Description of maintenance work during vacuum valve filling

Professional maintenance of valves before and after production before welding, the valve plays a vital role in the production and operation. Correct and orderly and useful maintenance will maintain the valve, make the valve function properly and extend the valve operation. life. Valve maintenance work seems to be simple, but it is not. There are often neglected aspects of homework.

When the top of the list and the valve are greased, the problem of the amount of grease is often ignored. After the grease gun is refueled, the operator selects the valve and the grease injection method to perform the grease filling operation. There are two conditions: on the one hand, the amount of grease is less than the lack of grease, and the sealing surface is accelerated by the lack of lubricant. On the other hand, excess fat is injected, resulting in waste. There is no accurate calculation of the different valve sealing capacities based on the valve type category. The sealing capacity can be calculated in terms of valve size and type, and a proper amount of grease can be injected reasonably.

Second, when the valve is greased, the pressure problem is often neglected. During the grease filling operation, the grease pressure changes regularly in peaks and valleys. The pressure is too low, the seal leakage or failure pressure is too high, the grease injection port is blocked, the seal grease is hardened or the seal ring is locked with the valve ball and the valve plate. Generally, when the grease pressure is too low, the injected grease flows into the bottom of the valve chamber, which generally occurs in a small gate valve. However, the pressure of the grease is too high. On the one hand, the grease injection nozzle is observed, and if the grease hole is blocked, the condition is replaced; on the other hand, the grease is hardened, and the cleaning liquid is used to repeatedly soften the failed sealing grease and inject a new grease. .

In addition, the type of seal and the sealing material also affect the grease filling pressure. Different sealing forms have different grease filling pressures. In general, the hard seal grease pressure is higher than the soft seal.