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How to maintain and maintain electric valves

by:Sino Valves     2021-03-03
The function of electric valve is mainly to isolate equipment and piping system, adjust flow, prevent backflow, adjust and discharge pressure. It is a control element in fluid piping system, and its role is extraordinary. Therefore, it is necessary to pay attention to valve maintenance and maintenance during normal use. Let me introduce the daily maintenance methods of the valve. 1. Daily maintenance of the electric valve 1. Pay attention to the storage environment of the valve. It should be stored in a dry and ventilated room and block both ends of the passage. 2. The valve should be inspected regularly, the dirt on it should be removed, and anti-rust oil should be applied to its surface. 3. The electric valve after installation and application should be regularly checked and repaired to ensure its normal operation. 4. Check whether the sealing surface of the electric valve is worn or not, and repair or replace it according to the situation. 5. Check the wear of the trapezoidal thread of the valve stem and the valve stem nut, whether the packing is out of date and invalid, etc., and replace it if necessary. 6. The sealing performance of the electric valve should be tested to ensure its performance. 7. The electric valve in operation should be intact, the bolts on the flange and the bracket are complete, the thread is not damaged, and there is no looseness. 8. If the handwheel is lost, it should be prepared in time and cannot be replaced with an adjustable wrench. 9. The packing gland is not allowed to be skewed or without pre-tightening gap. 10. If the electric valve is used in a harsh environment and is easily contaminated by rain, snow, dust, sand and other dirt, a protective cover should be installed for the valve stem. 11. The ruler on the valve should be complete, accurate and clear, and the valve should be sealed and capped. 12. The insulation jacket should be free of dents and cracks. 13. Avoid knocking on the valve during operation, or supporting heavy objects. 2. Maintenance of electric valves during grease injection. Professional maintenance of valves before and after welding plays a vital role in the production and operation of valves. Correct, orderly and effective maintenance will protect the valves. The valve makes the valve function normally and prolongs its service life. Valve maintenance may seem simple, but it is not. There are often overlooked aspects of work. 1. When the electric valve is injected with grease, 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 there is no accurate calculation of the sealing capacity of different valves according to the valve type category. The sealing capacity can be calculated based on the valve size and type, 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 fat injection operation, the fat injection pressure changes regularly. The pressure is too low, the seal leakage or failure pressure is too high, the grease injection port is blocked, the seal inner grease is hardened, or the seal ring is locked with the valve ball and valve plate. Usually when the grease injection pressure is too low, the injected grease mostly flows into the bottom of the valve 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 hole is blocked, replace it; on the other hand, if the grease is hardened, use a cleaning fluid to repeatedly soften the failed sealing grease and inject new grease to replace it. . In addition, the type and material of the seal also affect the grease injection pressure. Different sealing forms have different grease injection pressures. Generally, the grease injection pressure of a hard seal is higher than that of a soft seal.
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