explosive, toxic or radioactive medium, leakage is not allowed, so pneumatic valves must have a reliable sealing performance.