Knowledge Hall: Precautions for the installation of electric control valve

With the rapid development of our country's industry, the application of electric control valve in metallurgy, petrochemical and other fields is becoming more and more widespread. Its stability and reliability are also becoming more and more important. Its working status will directly affect the automatic control process. Electric control valve installation and use of Notes: 1, the newly designed and installed control system, in order to ensure that the control valve can work properly while driving, and make the system safe operation, the new valve before installation, you should first check the nameplate tag on the valve Is it consistent with the design requirements? 2, but also the following items should be debugged. Basic error limit; full stroke deviation; backlash; dead zone; leakage (in demanding occasions). 3, if it is the original system of regulating valve overhaul, in addition to the above-mentioned verification, but also the old valve should be stuffing box and connections and other parts of a tightness check. 4, the control valve in the field of use, often not because of the quality of the control valve itself caused, but the use of regulating valve installed improperly caused, such as the installation of the environment, the installation location and direction of improper or unclean pipe and other reasons To Therefore, the installation of electric control valve should pay attention to the following aspects: (1) The regulating valve is a field instrument, the ambient temperature should be -25 ~ 60 ℃, relative humidity ≤ 95%. If it is installed in open air or high temperature occasions, should take waterproof, cooling measures. In the place with the source to stay away from the vibration source or increase the anti-vibration measures. (2) The control valve should generally be installed vertically, under special circumstances can be tilted, such as a large tilt angle or the valve itself is too heavy when the valve should be increased support protection. (3) Generally, do not install the control valve pipe from the ground or the floor is too high, the pipe height is greater than 2m should be set as the platform, in order to facilitate the operation of the hand wheel and easy maintenance. (4) The control valve should be installed before cleaning the pipeline to remove dirt and welding slag. After installation, in order to ensure that no impurities remain in the valve body, the valve should also be cleaned again, that is, the medium should be opened so that all valves open to prevent impurities stuck. After using the hand wheel mechanism should be restored to the original neutral position. (5) In order to make the control valve in the event of failure or maintenance of the production process can continue, the control valve should be bypassed. At the same time should also pay special attention to the installation position of the valve is in line with the process requirements. (6) The electric part of the electric control valve should be installed according to the requirements of the electrical equipment construction. In the case of explosion-proof products, they should be installed in accordance with the "Installation Specification for Electrical Equipment in Explosion Hazardous Locations". Such as the scene wire SBH or other six-core or eight core, outer diameter of about Φ11.3mm rubber mounting cable. In the use of maintenance, in the explosive place is strictly prohibited open cover repair and blasting face pry. At the same time do not knock in the disassembly or scratch explosion-proof surface, after repair to restore the original flameproof state. (7) After the actuator reducer repair should pay attention to refueling lubrication, low-speed motor generally do not demolition and refueling. Assembly should also check the valve position and valve position opening instructions are consistent. This article Keywords: regulating valve