Pneumatic diaphragm double-seat control valves are widely used for precisely regulating process parameters such as pressure, flow rate, temperature, and liquid level of media including gases, liquids, and steam to maintain them at specified values. These valves are particularly suitable for applications involving large pressure differentials, higher permissible leakage rates, and non-clean media. Pneumatic double-seat control valves are extensively employed in industrial control sectors including petroleum, chemical, pharmaceutical, metallurgical, and power plants, primarily regulating gases, liquids, and steam.
This series offers multiple variants: standard, high-temperature, bellows-sealed, and jacketed insulation types. Product nominal pressure ratings include PN16, 40, and 64; valve body sizes range from DN25 to DN400. Applicable fluid temperatures span multiple grades within the range of -250°C to +560°C. Leakage standards comply with Class III and Class IV. Flow characteristics are available as linear or percentage. A diverse selection of models and specifications is offered.
Pneumatic Diaphragm Double-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 | 10 | 12.5 | 19.5 | 30.5 | 48.4 | 76 | 125 | 195 | 305 | 484 | 760 | 1000 | 1600 |
| Equal parts | 8 | 11 | 17,6 | 27.5 | 44 | 69 | 110 | 176 | 275 | 440 | 690 | 900 | 1300 |
| Permissible pressure differential(MPa) | ≤ Nominal Pressure |
| 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 | Double-seat plunger-guided spool valve |
| Flow Characteristics | Linearity, equal percentage |
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