How to correctly install the electric valve

Release time:

25 Oct,2023

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In order to ensure that the electric valve can work correctly and reliably after it is put into operation, in addition to ensuring the correct installation of the electric device, attention should also be paid to the installation of the valve. When installing the valve, attention should be paid to the requirements of its supporting work with the electric device.

When the electric valve is installed, the electric device is composed of the electric valve together with the valve.

The installation conditions of the electric device depend to a large extent on the installation of the valve.

(1) The valve should be installed on a horizontal pipe as much as possible and the valve body should be vertical (the valve stem is vertical and above the horizontal line). This is because the best position of the electric device is vertical installation (output sodium vertical position, and installed above the valve body). From the valve itself, the vertical installation is also beneficial, because the vertical installation is easy to repair and maintain; and horizontal installation, due to the uneven temperature of the valve components, the sealing structure is easy to discharge pulse is not easy to repair.

(2) The rotation direction of the valve stem nut should be consistent with the rotation direction of the output shaft of the electric device. Seen from the valve stem end, the valve stem nut tilts in the clockwise direction to close the valve; rotates in the counterclockwise direction to open the valve, and this rotation direction is the standard rotation direction of the valve. When the rotation direction is inconsistent with the standard rotation direction, the valve should be modified, because it is much more difficult and sometimes even impossible to modify the electric device.

(3) The operating mechanism of important valves should be led to the position easily reached by the personnel on duty, such as the platform with the same elevation of the control room. At this time, the electric device is installed on the floor and connected to the valve through a universal coupling.

(4) valve stem nut long points should be assembled correctly and add grease to ensure good lubrication. For high-temperature valves, the valve stem nut part should have a disc spring to absorb the thermal expansion of the valve stem. If the valve lacks a link, the valve stem nut part should be modified according to the field conditions to add a disc spring to absorb the thermal expansion of the valve stem.

(5) The valve should have good insulation to ensure that the working temperature of the electric device can be within its allowable range. For high-temperature valves, in order to reduce the influence of heat conduction on the working temperature of the electric device, the valve bracket should have sufficient height to ensure that the working temperature of the electric device can be within its allowable range. When it is difficult to extend the bracket, a heat sink can also be installed on the valve cover and the bracket to ensure the normal working temperature of the electric persuasion device. It can even be installed separately with universal couplings and floor mounts for electric devices and valves. To improve the working conditions of the electric device.

(6) the valve packing should be pressed. In order to ensure the sealing of the packing, it is sufficient to make the radial pressure of the lower layer of the packing exceed the working pressure of the medium in the pipe. Over-compression of the valve stem packing not only can not guarantee the sealing of the packing, but also make the packing lose elasticity and cause leakage.

Keyword:

Valve

Control Valve

The operation method of electric valve and matters needing attention

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The pros and cons of pneumatic valves and electric valves?

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