VFM2 Danfoss two-way regulating valve

VFM2 Danfoss electric control valveInstallation and usage precautions:

In order to ensure the normal operation of the regulating valve during start-up and ensure the safe operation of the system for the newly designed and installed control system, the nameplate markings on the valve should be checked for compliance with the design requirements before installation. At the same time, the following projects should also be debugged.

Basic error limit; Full journey deviation; Return difference; Dead zone; Leakage rate (when strictly required).

If the control valve in the original system is overhauled, in addition to the calibration of the above items, the sealing inspection shall also be carried out on the stuffing box and connection of the old valve.

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

⑴ The regulating valve is a field instrument, and it is required that the ambient temperature should be within the range of -25~60 ℃ and the relative humidity should be ≤ 95%. If installed outdoors or in high-temperature environments, waterproof and cooling measures should be taken. In areas with seismic sources, it is necessary to stay away from the source or increase anti vibration measures.

⑵ Regulating valves should generally be installed vertically, and in special cases, they can be tilted. If the tilt angle is too large or the valve itself weighs too much, supporting components should be added to protect the valve.

The pipeline for installing the regulating valve should generally not be too high above the ground or floor. When the pipeline height is greater than 2 meters, a platform should be set up as much as possible to facilitate the operation of the handwheel and maintenance.

Before installing the VFM2 Danfoss electric control 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 valves should be cleaned again. That is, when introducing the medium, all valves should be opened to prevent impurities from getting stuck. After using the handwheel mechanism, it should be restored to its original neutral position.

In order to enable the production process to continue in case of malfunction or maintenance of the regulating valve, a bypass pipeline should be added to the regulating valve.

Special attention should also be paid to whether the installation position of the regulating valve meets the requirements of the process.

The electrical installation of the VFM2 Danfoss electric control valve should be carried out according to the relevant electrical equipment construction requirements. If it is a flameproof product, it should be installed according to the requirements of the "Installation Specification for Electrical Equipment in Explosive Hazardous Areas". What is the outer diameter of the on-site wire using SBH type or other six core or eight core?? Install cable wires with rubber around 11.3mm. During use and maintenance, it is strictly prohibited to open the cover and pry open the explosion-proof surface in explosive areas. At the same time, do not damage or scratch the explosion-proof surface during disassembly and assembly, and restore it to its original explosion-proof state after maintenance.

After disassembling and repairing the reducer of the actuator, attention should be paid to oiling and lubrication. Generally, low-speed motors should not be disassembled, washed, or oiled. After assembly, it is also necessary to check whether the valve position matches the valve opening indication.