Precautions for installation and use of electric control valve
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1 Installation and use precautions 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 matches the design requirements. At the same time, the following items should be debugged.
Basic error limit; full stroke deviation; hysteresis; dead zone; leakage (when required)
If the control valve in the original system is overhauled, in addition to the above-mentioned items, the sealing check of the stuffing box and joints of the old valve should be checked.
In the field use, many are often 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 the pipeline is not clean. Therefore, the electric control valve should pay attention to the following aspects when installing and using:
(1) The regulating valve belongs to the field instrument, and the ambient temperature should be in the range of -25 to 60 °C, and the relative humidity is ≤ 95%. If it is installed in open air or high temperature, waterproof and cooling measures should be taken. Keep away from vibration sources or increase anti-vibration measures where there is a source.
(2) The regulating valve should generally be installed vertically. Under special circumstances, it can be tilted. If the tilt angle is large or the valve itself is too heavy, the support should be added to the valve.
(3) The pipe for installing the regulating valve should not be too high from the ground or the floor. When the pipe height is greater than 2m, the platform should be set as much as possible to facilitate the operation of the handwheel and easy maintenance.
(4) Before the installation of the regulating valve, the pipeline should be cleaned to remove dirt and welding slag. After installation, in order to ensure that impurities do not remain in the valve body, the valve should be cleaned again, that is, all valves should be opened when the medium is introduced to avoid impurities jamming. After using the handwheel mechanism, you should return to the original neutral position.
(5) In order to make the production process continue in the event of failure or maintenance of the regulating valve, the regulating valve should be added with a bypass line.
At the same time, special attention should be paid to whether the installation position of the regulating valve meets the requirements of the process.
(6) The electrical part of the electric control valve shall be installed in accordance with the relevant electrical equipment construction requirements. If it is a flameproof product, it should be installed in accordance with the requirements of the "Installation Specifications for Electrical Equipment in Explosive Hazardous Locations". For example, the field conductor adopts SBH type or other six-core or eight-core rubber outer diameter cable with a diameter of about 11.3mm. In the use of maintenance, it is strictly forbidden to open the cover and repair the explosion-proof surface in the explosive place. At the same time, do not scratch or scratch the explosion-proof surface during disassembly and assembly, and restore it to the original explosion-proof requirement state after maintenance.
(7) After the gear unit of the actuator is disassembled, attention should be paid to lubrication. Low-speed motors are generally not required to be disassembled and refueled. After assembly, check that the valve position matches the valve position opening indication.