1. The COMPACT BALL VALVE X9002 should be stored in a dry and ventilated room, and both ends of the passage must be blocked.
2. Valves stored for a long time should be checked regularly to remove dirt and apply anti-rust oil on the processing surface.
3. After installation, regular inspections should be carried out, the main inspection items:
(1) Wear condition of sealing surface.
(2) Wear of trapezoidal threads of valve stem and valve stem nut.
(3) Whether the packing is out of date and invalid, if it is damaged, it should be replaced in time.
(4) After the valve is overhauled and assembled, a sealing performance test should be carried out.
Maintenance work during valve grease injection
The maintenance of the valve before and after the welding process plays an important role in the production and operation of the valve. Correct, orderly and effective maintenance will protect the valve, make the valve function normally and prolong the use of the valve. life. Valve maintenance may seem simple, but it is not. There are often overlooked aspects of work.
1. When the valve is injecting grease, the problem of the amount 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 fat injection causes waste. The reason is that there is no calculation for different valve sealing capacities 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 valve is greased, the pressure problem is often ignored. During the fat injection operation, the fat injection pressure changes regularly in peaks and valleys. If the pressure is too low, the seal leaks or fails, the pressure is too high, the grease injection port is blocked, the grease in the seal is hardened, or the sealing ring is locked with the valve ball and valve plate. Generally, 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 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 should be the most flexible seal.
3. When the valve is greased, pay attention to the problem of the valve in the switch position. The ball valve is generally in the open position during maintenance. In special cases, it is selected to be closed for maintenance. Other valves cannot be treated as open positions. The gate valve must be closed during maintenance to ensure that the grease fills the sealing groove along the sealing ring. If it is opened, the sealing grease will directly fall into the flow channel or valve cavity, causing waste.
4. When the valve is greased, the problem of grease injection effect is often ignored. During the grease injection operation, the pressure, grease injection volume, and 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 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 valve pressure test, the gas and moisture in the valve cavity of the sealed cavity will increase in pressure due to the increase of ambient temperature. When grease is injected, the sewage and pressure must be discharged to facilitate the smooth progress of the grease injection. After the grease is injected, 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 plug to prevent accidents.
6. When injecting grease, pay attention to the problem of uniform grease output. During normal grease injection, the grease outlet closest to the grease injection port will discharge first, then to the low point, and then to the high point after the last, and then discharge the grease successively. If it does not follow the rules or does not produce fat, it proves that there is a blockage, and clear it up in time.
7. When injecting grease, also observe the flushing problem of valve diameter and sealing ring seat. For example, for ball valves, if there is an open position interference, the open position limiter can be adjusted inward to confirm that the diameter is straight and locked. To adjust the limit position, you should not only pursue the opening or closing position, but should consider the overall position. If the opening position is flush and the closing position is not in place, the valve will not close tightly. In the same way, if the adjustment is in place, the corresponding adjustment of the open position should also be considered. Ensure the right angle travel of the valve.
8. After grease injection, the grease injection port must be sealed. Avoid the entry of impurities or the oxidation of lipids at the grease injection port. Anti-rust grease should be applied to the cover to avoid rust. So that it can be applied in the next operation.
9.Nine, when injecting grease, it is also necessary to consider the specific treatment of specific problems in the sequential transportation of oil products in the future. In view of the different qualities of diesel and gasoline, the scour and decomposition ability of gasoline should be considered. In the future valve operation, when encountering gasoline segment operations, replenish grease in time to prevent wear.
10. When injecting grease, do not ignore the grease injection on the valve stem. There is a sliding sleeve or packing on the valve shaft, which also needs to be kept lubricated to reduce frictional resistance during operation. If lubrication cannot be ensured, the torque will increase during electric operation and wear parts will be laborious during manual operation.
11. Some ball valves are marked with arrows on the valve body. If there is no English FIOW writing, it is the direction of action of the sealing seat, which is not used as a reference for the flow direction of the medium, and the direction of the valve self-discharge is opposite. Normally, a double-seat sealed ball valve has a bidirectional flow direction.
12. When maintaining the valve, pay attention to the water ingress in the electric head and its transmission mechanism. Especially the rain that seeps in during the rainy season. One is to rust the transmission mechanism or the transmission shaft sleeve, and the other is to freeze in winter. Cause the torque to be too large when the electric valve is operated, and damage to the transmission parts will cause the motor to be unloaded or the *torque protection will be tripped and electric operation cannot be realized. The transmission parts are damaged, and manual operation cannot be performed. After the *torque protection is activated, manual operation also cannot be switched. Forcible operation will damage the internal alloy parts.
Post time: Jan-18-2022