Electric proportional small flow regulating valve

 The flow characteristics of the electric control valve is the relationship between the relative flow rate of the medium flowing through the electric control valve and its opening degree under the condition that the pressure difference between the two ends of the valve remains constant.

 The flow characteristics of electric control valve are: linear characteristics, equal percentage characteristics and parabolic characteristics of three kinds.
VII. Installation precautions:

 New design, installation of electric control valve control system, in order to ensure that the control valve can work normally when driving, and make the system safe operation, the new valve before installation, should 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; full stroke deviation; backlash; dead band; leakage (in strict cases). If the control valve in the original system has been overhauled, in addition to the calibration of the above items, the sealing inspection of the stuffing box and connection of the old valve should also be carried out. In field use, many are often not caused by the quality of the control valve itself, but by improper installation and use of the control valve, such as improper installation environment, installation position and direction, or because the pipeline is not clean. Therefore, the electric control valve in the installation and use to pay attention to the following aspects:
 1, the regulating valve belongs to the field instrument, the environmental temperature should be in the range of-25 to 60 ℃, relative humidity≤ 95%. If it is installed in the open air or high temperature, waterproof and cooling measures should be taken. Keep away from vibration sources or increase anti-vibration measures where there are seismic sources.
 2, the control valve should generally be installed vertically, under special circumstances can be tilted, such as tilt angle is very large or the valve itself is too heavy when the valve should increase the support protection.
 3, the installation of regulating valve pipes generally do not leave the ground or floor too high, in the pipeline height is greater than 2 m should try to set the platform, in order to facilitate the operation of the handwheel and easy maintenance.
 4. Clean the pipeline before installing the regulating valve to eliminate 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, so as not to get stuck with impurities. After using the handwheel mechanism, return 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 added bypass 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 installation should be carried out according to the requirements of the relevant electrical equipment construction. If the explosion-proof products should be installed in accordance with the requirements of the Code for Installation of Electrical Equipment in Explosive Hazardous Places. If SBH type or other six-core or eight-core wires are used in the field, the outer diameter is?? 11.3 mm rubber mounting cable. In use and maintenance, it is strictly prohibited to open the cover for maintenance and pry the flameproof surface in explosive places. At the same time, do not knock or scratch the flameproof surface during disassembly, and restore to the original flameproof requirement state after maintenance.
 7, the actuator reducer after repair should pay attention to refueling lubrication, low-speed motor generally do not disassemble oil. After assembly, check whether the valve position is consistent with the valve position opening indication.

 Hangzhou Liangsheng Electric Co., Ltd.(Hangzhou Lianggong Valve Co., Ltd.) produces electronic electric control valve, pneumatic diaphragm control valve, self-operated pressure control valve, nitrogen sealing device nitrogen sealing valve, self-operated steam pressure relief valve, pneumatic cut-off ball valve, pneumatic butterfly valve, etc.