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The reason and treatment method of the Industrial valve can’t closed tightly

September 30, 2020

Industrial Valves have some problems during operation, e.g. the valve is not closed tightly. What am I supposed to do?

In normal circumstances, if the valve is not completely closed, first check to see if the valve is closed in place. If it has been closed in place, and the leakage persists, then check the sealing surface. If it is disassembled, take that one out for grinding and test it again. If it is still not tightly closed, it must be returned to the factory to maintain or repair the valve so as not to impact the normal use of the valve and incidents such as working conditions.

When the valve is not closed tightly, you can first figure out where the problem is and then solve it using the right procedure. Generally, there are many reasons why the valve is not closing tightly:

  • Impurities are trapped on the sealing surface and the impurities are collected on the bottom of the valve or between the valve clack and the valve seat.
  • The thread of the valve stem is rusty, and the valve cannot be turned.
  • The sealing surface of the valve has been damaged, allowing the medium to leak.
  • The valve stem and valve clack are not well connected so that the valve clack and the valve seat cannot be in direct contact with each other.

Impurities are trapped on the sealing surface:

Often it is an experience that the valve is not closed tightly, it may be that the impurity is trapped between the sealing surface of the valve or slag is collected at the bottom of the valve preventing it from sticking in the open position. Do not use force to shut the valve at this time. You can open the valve a bit, and then start closing it. The consistency of the medium should be kept clean throughout the inspection. If the problem persists, then the valve should be dismantled and checked thoroughly for problems.

The thread of the valve stem is rusty, and the valve cannot be turned.

In the case of a valve that is normally opened, when it is unintentionally closed because the valve stem thread has rusted, it cannot close tightly. In this case, the valve can be opened and closed several times, and a small hammer can be applied to the bottom of the valve at the same time, and the valve can be firmly closed without grinding or fixing the valve.

The sealing surface of the valve has been damaged.

During the opening and closure of the sealing surface, scratches, bumps, crushing, and other damage can occur. When the two sealing surfaces move along each other, they are likely to be broken apart at the adhesive point. The higher the surface roughness of the sealing surface, the more likely such a phenomenon is to occur, or if the sealing surface is damaged by corrosion or particle scratches in the medium, it should be reported for repair.

The valve stem and valve clack are not well connected.

One of the most neglected but inexpensive aspects of valve maintenance is greasing or lubrication. Avoiding this process can lead to seizures or, at the very least, reduced performance. Regular lubrication can also help seal the valves, prolonging the service life of the valve. The trick is to rotate the valve to help ensure that the lubricant is in the valve cavity. This will extend the life of the valve by restricting its wear. Depending on the setting, the valve maintenance will require you to choose the correct lubrication for your valve. Lubricants have a range of characteristics, so don’t just use the first thing you get. They can be water-resistant, lithium-based, high-temperature, carbon-resistant, and more. Sticky lubricants, for example, may have incorporated clay or other solid-based thickeners, which may harden and leave solids behind in the valve, allowing it to seize. In addition to lubricating valves, you can also need to protect them from changes in ambient temperature, particularly if the pipes are outside. If this is the case, the addition and maintenance of the protective insulation will need to be added to your valve maintenance routine.


Valve maintenance might feel like a little inconvenience, but a few minutes of your attention will go a long way to keeping the machine running smoothly, which will save you time and money in the long run. Ignoring valve repair will leave you trapped with malfunctioning devices, tubing, or pipes, causing you to remove parts and probably replace them.


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