Precautions for installation and use of electric control valve

Precautions during installation and use The
newly designed and installed control system, in order to ensure that the regulating valve can work normally when driving, and make the system operate safely, before installing the new valve, first check whether the nameplate mark on the valve meets the design requirements Match. At the same time, the following items should be debugged.
Basic error limit; full stroke deviation; return difference; dead zone; leakage (in strict requirements).
If the control valve in the original system has been overhauled, in addition to checking the above items, the stuffing box and joints of the old valve should also be checked for tightness.
In the field use, many are not caused by the quality of the regulating valve itself, but caused by improper installation and use of the regulating valve, such as the installation environment, improper installation position and direction, or unclean pipelines. Therefore, the following aspects should be paid attention to when installing and using the electric regulating valve:
1. The regulating valve is a field instrument, and the ambient temperature should be in the range of -25～60℃, and the relative humidity should be ≤95%. If it is installed in the open air or in a high-temperature place, waterproof and cooling measures should be taken. Keep away from the vibration source or increase anti-vibration measures where there is a seismic source.
2. The electric control valve should generally be installed vertically, and can be tilted under special circumstances. For example, when the tilt angle is large or the valve itself is too heavy, the valve should be protected by supporting parts.
3. Generally, the pipeline for installing the electric control valve should not be too high from the ground or the floor. When the pipeline height is greater than 2m, a platform should be set as far as possible to facilitate the operation of the hand wheel and facilitate the maintenance.
4. The pipeline should be cleaned before installation of the electric control valve to remove dirt and welding slag. After installation, in order to ensure that no impurities remain in the valve body, the valve should be cleaned again, that is, all valves should be opened when the medium is introduced to prevent impurities from getting stuck. After using the handwheel mechanism, it should be restored to the original neutral position.
5. In order to enable the production process to continue in the event of malfunction or maintenance of the electric control valve, a bypass pipeline should be added to the electric control valve.
At the same time, special attention should be paid to whether the installation position of the electric control valve meets the requirements of the process.
6. The electrical part of the electric control valve should be installed according to the construction requirements of the relevant electrical equipment. If it is an explosion-proof product, it should be installed in accordance with the requirements of the Installation Specification for Electrical Equipment in Explosive Hazardous Locations. For example, the field wire adopts SBH type or other six-core or eight-core rubber installation cable with an outer diameter of about 11.3mm. During use and maintenance, it is strictly forbidden to open the cover for maintenance and pry on the explosion-proof surface in explosive places. At the same time, do not knock or scratch the explosion-proof surface during disassembly and assembly, and restore to the original explosion-proof requirement state after maintenance.
7. Pay attention to lubrication after dismantling and repairing the reducer of the actuator. Generally, do not disassemble, wash and refuel the low-speed motor. After assembly, check whether the valve position is consistent with the valve position opening indication.