KAX series pneumatic three-way control valves, pneumatic three-way control valves, three-way valves, using double spool up and down guide structure, usually used in heat exchangers, according to the use can be divided into shunt control type (one in two out), confluence control type (two in one out), fast cut-off type.

Installation Notes

The newly designed and installed control system, in order to ensure the normal operation of the control valve while driving and ensure the safe operation of the system, the new valve should first check whether the nameplate marks on the valve are in conformity with the design requirements before installation. At the same time, the following items should be debugged: the basic error limit; the whole journey deviation; backlash; dead zone; leakage (in strict occasions).

   If the control valve in the original system is overhauled, besides checking the above items, the sealing inspection of the filling box and the connecting parts of the old valve should also be carried out.

      In the use of control valves, many are not caused by the quality of the control valve itself, but by improper installation and use of the control valve, such as the installation environment, installation location and direction of improper or unclean pipelines and other reasons. Therefore, when installing and using the control valve, the following aspects should be paid attention to:

      (1) Regulating valves belong to field instruments, requiring the ambient temperature to be in the range of -25-60 C and the relative humidity to be less than 95%. If it is installed in open air or high temperature situation, waterproof and cooling measures should be taken. Where there is a seismic source, it is necessary to stay away from the source or to increase measures to prevent vibration.

      (2) Regulating valves should be installed vertically in general, and can be tilted in special cases. For example, when the angle of tilt is large or the weight of the valve itself is too large, support protection should be added to the valve.

      (3) Pipelines installed with control valves should not be too high from the ground or floor. Platform should be set up as far as possible when the pipe height is greater than 2m to facilitate the operation of handwheels and maintenance.

      (4) Pipeline should be cleaned before installation of control valve to remove dirt and welding slag. After installation, in order to ensure that impurities do not remain in the body of the valve, the valve should be cleaned again, that is, all valves should be opened when entering the medium, so as to avoid impurities blocking. After using the handwheel mechanism, the original neutral position should be restored.

      (5) In order to enable the production process to continue in the case of failure or maintenance of the control valve, the control valve should bypass the pipeline. At the same time, special attention should be paid to whether the installation position of the control valve meets the requirements of the process.

      (6) The installation of the electric part of the control valve shall be carried out according to the construction requirements of the relevant electrical equipment. If it is flameproof products, they should be installed in accordance with the requirements of "Installation Specification for Electrical Equipment in Explosive Hazardous Places". In use and maintenance, it is strictly forbidden to open the cover with electricity and knock on the flameproof surface in explosive sites. At the same time, do not knock or scratch the flameproof surface in disassembly and assembly, after maintenance, it should be restored to the original flameproof requirement state.

     (7) Care should be taken to refuel and lubricate the actuator after disassembly and repair, and low-speed Motors should not be disassembled and washed for refueling. After assembly, check whether the valve position is in accordance with the indication of valve opening.