Introduction to Pneumatic Control Valve

The KLP series pneumatic quick installation single seat regulating valve adopts a top guided unbalanced structure, with high strength, heavy load, S-shaped streamlined channel, low pressure drop loss, large flow coefficient, wide adjustable range, and high precision of flow characteristics. This regulating valve is suitable for heavy loads, normal or harsh working conditions, with tight closure, suitable for controlling fluids or gases of various pressures and temperatures, and adaptable to various actuators, playing a regulating role. The quick installation valve cage compression valve seat design reduces lateral load and valve core vibration, reduces friction, and extends the service life of the control valve. Flow open design, the flow direction of the medium tends towards the direction of the control valve opening, and the controllability of small flow states is good. According to the working conditions, special valve cages that reduce noise and resist cavitation can be selected

※ Product specifications for pneumatic control valves

Main parameters of pneumatic control valve body

※ Pneumatic control valve structure length (flange distance)

※Rated flow coefficient and stroke of pneumatic control valve

For valve seat diameters below 20mm, please refer to the Small Flow Valve Manual

※ Installation 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 items 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 the use of regulating valves, many of them are often not caused 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, attention should be paid to the following aspects when installing and using regulating valves:

(1) The regulating valve is a field instrument, and it is required that the ambient temperature should be within the range of -25 to 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.

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

(3) The pipeline for installing regulating valves 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.

(4) Before installing the regulating 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.

(5) 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, and special attention should be paid to whether the installation position of the regulating valve meets the requirements of the process.

(6) The installation of the electrical part of the regulating 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". During use and maintenance, it is strictly prohibited to use electricity to open the cover for repair and to strike 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.

(7) After disassembling and repairing 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.

morepneumatic control valvePlease click here for installation instructions