The ZHJPX pneumatic small flow control valve is a precision execution unit specifically designed for the accurate control of micro-flow rates (on the scale of microliters or milliliters). It consists of a multi-spring pneumatic diaphragm actuator and a compact single-seated valve body. The core design features high-precision plug-and-seat sets (micro-flow trim), enabling proportional regulation for media with extremely low flow coefficients (Cv values). By receiving standard analog signals from control systems, the actuator utilizes compressed air to drive the stem for minute displacement, altering the throttling area in real-time. Due to its exceptional regulation resolution and sensitivity, the ZHJPX series is widely used in laboratory research, dosing systems, fine chemical proportioning, semiconductor manufacturing, and any process requiring extremely fine adjustment of fluid parameters.

Product Image of ZHJPX Pneumatic Small-Flow Control Valve

1.Precise micro-flow regulation:Offers various micro-trim designs with minimum flow coefficients down to the milli-level. Precision-ground needle-type plugs paired with specialized seats ensure excellent equal percentage or linear characteristics under extremely low flow conditions.
2.High-sensitivity drive and positioning:Equipped with a compact multi-spring pneumatic actuator featuring rapid response and minimal dead zones. Paired with a high-precision positioner, it achieves micron-level stroke positioning for dynamic stability.
3.Superior sealing and durability:To address erosion issues common in small flow valves, plugs and seats are made of hardened stainless steel or hard-faced with Stellite, offering excellent erosion resistance. The single-seat structure ensures bubble-tight shut-off.
4.Diverse materials and high cleanliness:Body materials include premium stainless steels like 304 and 316L. Fine polishing of internal walls ensures smooth flow without dead ends, preventing residue and particle accumulation for high-purity fluid control.
5.Intrinsically safe attributes:Powered by compressed air, providing natural explosion protection for hazardous areas. Supports fail-open or fail-close configurations to ensure system safety during air supply failure.
6.Lightweight and compact design:Minimal dimensions significantly reduce installation height and weight in lab cabinets or dense networks. The scientific yoke design facilitates the integration of positioners and accessories.
7.Pressure and temperature stability:The high-strength body ensures no mechanical deformation under high pressure drops. The precision sealing system offsets thermal expansion impacts on micro-regulation accuracy.
8.Convenient modular maintenance:The streamlined design features minimal wearing parts. Due to the high integration of micro-internals, rapid online inspection and replacement of the plug assembly can be performed without removing the valve from the line.

Structural Drawing of ZHJPX Pneumatic Small-Flow Control Valve

List of Component Names and Materials

Performance Specification Shee

Standard requirements for external dimensions

1. The structural length of the valve shall comply with the standard of GB/T12221

2. Connecting flanges according to GB/T17241.6 standard

Outline dimension table（Unit：mm）

Due to the rapid R&D iteration speed of valve products from China Kaivex Valve Group Co., Ltd., the above technical parameters and specification documents, including product overview, features, parts materials, outline dimension charts, CAD drawings, and product instruction manuals, are for your reference only. For actual applications, please contact our valve sales engineers to obtain the support you need for free. Thank you!