Pneumatic diaphragm single-seat control valves, equipped with valve positioners, convert electrical signals into corresponding linear displacement to automatically regulate valve opening. This enables continuous adjustment of process parameters such as pressure, flow rate, temperature, and liquid level within pipelines. Pneumatic diaphragm single-seat control valves are widely used for precise control of gases, liquids, steam, and other media. They are particularly suitable for applications with small allowable pressure differentials and minimal leakage requirements.
These valves offer stable operation with reliable performance characteristics, including minimal seat leakage, accurate flow characteristics, and a wide adjustable range. Their superior advantages ensure high-quality control outcomes across diverse applications.
Pneumatic Diaphragm Single-Seat Control Valve Technical Specifications
| Nominal Diameter(DN) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 |
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| Seat diameter(dn) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 |
| Rated Flow Coefficient(KV) | Straight line | 6.9 | 11 | 17.6 | 27.5 | 44 | 69 | 110 | 176 | 275 | 440 | 630 | 875 | 1250 |
| Equal parts | 6.3 | 10 | 16 | 25 | 40 | 63 | 100 | 160 | 250 | 360 | 570 | 850 | 1180 |
| Permissible pressure differential(MPa) | 3.2 | 3.0 | 2.0 | 1.8 | 1.5 | 1.4 | 1.0 | 0,7 | 0.6 | 0.5 | 0.3 | 0.2 | 0.1 |
| 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 plunger-type valve core |
| Flow Characteristics | Linearity, equal percentage |
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