Multi-Stage Control Valve
Multi-stage control valves use either a multi-stage cage-type sleeve plug or an axial flow labyrinth-type plug. The multi-stage pressure reduction fully controls the flow velocity of the medium passing through the valve, significantly reducing the noise generated by high-pressure gas or steam within the valve.
The stable multi-stage pressure reduction effectively prevents cavitation in liquids, making it a stable control valve for use in high-pressure medium environments.
Optional multi-spring pneumatic diaphragm actuator or electric actuator available.
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
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| Multi-spring Type | Integrated Smart Type with Internal Control Box
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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 | Multi-stage throttling plug |
Nominal diameter | DN20~200 NPS 3/4″~8″ |
Nominal pressure | PN16~420, CLASS 150LB~2500LB |
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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