About the importance of valve maintenance

For a long time, most of the domestic industry adopts the form of new for old, the replaced valve when the waste thrown away or sold. Especially multi-purpose flanged valve industry. And to replace the high pressure, high temperature, large valve to repair, but do not know how to repair. Most are still in the manual repair stage. It can be said that in China's valve maintenance industry, waste and benefits are huge.

Due to the lack of concepts and equipment for valve maintenance and maintenance, only nuclear power plants in China can basically repair all valves during each shutdown. Broken repair is a kind of non-maintenance maintenance, which is more adverse to the safe operation of the whole set of equipment and the service life of the valve, its potential emergency shutdown accident is very dangerous, the resulting loss is also huge.

If the valve in the case of no maintenance maintenance, once the leakage is often very serious, which not only increases the difficulty of repair, but also often even has lost the possibility and value of maintenance. Therefore, for the organization and management of the valve maintenance work, not only the relevant personnel should have the corresponding awareness, more important is the prevention and maintenance measures, that is, the regular inspection of the valve.

1, why straight travel arrangement regulating valve stem is thin.

It involves a simple mechanical design basis: Rolling friction, rolling friction small, straight scheduling fitness movement around the valve stem, packing a little tighter, it will cut stem package too tight, cause a lot of return difference, therefore, the valve stem design non-electric globe valve is often subtle, packing and common small friction resistance of ptfe packing, easy to cut back to the poor, but from the eduction is the question of stem thin, easy to bend, Packing and short service life and deal with this problem, the better way is to use brigade rotary valve stem, the Angle of scheduling classes of regulating valve, the valve lever than straight scheduling the welding welding plant stem thick 2 ~ 3 times, and the long service life of high purity graphite packing, good stem bending rigidity, packing service life is long, but the friction torque is small, poor little back.

2, why take off the normal saline medium application of rubber lined pipeline disc valve, fluorine lined diaphragm valve application cycle is short.

Off saline medium with low concentration of acid or alkali, high-temperature high-pressure valve they has a lot of corrosion to plastic, plastic erosion is mainly for swell, embrittlement, compressive strength is low, with rubber lining pipeline disc valve, pneumatic butterfly valve application actual effect is bad, its essence is plastic not cause corrosion, after lining rubber diaphragm valve to improve corrosion resistance good fluorine-butterfly diaphragm valve, But the pulse damper of fluorine lined diaphragm valve can not help folding and knife gate valve is broken, resulting in reflective destruction, the time of the valve is reduced, now the best way is to solve the special type of tap water valve, it can be applied to 5 ~ 8 years.