Three-Way Control Valve
Three-way control valves have two modes of operation: mixing and diverting. In certain situations, they can replace two two-way valves and one three-way pipe fitting, making them widely used.
They achieve regulation of parameters such as pressure, flow, temperature, and liquid level. The valve plug structure uses a thin-walled cylindrical window design with side-guided plug, offering good stability, low vibration tendency, low noise, high allowable pressure differential, and simple piping.
For smaller nominal diameters and pressure differentials, mixing valves can be used interchangeably in diverting applications. However, for nominal diameters larger than DN100 and higher pressure differentials in diverting applications, they cannot be used interchangeably.
Performance
- Flow characteristics: Linear, Equal percentage, Quick opening
- Adjustable range: 50:1 (when CV <6.3, 30:1)
- Rated CV value: Equal percentage CV 1.6~630, Linear CV 1.8~690
- Allowable leakage rate: Hard seal: Class IV (0.01% of valve rated capacity) Soft seal: Class VI (Bubble tight)
- Leakage standard: GB/T 4213
Actuator Selection
| Pneumatic Diaphragm Actuator | Fully Electronic Electric Actuator
|
| Multi-spring Type | Integrated Smart Type with Internal Control Box
|
Application | Regulation, On/Off | Regulation |
Air Supply Pressure/Voltage | Supply Pressure (Spring Range)） 140(20-100) Kpa G 240(400-200) Kpa G 280(80-240) Kpa G
| Power Supply AC 200 V±10% 50Hz or Power Supply AC 380 V±10% 50Hz |
Connection | Air pipe connection RC1/4 | Standard: Cable entry 2-PE (G1/2″) Explosion-proof: Protective sleeve PE (3/4″) can be installed
|
Direct Action | Increasing air pressure moves stem downward, valve closes | Increasing input signal moves stem downward, valve closes |
Reverse Action | Increasing air pressure moves stem upward, valve opens | Increasing input signal moves stem upward, valve opens |
Hysteresis | ≤1%FS (with positioner) | ≤0.8%FS |
Linearity | 2%FS (with positioner) | ≤±1%FS |
Ambient Temperature | -10°C ~+70°C | Standard type: -10°C ~ +60°C With space heater: -35°C ~ +60°C Explosion-proof type: -10°C ~ +40°C |
Surface Coating | Green, acrylic polyurethane enamel | Blue, acrylic polyurethane enamel
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Optional Accessories | Electric (pneumatic) valve positioner, filter regulator, valve transmitter, solenoid valve, limit switch | Space heater |
Standard Specifications
Valve body type | Straight-through cast globe valve body |
Valve plug type | Three-way double-seat plug |
Nominal diameter | DN20~300 NPS 3/4″~12″ |
Nominal pressure | PN16~100, CLASS 150LB~600LB |
Connection type | Flange FF, RF, MF, RTJ; Welding SW, BW |
Face-to-face dimension | Complies with IEC 60534 |
Bonnet types | Standard type (-5°C~230°C); Extended bonnet with cooling fins (for temperatures above 230°C); Low-temperature extended type (-196°C~-45°C); Bellows sealed type, Jacketed type |
Packing | V-ring PTFE packing, flexible graphite packing, etc. |
Gasket | Metal-reinforced graphite gasket |
Actuator | Pneumatic multi-spring diaphragm actuator, piston actuator, electric smart actuator |
Surface coating | Green acrylic polyurethane paint |
Special Specifications
| Special inspections | Body material penetrant testing (PT), radiographic testing (RT), flow characteristic test, low-temperature test. |
| Special treatments | Nitriding treatment for internal parts, hard alloy coating for sealing parts |
| Special cleaning | Completely oil-free, dehydration treatment |
| Special specifications | Special piping or special air fittings, vacuum service conditions, stainless steel fasteners, special coatings |
| Special dimensions | Customized according to user’s structural length or external dimensions |
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