Installation and Operation of Valves

After selecting the appropriate valve, it is necessary to install, maintain and operate it properly. This is to ensure that each part of the station performs its role properly and with the best efficiency. The quality of valve installation directly affects its use, so it must be carefully paid attention to. Therefore, it is necessary to deal with experts and technicians in everything related to the installation and operation of valves.

Direction

Many valves have directionality, such as globe valves, throttle valves, pressure relief valves, check valves, etc. If it is installed in reverse, it will affect the service effect and service life (such as the throttle valve), or will not work at all (such as the pressure relief valve), or even cause danger (such as check valve). Generally, the valve has direction marks on the valve body; if not, it should be correctly selected according to the working principle of the valve.

For example: the globe valve chamber is asymmetric from left to right, and the fluid should pass through the valve port from bottom to top, so that the fluid resistance is small, and the opening and closing is labor-saving. The medium does not press the package after closing, which is convenient for maintenance. Other valves also have their own characteristics.

Location

The installation position of the valve should be convenient for the personnel to operate. It is best to align the hand valve wheel with the chest (usually 1.2 meters away from the operating ground), which saves labor when opening and closing. To avoid incorrect operation, the hand valve wheel should be on the ground up and not tilted. For valves close to walls and equipment, there should be space for operators to stand, so as to avoid operators operating upwards (especially when the medium is toxic, it is very unsafe).

Gate valve:

Do not install upside down (that is, the hand wheel is down), otherwise, the medium will stay in the cover for a long time, which will easy to corrode the valve stem. It is not only very inconvenient to replace the package but also prohibited by some process requirements.

Rising column gate valve:

Do not install it underground, otherwise the exposed valve rod will be corroded by moisture.

Lifting check valve:

During installation, the valve disc should be vertical to facilitate flexible lifting.

Swing check valve:

During installation, the pin shaft should be horizontal to facilitate a flexible swing.

Pressure relief valve:

It should be installed vertically on the horizontal pipe without tilting in all directions.

Construction process for right Operation of Valves

Never hit the valve made of brittle materials during construction. Before installation, the personnel should inspect the valves one by one, check the specifications and models, determine whether there is damage, rotate the valve shaft and judge whether it is skewed (the valve shaft is likely to be hit during transportation), and remove the sundries in the valve. In order to avoid damaging the components, when lifting the valve, the personnel should not tie the rope to the hand wheel or valve stem but should tie it to the flange.

For pipe connection valves:

Pipe connection valves should be cleaned. Compressed air can be used to blow out iron oxide chips, mud, sand, welding slag, etc. These materials not only scratch the sealing surface of the valve but also clog the small valve and make it invalid.

Threaded valves:

This is to prevent the accumulation in the valve and affect the flow of media. The sealing gasket should be wrapped around the pipe thread and should not be placed in the valve.

Flanged valves:

To prevent the valve from generating excessive pressure and causing cracking, the valve flange and the pipe flange should be parallel.

Pipe-welded valves:

First, the staff should do spot welding, then fully open the sealed parts, and finally weld them.

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