Pneumatic diaphragm control valves, when paired with electro-pneumatic valve positioners or pneumatic valve positioners, enable automatic regulation and control of fluid media within process pipelines. Compact pneumatic diaphragm control valves are widely used for precise regulation of process parameters—such as pressure, flow rate, temperature, and liquid level—in gases, liquids, and steam, maintaining them at specified values. These valves are particularly suitable for applications requiring low leakage rates, moderate pressure differentials across the valve, and handling media with moderate viscosity or containing minor fibrous content.
| Nominal Diameter(DN) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seat diameter(dn) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | |
| Rated Flow Coefficient(KV) | Single-seat | 6.9 | 11 | 17.6 | 27.5 | 44 | 69 | 110 | 176 | 275 | 440 | 630 | 875 | 1250 |
| Sleeve | 6.3 | 10 | 16 | 25 | 40 | 63 | 100 | 160 | 250 | 360 | 570 | 850 | 1180 | |
| Permissible pressure differential(MPa) | Single-seat | 3.8 | 3.2 | 3.0 | 2.0 | 1.8 | 1.5 | 1.4 | 1.0 | 0,7 | 0.6 | 0.5 | 0.3 | 0.1 |
| Sleeve | 6.4 | 6.4 | 5.2 | 5.2 | 4.6 | 4.6 | 3.7 | 3.7 | 3.5 | 3.1 | 3.1 | 2.6 | 2.2 | |
| Nominal Pressure(MPa) | 1.6, 2.5, 4.0, 6.4, 10.0 | |||||||||||||
| Rated stroke(mm) | 16 | 25 | 40 | 60 | 100 | |||||||||
| Actuator Model | ZHA/B-22 | ZHA/B-23 | ZHA/B-34 | ZHA/B-45 | ZHA/B-56 | |||||||||
| Valve bonnet type | Standard Type (-17 to +250°C), High-Temperature Type (+250 to +450°C), Low-Temperature Type (-40 to -196°C), Bellows-Sealed Type (-40 to +350°C) | |||||||||||||
| Cap Form | Bolt-clamping type | |||||||||||||
| Sealing Packing | V-shaped PTFE packing, V-shaped flexible graphite packing | |||||||||||||
| Valve Core Type | Single-seat type, sleeve type | |||||||||||||
| Flow Characteristics | Equal percentage, linearity | |||||||||||||
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