Pneumatic control valve selection guide

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ZXP pneumatic single-seat control valve, ZXN pneumatic double-seat control valve, ZXM pneumatic sleeve control valve; electronic versions of the ZXP pneumatic single-seat control valve and ZXM pneumatic sleeve/three-way control valves: http://www.fspv.com/imge/tjf013.jpg. Overview: The ZXP pneumatic single-seat control valve, ZXN pneumatic double-seat control valve, and ZXM pneumatic sleeve control valve – these series of pneumatic diaphragm straight-through control valves feature a top-guided structure and are equipped with multi-spring actuators. It features a compact structure, light weight, rapid response, an S-shaped streamlined filling channel, low pressure drop loss, large valve capacity, precise flow characteristics, and easy installation and disassembly. It is widely used for precise control of media such as gases and liquids, ensuring that process parameters like pressure, flow rate, temperature, and liquid level remain at specified values. The single-seat type is suitable for applications where strict control over leakage is required, the pressure difference before and after the valve is low, and the medium has a certain viscosity or contains fibers ； Dual-seat valves feature low unbalanced force, a large allowable pressure difference, and high flow capacity, making them suitable for applications where strict leakage requirements do not apply ； Sleeve valves feature good stability, are less prone to vibration, produce low noise, are less sensitive to temperature, and are suitable for applications with large pressure differences where strict leakage requirements do not apply. This series of products is available in various types, including the standard type, adjustable cut-off type, bellows-sealed type, and jacket-insulated type. The nominal pressure grades of the product are PN10, 16, 40, 64 ； The valve body diameter range is DN20~400. The applicable fluid temperatures range across multiple grades from -200°C to 560°C. The leakage standard is Grade IV or Grade VI. The flow characteristic is linear or equal percentage. A variety of styles and specifications are available for selection. Main technical parameters and performance indicators
Main technical parameters of the actuating mechanism
Nominal diameter, mm: 20, 25, 40, 50, 65, 80, 100, 150, 200, 250, 300, 350, 400
Seat diameter, mm: 10, 12, 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300
Production can be arranged in consultation with our company.
Rated flow rate
Coefficient Kv: Linear – 1.8, 2.8, 4.4, 6.9, 11, 17.6; Equal percentage – 1.6, 2.5, 4.6, 3.1, 10, 16, 25, 40, 63; Quick opening type
Medium temperature range, °C: -15 to 200 (normal temperature type), -40 to +250, -40 to +450 (medium temperature type), -100 to +200 (low temperature type)
Flange dimensions: Cast iron flanges follow JB78 standards, while steel flanges follow JB79 standards.
Flange form and seal surface type are specified according to JB77; cast iron flanges have a smooth surface, while steel flanges have a recessed surface.
Valve body material, PN (MPa): 0.6, 1.6 – HT200, WCB (ZG230-450); 4.0, 6.4 – WCB (ZG230-450), ZG1Cr18Ni9Ti, ZG0Cr18Ni12Mo2Ti
Spool material: 1Cr18Ni9, 0Cr18Ni12Mo2Ti
Upper valve cover type: Ordinary type (normal temperature type), heat-exchange type (medium temperature type), low temperature type
Adjustable ratio: R50:1
Air supply connector: M16×1.5
Note: Products with ANSI or JIS flanges can be provided for customers, and the structural length can also be determined according to customer requirements. Main technical parameters of the actuator:
Model: ZHA-22, ZHB-22, ZHA-23, ZHB-23, ZHB-34, ZHB-34, ZHA-45, ZHB-45, ZHA-56, ZHB-56
Effective area (cm²): 350, 350, 560, 900, 1600
Stroke (mm): 16, 25, 40, 60, 100
Spring range (KPa): 20–100 (standard); 40–200; 80–240; 20–60; 60–100

Performance indicators:
| Parameter | Value |
|-----------|-------|
| Basic error % | Without positioner: ±5.0 |
| Deviation at the start point % | Air-operated, without positioner: ±5.0; With positioner: ±1.0; At the end point: ±2.5 |
| Hysteresis % | Without positioner: ≤3.0; With positioner: At the start point: ±1.0; At the end point: ±1.0; With positioner: ≤1.0 |
| Air-operated, without positioner | At the start point: ±2.5; At the end point: ±5.0 |
| Dead zone % | Without positioner: ≤3.0; With positioner: At the start point: ±1.0; At the end point: ±1.0; With positioner: ≤0.4 |
| Allowable leakage rate (L/h): 1×10^-4 × rated capacity of the valve |
| Rated stroke deviation %: ±2.5 |

Note: This product complies with the GB/T4213-92 standard. Allowable pressure difference MPa, actuator type, spring range KPa, air supply pressure KPa, required accessories, nominal diameter (valve seat diameter) mm: 25, 25, 40, 50, 65, 80, 100, 150, 200, 250, 300. (10), (12), (15), (20), (32), (40), (125), (150). Air-operated: ZHA -2: 20–100, 20–100, 40–200; 140, 250; 140P or R6.4, 6.4, 6.4; 5.94, 6.4, 6.4; 3.34, 6.4, 6.4; 3.34, 6.4, 6.4; 2.14, 6.4. ZHA -23: 20–100, 20–100, 40–200; 140, 250, 400P or R; 1.31, 6.09, 6.4; 0.84, 3.9, 5.2; 60.53, 2.5, 3.39. ZHA -3: 420–100, 20–100, 40–200; 140, 250, 400P or R; 0.51, 2.36, 3.2; 10.33, 1.56, 2.12; 0.21, 1.0, 1.35. ZHA -4: 520–100, 20–100, 40–200; 140, 250, 400P or R; 0.22, 1.02, 1.39; 0.15, 0.71, 0.97; 0.08, 0.40, 0.54. ZHA -5: 620–100, 20–100, 40–200; 140, 250, 400P or R; 0.10, 0.38, 0.52; 0.07, 0.26, 0.36. Air-operated: ZHB -2: 20–100, 40–200, 80–240; 140, 250, 400P or R; 4.46, 6.4, 6.4; 3.09, 6.4, 6.4; 1.98, 5.94, 6.4; 1.11, 3.34, 6.4; 0.71, 2.14, 4.99. ZHB -23: 20–100, 40–200, 80–240; 140, 250, 400P or R; 0.44, 1.37, 3.05; 0.28, 0.84, 1.95; 0.18, 0.53, 1.25. ZHB -3: 420–100, 40–200, 80–240; 140, 250, 400P or R; 0.17, 0.51, 1.18; 0.11, 0.33, 0.78; 0.07, 0.21, 0.5. ZHB -4: 520–100, 40–200, 80–240; 140, 250, 400P or R; 0.07, 0.22, 0.51; 0.05, 0.15, 0.35; 0.028, 0.08, 0.20. ZHA -5: 620–100, 20–100, 40–200; 140, 250, 400P or R; 0.10, 0.15, 0.20; 0.07, 0.10, 0.14. Note: 1) P – valve positioner; R – pressure relay. 2) The allowable pressure difference is the maximum value of P when the valve is closed at P2 = 0. 3) If the allowable pressure difference is unknown or the maximum operating pressure difference exceeds the range listed, please contact us. Optional accessories: positioner, air filter regulator, retaining valve, limit switch, valve position transmitter, solenoid valve, handwheel mechanism, etc. Dimensions in mm: DNLHH1; Weight in kg: φAPN16PN40PN64 – normal high temperature; PN6PN16PN40PN64PN6; PN16PN40PN64: 2018119420639854845526519232852518519721041056050577020244022223525145562065758526355025426728645762770829030406527629231161079080921004766360802983173376228079510010755781003523683946408501051101171256599150451473508870113013214215017213016047020060065089011501601701872071752502507307751203152318720222523535047058030085090012341554220230257265500660. http://www.fspv.com/imge/zjhpcad.jpg. Pneumatic diaphragm control valve. Materials of main components: Component name – Material – Temperature range. Valve body, upper valve cover: HT200 – 20～200℃; ZG230 – 450 – 40～450℃; ZG1Cr18Ni9Ti – 250～550℃; ZG0Cr18Ni12Mo2Ti – 250～550℃. Valve core, valve seat: 1Cr18Ni9 – 250～550℃; 0Cr18Ni12Mo2Ti – 250～550℃. Packing: Polytetrafluoroethylene – 40～200℃. Diaphragm: Nitrile rubber with reinforced polyester fabric. Compression spring: 60Si2Mn. Diaphragm cover: A3. Ordering instructions: When placing an order, please fill out the “Specification Sheet” or indicate the following information: 1. If the model has not been selected yet, please provide us with your application parameters: 1. Nominal diameter, rated flow coefficient KV; 2. Properties of the fluid (including nominal pressure, temperature, viscosity, or acidity/alkalinity); 3. Signal pressure, spring range; 4. Flow characteristics; 5. Type of valve operation; 6. Materials for the valve body and valve core; 7. Whether accessories are required, along with the model numbers of those accessories. So that we can select the right model for you. II. If the design unit has already selected our company’s product model, please place an order directly with our sales department using that model ； III. When the application scenario is very important or the piping system is complex, please provide design drawings and detailed parameters as much as possible, so that our experts can review them for you