1. Electric two-way control valve installation precautions Newly designed and installed control system, in order to ensure the electric thermostat valve can work properly 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? The following items should also be debugged. Basic error limit; full stroke deviation; backlash; dead zone; leakage (in demanding occasions). If it is the original system of electric two-way control 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. Electric two-way valve in the field of use, often not because of the quality of the control valve itself caused, but the installation of electric two-way valve caused by improper use, such as the installation of the environment, the installation location and direction of improper or pipeline is not Cleaning and other reasons. Therefore, the electric two-way control valve should pay attention to the following aspects when installing and using: (1) The electric two-way control valve belongs to the field instrument, the ambient temperature should be -25 ~ 60 ℃ and the 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 electric two-way control valve should be installed vertically. In special circumstances, it can be tilted. For example, when the tilt angle is very big or the valve itself is too heavy, support for the valve should be increased. (3) Installation of electric two-way control valve pipe generally not 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) electric two-way control valve should be installed before the pipeline cleaning, 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 electric two-way control valve in case of failure or maintenance of the production process can continue, electric two-way control valve should be bypassed. At the same time should also pay special attention to the installation position of the electric two-way control valve meets the requirements of the process. (6) The installation of the electric part of the electric two-way regulating valve shall be based on the construction requirements of the relevant electrical equipment. 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. 2. Electric two-way control valve parts and the reasons for the common fault Electric two-way valve performance will directly affect the quality of the entire regulatory system. As the regulating valve in the field is in direct contact with the medium to be adjusted, the working environment is very poor, so easy to produce a variety of failures. In the production process, in addition to ruled out these failures at any time, but also must be regular maintenance and regular maintenance. Especially for the use of particularly harsh environment control valve, but should pay attention to maintenance and regular maintenance.
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