ZJHT pneumatic diaphragm actuated diaphragm control valve is a precision fluid control unit utilizing a flexible membrane as both the closing and sealing element. It integrates a multi-spring pneumatic diaphragm actuator with a streamlined diaphragm valve body featuring a smooth, dead-zone-free flow path. By receiving standard 4-20mA DC signals from control systems, it uses compressed air to actuate the stem, pressing the elastic diaphragm against the weir to regulate or shut off flow. Because this unique design completely isolates the medium from the stem and actuator, the valve offers exceptional corrosion resistance and superior cleanliness. The ZJHT series is widely applied in petrochemical, pharmaceutical, food, environmental, and ultrapure water industries, particularly for handling aggressive chemicals, high-viscosity slurries, and hygienic process media.

Product Image of ZJHT Pneumatic Diaphragm Actuated Diaphragm Control Valve

Features

1. Superior corrosion resistance:The body cavity can be fully lined with various fluoroplastics (e.g., PFA, FEP) or high-performance elastomers. Combined with a corrosion-resistant synthetic diaphragm, it withstands almost all strong acids, alkalis, and oxidants.
2.Zero-leakage sealing performance:The flexible diaphragm serves as the primary seal, eliminating the need for traditional stem packing. It creates an absolute barrier between the medium and the atmosphere, ensuring bubble-tight shut-off and preventing external stem leakage.
3.Optimized hydrodynamic design:The flow path is smooth, wide, and free of stagnation areas. This minimizes flow resistance and prevents the accumulation of scale or residue, making it ideal for viscous fluids, fibrous pulps, and media with suspended solids.
4.Precision pneumatic drive system:Equipped with a multi-spring pneumatic diaphragm actuator, providing high thrust and stable operation. Paired with an electro-pneumatic positioner, it enables sensitive proportional regulation across the full stroke.
5.Intrinsically safe attributes:Driven by clean compressed air without electrical spark risks, providing natural explosion-proof safety. Available in air-to-open or air-to-close modes for fail-safe positioning during air supply failure.
6.Simple structure and easy maintenance:Consisting of only three major components—body, diaphragm, and actuator. The diaphragm is the only wearing part, and its replacement is straightforward without removing the valve from the pipeline, reducing maintenance costs.
7.Compliance with hygienic standards:The smooth internal surfaces facilitate CIP (Clean-in-Place) or SIP (Steam-in-Place) processes, preventing bacterial growth and meeting the strict hygiene standards of the pharmaceutical and food industries.
8.Excellent anti-cavitation performance:The specific flow path geometry ensures a gradual pressure recovery during throttling, effectively mitigating cavitation damage under high pressure drops and extending service life.