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Main Features
· Precise adjustment: Continuously and accurately adjusts the valve plug opening according to control signals (such as 4–20 mA), enabling fine control of parameters including flow rate and pressure.
· Stable control: Automatically maintains stable process parameters through built-in feedback and positioning mechanisms, with strong anti-interference capability.
· Complex structure: Generally composed of an actuator, valve body, valve positioner and other components, with a more complex structure than on-off valves.
· Diverse response characteristics: Different flow characteristics (such as linear, equal percentage) can be obtained through model selection to meet various process control requirements.
· Strong adaptability: Suitable for a variety of harsh media and working conditions such as high pressure differential, high temperature and corrosive environments.
· Intelligent control: Modern control valves are often equipped with smart positioners, featuring self-diagnosis, digital communication, remote calibration and other functions.
■ Technical Specifications
| Parameter Category | Specific Parameters | Unit / Description | Typical Range / Significance |
| Basic Specification | Nominal Diameter (DN) | mm | DN15 ~ DN500+, matched with pipeline size |
| Nominal Pressure (PN) | MPa/Class | PN1.6 ~ PN32.0 (Class 150 ~ 2500) | |
| Connection Type | - | Flanged, wafer, threaded, welded | |
| Performance Parameters | Flow Coefficient (Kv/Cv) | m³/h / - | Core parameter indicating the flow capacity of the valve |
| Flow Characteristic | - | Linear, equal percentage, quick opening; determines the relationship between opening degree and flow rate | |
| Rangeability (R) | - | 30:1 ~ 100:1, ratio of maximum to minimum controllable flow rate | |
| Leakage Class | ANSI/FCI Standard | Class II ~ Class VI, with Class VI being the highest sealing standard (bubble-tight) | |
| Rated Stroke | mm | Stroke distance of the valve plug from fully closed to fully open | |
| Response Time | s | Generally 1~10 seconds, depending on the size and type of actuator | |
| Actuator | Actuator Type | - | Pneumatic diaphragm, pneumatic piston, electric, electro-hydraulic |
| Air Supply Pressure | MPa | 0.14 ~ 0.7 MPa (standard pneumatic) | |
| Power Supply Voltage | V | AC220V, AC380V, DC24V (electric type) | |
| Output Force / Torque | N / N·m | Must be greater than the required unbalanced force / torque of the valve | |
| Control & Signal | Input Signal | mA / Communication | 4-20mA (analog), HART / Fieldbus / PROFIBUS (digital) |
| Positioner Type | - | Mechanical, analog electro-pneumatic, intelligent digital | |
| Position Feedback | mA / % | 4-20mA or 0-100% opening signal feedback | |
| Medium & Environment | Valve Body Material | - | WCB carbon steel, 304/316 stainless steel, alloy steel, special alloy |
| Trim Material | - | 304, 316, 17-4PH, Stellite alloy, ceramic (wear and corrosion resistant) | |
| Medium Temperature Range | ℃ | -196℃ ~ +600℃ (varies greatly depending on material and design) | |
| Ambient Temperature Range | ℃ | -40℃ ~ +85℃ (operating range of actuator and positioner) |