The ZPQ pneumatic valve positioner is a critical accessory for pneumatic actuators in industrial process control systems. The device receives a pneumatic command signal of 20-100kPa (or other standard ranges) from a pneumatic controller. Utilizing the force-balance principle, it converts the input signal into a corresponding output pressure for the actuator. Through mechanical displacement feedback from the valve stem, the positioner corrects valve position deviations in real-time to achieve precise positioning. Since the unit relies entirely on pneumatic components without any electrical signals, the ZPQ positioner possesses exceptional intrinsic safety, making it ideal for flammable and explosive environments in petroleum, chemical, and natural gas industries where sparks must be strictly prohibited.

Product Image of ZPQ Pneumatic Valve Positioner

1.Intrinsically safe pure pneumatic logic:Uses compressed air as both signal transmission and power medium without electronic components. It offers natural explosion-proof attributes, allowing stable operation in high-risk zones without the need for specialized enclosures.
2.High sensitivity and positioning accuracy:Features a high-precision nozzle-flapper mechanism and force-balance system. It captures minute air pressure fluctuations and converts them into thrust compensation to overcome stem friction and unbalanced forces.
3.Full-stroke proportional regulation:Provides excellent linearity where output pressure is strictly proportional to the input signal. Combined with various feedback cams, it supports linear or equal-percentage characteristic conversions.
4.Low steady-state air consumption:The pilot valve structure is hydrodynamically optimized to ensure minimal air consumption once the valve reaches a balanced position, reducing overall power loss in the compressed air system.
5.Robust industrial protection:The housing is made of die-cast aluminum alloy with anti-corrosion coating. The structure is rugged and vibration-resistant, adapting to outdoor, humid, and corrosive industrial environments.
6.Convenient zero and span adjustment:Equipped with intuitive adjustment screws and span blocks. Users can quickly perform calibration and fine-tuning of 0% and 100% stroke without specialized tools.
7.Wide actuator compatibility:Complies with international industrial mounting standards. It can be easily installed on various specifications of pneumatic diaphragm actuators (single-acting) or pneumatic piston actuators (double-acting).
8.Modular structure for easy maintenance:Clear internal air circuit layout with high component interchangeability. Routine inspections or filter cleaning operations are straightforward, ensuring low maintenance costs.

Structural Drawing of ZPQ Pneumatic Valve Positioner

Main Technical Parameters