The ZJHP and ZJHM compact pneumatic diaphragm single-port and sleeve regulating valves adopt a top-guided structure and are equipped with multi-spring actuators. They feature a compact design, light weight, sensitive response, S-streamlined fluid passage for minimal pressure drop loss, high valve capacity, precise flow characteristics, and easy disassembly and assembly. They are widely used for precise control of process parameters such as pressure, flow, temperature, and liquid level for gases, liquids, and other media to maintain set values. They are particularly suitable for applications requiring small allowable leakage and low pressure differential across the valve. This product series includes standard, regulating/shut-off, bellows seal, and jacketed insulation types. Pressure ratings include PN16 and PN40/64. Nominal diameter ranges from DN20 to DN300. Applicable fluid temperatures cover multiple ranges from -200°C to +560°C. Leakage standards include Class IV or VI. Flow characteristics are linear or equal percentage. A wide variety of models and specifications are available for selection.