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
Low flow control valves are a type of top-guided single-seated control valve, characterized by their simple structure, good sealing performance, and reliable operation.
The effective and sufficient top guide system overcomes vibrations at small openings, resulting in a longer effective service life. The smaller flow coefficient expands the valve’s range of applications.
The actuator can be selected from various options, including multi-spring pneumatic diaphragm mechanisms or electric actuators.
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 G240(400-200) Kpa G280(80-240) Kpa G | Power Supply AC 200 V±10% 50HzorPower 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°CWith space heater: -35°C ~ +60°CExplosion-proof type: -10°C ~ +40°C |
| Surface Coating | Green, acrylic polyurethane enamel | Blue, acrylic polyurethane enamel |
| 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 | Unbalanced single-seat piston plug |
| Nominal diameter | DN20~200 NPS 3/4″~8″ |
| 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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