Pneumatic diaphragm three-way control valves, when paired with electric or pneumatic valve positioners, enable automatic regulation and control of fluid media within process pipelines. They are widely used to maintain precise process parameters—such as pressure, flow rate, temperature, and liquid level—at specified values for gases, liquids, and steam. The valve plug features a cylindrical thin-walled window structure with lateral guidance. The valve body adopts a three-way configuration—either one inlet and two outlets (pneumatic three-way diverter control valve) or two inlets and one outlet (pneumatic three-way diverter control valve)—enabling fluid mixing for heating or cooling, or unequal fluid diversion to meet diverse operational requirements. The pneumatic diaphragm three-way control valve body offers advantages including compact structure, light weight, responsive operation, low pressure drop, high valve capacity, accurate flow characteristics, and easy maintenance. It is applied in proportional or bypass control, particularly suited for fluid temperature control systems in petroleum industry heat exchangers. A single three-way valve can replace two single-seat or double-seat valves, occupying minimal space and reducing piping installation costs.
Pneumatic Diaphragm Three-Way 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) | Diverter valve | 6.3 | 8.5 | 13 | 21 | 34 | 53 | 85 | 135 | 210 | 340 | 535 | 800 | 1360 |
| Combined valve | - | - | - | - | - | - | 85 | 135 | 210 | 340 | 535 | 800 | 1360 |
| Permissible pressure differential(MPa) | 3.5 | 3.2 | 2.2 | 2.2 | 1.4 | 1.38 | 0.94 | 0.61 | 0.51 | 0.36 | 0.2 | 0.19 | 0.13 |
| Nominal Pressure(MPa) | 1.6, 2.5, 4.0, 6.4, 10.0 |
| Actuator Model | ZHA/B-22 | ZHA/B-23 | ZHA/B-34 | ZHA/B-45 | ZHA/B-56 |
| Rated stroke(mm) | 16 | 25 | 40 | 60 | 100 |
| 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) |
| Capping Method | Bolt-clamping type |
| Sealing Packing | V-shaped PTFE packing, V-shaped flexible graphite packing |
| Valve Core Type | Dual-Guide Sleeve-Type Spool |
| Flow Characteristics | Linearity, equal percentage |
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