Self-operated electric control valve use and maintenance methods
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Release Time：2018-05-14
With the rapid development of China's industry, electric control valve in metallurgy, petrochemical and other fields of application more and more widely, its stability, reliability is becoming more and more important, its working condition will directly affect the automatic control process, Wuhan Xiete Valve Technology Co., Ltd. will elaborate on the use and maintenance of electric control valve. Precautions for installation and use of 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 is consistent with the design requirements. The following items shall also be commissioned. Basic error limit;
With the rapid development of China's industry, electric control valve in metallurgy, petrochemical and other fields of application more and more widely, its stability, reliability is becoming more and more important, its working condition will directly affect the automatic control process, Wuhan Xiete Valve Technology Co., Ltd. will elaborate on the use and maintenance of electric control valve.
Precautions for installation and use
For 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 on the valve is consistent with the design requirements. The following items shall also be commissioned.
Basic error limit; full travel deviation; return difference; dead zone; leakage (in strict occasions).
If the control valve in the original system has been overhauled, in addition to the above-mentioned calibration, but also to deal with the old valve stuffing box and joints and other parts of the sealing inspection.
Regulating valve in the use of the field, many often not because of the control valve itself caused by the quality, but the installation of the control valve caused by improper use, such as the installation environment, installation position and direction of improper or pipeline is not clean and other reasons. Therefore, the electric control valve in the installation and use should pay attention to the following aspects:
(1) The regulating valve belongs to the field instrument, and the ambient temperature is required to be-25～60℃, relative humidity ≤95%. If it is installed in the open air or high temperature occasions, should take waterproof, cooling measures. Where there is a source, keep away from the source or increase anti-vibration measures.
(2) regulating valve should generally be installed vertically, under special circumstances can be tilted, such as the tilt angle is very large or the valve itself is too heavy on the valve should increase the support protection.
(3) the installation of the control valve pipeline generally do not from the ground or the floor is too high, in the pipeline height is greater2mThe platform shall be set as far as possible to facilitate the operation of the handwheel and the maintenance.
(4) The pipeline shall be cleaned before the installation of the regulating valve to eliminate 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 passing into the medium to avoid impurities stuck. After using the handwheel mechanism, it should be restored to the original neutral position.
(5) In order to make the control valve in the event of failure or maintenance so that the production process can continue, the control valve should be added by-pass pipeline.
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 should be installed according to the construction requirements of the relevant electrical equipment. At the same time, do not knock or scratch the flameproof surface during disassembly and assembly, and restore it to the original flameproof state after maintenance.
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