Pneumatic valve positioner installation instructions

Pneumatic valve positioner is used to adjust flow in the pneumatic pneumatic valves necessary one of the most important accessories, which is equipped with pneumatic actuators, by receiving 4 - in the controller or control system 20 ma related signal to control the size of the pneumatic valve opening, so as to achieve precise control pipe of various process parameters. Pneumatic valve positioner and actuator of form a complete set, with all kinds of automatic control unit or the connection of the pneumatic valve, after debugging installation, combined into pneumatic regulating pneumatic valve, pneumatic valve used in all kinds of industrial automation process control field. According to the structure in general can be divided into pneumatic valve positioner pneumatic pneumatic valve positioner, electric pneumatic valve positioner and intelligent pneumatic valve positioner.

【 Pneumatic valve positioner installation process 】


1, generally the height of the actuator shaft ( H) Can be divided into three,30,50 20 mm. After confirm the height of the actuator shaft, according to the pictures below show, assembly bracket.





2, the stent with hexagonal head bolt is connected to the bracket of the actuator. Connected to the bracket on the aperture of the actuator is 6 mm, so have to choose the appropriate screw. And in order to prevent vibration factors such as screw be lax, please use the spring washer, or other installation methods. Bracket installation direction according to the conditions of use is different, but generally suggest direction, referring to the following figure both piping and pneumatic actuator valve positioner direction installation of piping in the same direction.





3, the actuator shaft rotary position on the starting position, or 0% of the opening position. When the single-acting cylinder of the spring actuator is used, if not the input air pressure, the cylinder axis always return to the starting point, so it's easy to confirm. When double-acting cylinder, refer to cylinder specifications, confirm it is clockwise or counterclockwise, or input air compressor cylinder axis direction of rotation.




4, now the fork lever up and tighten the fork lever clockwise the retaining screw. The pneumatic valve positioner is installed on the bracket. Pneumatic valve positioner is placed above the bracket, the spindle under the fixed pin alignment fork lever at the top of the center hole, at the same time the spindle feedback pole connecting rods inserted into the fork slots. This is to let the pneumatic valve positioner of the spindle and the center of the cylinder axis is consistent, if there is no alignment center, then place on the main shaft of the pneumatic valve positioner load force, influence within the structure of products, so please correct alignment center.





5, pneumatic valve positioner with hex bolts and washers and stent. Please do not fully tighten the bolts in turn when the retaining bolt, and the four bolts twist to a certain degree, after confirm the correct position of the pneumatic valve positioner in tighten the four bolts.



pneumatic valve positioner can increase to adjust the output power of the pneumatic valve, reduce the control signal transmission lag, accelerate the pneumatic valve rod movement speed, to improve the linearity of the pneumatic valve, overcome the friction of the pneumatic valve stem and eliminate the influence of unbalanced force, so as to ensure the correct positioning of regulating pneumatic valve.

related knowledge: pneumatic valve positioner classification and principle of the pneumatic valve positioner dynamic figure