You before the welding operation before and after commissioning check valve professional maintenance work, valve manufacturing operations in the service plays a vital role in the correct and orderly and effective maintenance will protect the check valve, the check valve function and prolong the service life of check valve. The maintenance work of the check valve seems simple, but it is not. There are often neglected aspects of work.
Two, the maintenance work of the check valve when the grease is injected
Before the welding operation before and after operation of the check valve professional maintenance work, valve manufacturing operations in the service plays a vital role in the correct and orderly and effective maintenance will protect the check valve, the check valve to function properly and extend the service life of the check valve. The maintenance work of the check valve seems simple, but it is not. There are often neglected aspects of work.
First, when the check valve is injected, the problem of fat injection is often ignored. After the grease gun is refueling, the operator chooses the check valve and the combination of grease injection to carry out the grease injection operation. There are two kinds of conditions: on the one hand, less fat injection is insufficient, and the sealing surface accelerated wear because of lack of lubricant. On the other hand, excessive fat injection makes waste. It is not based on the type of check valve type to accurately calculate the sealing capacity of different check valves. The seal capacity can be calculated with the size and category of the check valve, and a reasonable amount of grease can be injected.
Second. When the check valve is injected, the pressure problem is often ignored. In the operation of lipid injection, the pressure of fat injection regularly changes in the peak and valley. Low pressure seal leakage or failure, the pressure is too high, the injection port plug seal within the lipid hardening or sealing ring and the ball valve, valve plate locking. Usually, when the grease pressure is too low, the grease injected into the bottom of the valve cavity usually occurs in the small gate valve. The grease pressure is too high, on the one hand to check the grease mouth, such as pore blocking fat replacement to identify the situation; on the other hand is the lipid hardening, to use the cleaning fluid, repeated failure to soften the seal fat, and inject new grease replacement. In addition, seal type and sealing material also affect the grease injection pressure. Different sealing forms have different grease injection pressure. Generally, the grease pressure of hard seal is higher than that of soft seal.