What is the reason of internal leakage of oil and gas pipeline valves？

As we all know, the importance of valve in the oil and gas pipeline is irreplaceable, not only can adjust the pressure of the pipeline, but also can distribute the flow direction of the medium, to a certain extent to ensure the safe transportation of the pipeline line. If we do not know the cause of leakage in valve, it may bring serious safety risks.

So, this passage is mainly about the cause analysis of valve internal leakage.

 (1) Valve leakage caused by improper switch limit

Improper switch limit adjustment is one of the main causes of valve leakage. However, due to the shrinking neck in the plug valve, the internal leakage of the medium can only be caused when the ball closure is 10 ~ 15 degrees away from the valve body.

（2）Valve internal leakage caused by impurities in the valve

The presence of impurities in the valve is another cause of leakage. These impurities can be sand, stones, rust, dust, etc., but also can be welding rods, wood rods, plastic products and other tools. Valve manufacturers in the process of production of valves, if the water pressure test is not done well after drainage, drying, corrosion protection and lubrication grease, etc., it is easy to cause internal rust of the valve, resulting in the production of pipe valve leakage phenomenon. In the process of installing oil and gas pipeline, if the protection work of pipeline is not done well, sediment, sewage and impurities may enter the pipeline, and the phenomenon of valve leakage may occur.

(3) Internal leakage of valve caused by damage of sealing surface

As the pipeline works, oil and gas scour the pipeline for a long time. If there is a small area of damage in the pipeline during transportation, the small damage will become a big damage, which will lead to oil and gas leakage. In the actual pipeline work, if the violent loading and unloading or hoisting method is not reasonable, it will cause the integrity of the valve to be damaged, thus causing the leakage of the valve. In the process of welding the valve, if the welding spatter is spilled onto the closing member, the closing member will be damaged, which will cause damage to the sealing surface of the seat when the valve is in operation, further causing internal leakage of the pipeline valve.

(4)Internal leakage of valve caused by improper maintenance

Pipeline maintenance is also a key link to ensure the normal work of oil and gas pipeline industry. In the process of pipeline maintenance, some managers may reduce the number of pipeline maintenance due to the high cost of maintenance, so that the valve shutters and seats are tightly locked, making it difficult to open and close the valve, and finally causing internal leakage of the pipeline valve.

Above all, knowing the cause of leakage in valve is very important for us. Only when we know the cause of the leak can we better prevent it.