Precautions for installation and use of the hottes

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Precautions for the installation and use of electric control valves

precautions for the installation and use of electric control valves:

with the rapid development of China's industry, electric control valves are more and more widely used in metallurgy, petrochemical and other fields, and their stability and reliability are also becoming more and more important. The decline of its working state and the risk of users using new materials will directly affect the automatic control process. Precautions for installation and use of electric control valve:

1. For the newly designed and installed control system, in order to ensure that the control valve can work normally during startup 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

2. At the same time, the following items should be debugged. Basic error limit; Full stroke deviation; Return difference; Dead zone; Leakage volume (when the requirements are strict)

3. If the regulating valve in the original system is overhauled, in addition to verifying the above items, the sealing inspection of the stuffing box and joints of the old valve should also be carried out

4. In the field use of regulating valves, many are often not caused by the quality of regulating valves, but by improper installation and use of regulating valves, such as improper installation environment, installation position and direction, or unclean pipelines. Therefore, the following aspects should be paid attention to when installing and using the electric control valve:

(1) the control valve is a field instrument, and the ambient temperature should be in the range of - 25 ~ 60 ℃ and the relative humidity ≤ 95%. If it is installed in the open air or high temperature, waterproof and cooling measures should be taken. Keep away from the vibration source or add anti vibration measures where there is a source

(2) generally, the regulating valve should be installed vertically, and it can be tilted under special circumstances. If the tilt angle is large or the self weight of the valve is too large, the supporting parts should be added to protect the valve

(3) generally, the pipeline installing the regulating valve should not be too high from the ground or floor. When the pipeline height is greater than 2m, a platform should be set as far as possible to facilitate the operation of the handwheel and maintenance

accuracy: level 0.5 (4) before the installation of 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 also be cleaned again, that is, when the medium is introduced, all valves should be opened to prevent impurities from getting stuck. After using the handwheel mechanism, it should be restored to the original neutral position

(5) in order to make the production process continue in case of failure or maintenance of the regulating valve, the regulating valve should be added with a bypass pipeline. At the same time, special attention should be paid to the installation of the regulating valve. 2. Whether the main motor source of the tensile testing machine does not light up meets the requirements of the process

(6) the electrical part of the electric control valve is installed hy ⑴ 0080 microcomputer controlled electronic universal material testing machine. This machine is applicable to the static mechanical property testing, analysis and research equipment of metal (including composite materials), rubber plastic, adhesive materials, such as stretching, tightening, bending, shearing, peeling, tearing, load retaining, etc. according to the construction requirements of relevant electrical equipment. If it is an explosion-proof product, it should be installed in accordance with the requirements of the code for installation of electrical equipment in explosive hazardous areas. If the field conductor adopts SBH type or other six core or eight core, the outer diameter is Φ Install cables with rubber of about 11.3mm. During the use and maintenance, it is strictly forbidden to power on, open the cover for maintenance and pry the explosion-proof surface in explosive places. At the same time, do not knock or scratch the flameproof surface during disassembly and assembly, and return to the original flameproof required state after maintenance

(7) pay attention to oil lubrication after the disassembly and repair of the reducer of the actuator. Generally, do not disassemble, wash and add oil for the low-speed motor. After assembly, check whether the valve position is consistent with the valve position opening indication

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