The work week is coming to an end again. After working hard for a week, do you remember what we learned last time? If you forget, just follow the editor to review it. Last week we talked about the three points of how to maintain the valve, storage and maintenance, use and maintenance, and packing maintenance. So let us continue to look down today~
Transmission parts maintenance
◆During the opening and closing of the valve, the lubricating grease originally added will continue to be lost, coupled with the effects of temperature, corrosion and other factors, the lubricating oil will also continue to dry up. Therefore, the transmission part of the valve should be checked frequently, and when it is found that the oil is lacking, it should be added in time to prevent the increase of wear due to lack of lubricant, resulting in inflexibility or jamming failure and other faults.
◆When maintaining the valve, pay attention to the water ingress in the electric head and its transmission mechanism. Especially in the rainy season the infiltration of rainwater. 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 components will cause the motor to be unloaded or the over-torque protection will be tripped and electric operation cannot be realized. The transmission parts are damaged, and manual operation cannot be performed. After the over-torque protection is activated, manual operation also cannot be switched. Forcible operation will damage the internal alloy parts.
Maintenance during valve grease injection
◆Pressure problem: 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, the pressure is too high, the grease injection port is blocked, the sealant 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. .
◆The problem of the valve in the switch position: The ball valve is generally in the open position during maintenance. In special circumstances, 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 open, the sealing grease will directly fall into the flow path or valve cavity, causing waste.
◆Grease effect problem: pressure during grease injection operation , Grease injection volume and switch position are all normal. But 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.
◆The problem of valve body drainage and plug pressure relief: After the valve pressure test, the sealed cavity valve The pressure of the gas and moisture in the cavity is increased due to the increase of the ambient temperature. When the grease is injected, the pressure must be discharged first 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 is finished, be sure to tighten the drain and pressure relief plug to prevent accidents.
◆The problem of uniform grease output: during normal grease injection, the grease outlet closest to the grease injection port first discharges the grease, then to the low point, and finally Is the high point, one by one fat. If you do not follow the rules or do not produce fat, it proves that there is a blockage, and clear it up in time
◆The valve diameter is flush with the sealing ring seat: For example, if there is an open position interference in a ball valve, the open position limiter can be adjusted inward to confirm that the diameter is straight and locked. Adjusting the limit can not only pursue the opening or closing position, but should be considered as a whole. 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 adjustment of the open position should also be considered. Ensure the right angle travel of the valve
Valve maintenance must be treated with a scientific attitude, so that the valve maintenance work can achieve the desired effect and application purpose. In order to make production run normally, reduce downtime, and increase economic benefits, these three points must be done well in terms of valves.
2. Correct use of valves is the most critical
3. Correct maintenance is the guarantee
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