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Maintenance of electric valve in operation

by:Sino Valves     2021-02-26
Maintenance of electric valve during operation The purpose of maintenance during operation of electric valve is to ensure that the valve is in a state of cleanliness, good lubrication, complete valve parts and normal operation all year round. (1) Cleaning of the electric valve. The surface of the valve, the trapezoidal thread on the valve stem and the valve stem nut, the sliding part of the stem nut and the bracket, and the dirt such as gears, turbines and medium residues will cause wear and corrosion to the valve. Therefore, it is obviously very important to keep the exterior and moving parts of the electric valve clean and to protect the integrity of the electric valve paint. The dust on the electric valve is suitable for brush sweeping and compressed air blowing; the trapezoidal thread and the dirt between the teeth are suitable for wiping with a rag; the oil and medium residues on the electric valve are suitable for steam blowing, even with a copper wire brush Brush until the machined surface, the mating surface shows a metallic luster, and the painted surface shows the true color of the paint. The trap should be inspected by a dedicated person at least once per shift. The flush valve and the plug at the bottom of the trap should be opened regularly for flushing, or should be disassembled and flushed regularly to avoid dirt blocking the electric valve. (2) The lubrication valve trapezoidal thread of the electric valve, the sliding part of the stem nut and the bracket, the bearing part, the meshing part of the gear and the worm gear, the worm and other coordinated movable parts, all need good lubrication conditions to reduce mutual friction and avoid Wear each other. Some parts are specially equipped with oil cups or nozzles. If they are damaged or lost during operation, they should be repaired and the oil circuit should be dredged. Lubrication parts should be regularly oiled according to specific conditions. Frequently opened valves with high temperature are suitable for refueling once a week to a month; valves with infrequent openings and low temperature may have a longer refueling cycle. Lubricants: organic oil, butter, molybdenum disulfide and graphite, etc. High-temperature electric valves are not suitable for lubricating oil and butter, which will be lost due to high-temperature melting, and are suitable for injection of molybdenum disulfide and graphite powder for lubrication. For exposed parts that need to be lubricated, such as trapezoidal threads, gears, etc., if grease such as butter is used, it is easy to be contaminated with dust, while molybdenum disulfide and graphite powder are used for lubrication, and the lubrication effect is better than that of butter. Graphite powder is not easy to apply directly, it can be used in paste form with a little oil or water. The oil-filled plug valve should be filled with oil at the specified time, otherwise it is easy to wear and leak. (3) Grease injection of electric valve ① When the valve is greased, the problem of grease injection is often ignored. After the grease gun is refueled, the operator selects the valve and the grease injection connection mode, and then performs the grease injection operation. There are two situations: on the one hand, the amount of grease injection is small and the grease injection is insufficient, and the sealing surface wears faster due to lack of lubricant. On the other hand, excessive grease injection causes waste. The reason is that the sealing capacity of different valves is not accurately calculated according to the valve type category. The sealing capacity can be calculated based on the valve size and category, and then a reasonable amount of grease can be injected. ② When the electric valve is greased, the pressure problem is often ignored. During the grease injection operation, the grease injection pressure changes regularly in peaks and valleys. If the pressure is too low, the seal leaks or fails! If the pressure is too high, the grease injection port is blocked, the sealing grease is hardened or the sealing ring is locked with the ball or the gate. Usually when the grease injection pressure is too low, the injected grease mostly flows into the bottom of the mesh cavity, which usually occurs in small gate valves. If the grease injection pressure is too high, on the one hand, check the grease injection nozzle. If the grease injection hole is blocked, replace it; on the other hand, if the grease is hardened, use cleaning fluid to repeatedly soften the failed sealing grease and inject new grease. Replacement. In addition, the seal type and sealing material also affect the grease injection pressure. Different sealing forms have different grease injection pressures. Generally, the grease injection pressure for hard seals is higher than that for soft seals. ③ When injecting grease on an electric valve, pay attention to the problem of the valve at the switch position. The ball valve is generally in the open state during maintenance, and in special circumstances, it is selected to be closed for maintenance. Other valves cannot be treated as open states. The electric gate valve must be closed during maintenance to ensure that the grease fills the sealing groove along the sealing ring. If it is open, the sealing grease will directly fall into the flow path or valve cavity, causing waste. ④ When the electric valve is injecting grease, the problem of the grease injection effect is often ignored. During the grease injection operation, the pressure, the amount of grease injection, and the switch position are all normal. However, in order to ensure the effect of valve grease injection, it is sometimes necessary to open or close the valve to check the lubrication effect to confirm that the surface of the electric valve ball or gate is evenly lubricated. ⑤ When injecting grease, pay attention to the problem of valve body drainage and plug pressure relief. After the pressure test of the electric valve, the gas and moisture in the valve cavity of the sealed chamber will increase in pressure due to the increase of the ambient temperature. When the grease is injected, the sewage and pressure must be discharged first to facilitate the smooth progress of the grease injection. After grease injection, the air and moisture in the sealed cavity are fully replaced. Relieve the valve cavity pressure in time, which also guarantees the safety of the valve. After the grease injection, be sure to tighten the drain and pressure relief plugs to prevent accidents. ⑥ When injecting grease, pay attention to the problem of uniform grease. In normal grease injection, the grease outlet closest to the grease injection port first discharges grease, then to the low point, and finally to the high point. If it does not follow the rules or does not produce fat, it proves that there is a blockage, and it should be cleared in time.
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