Product Short Description
Product Name: SVI II AP Digital Smart Valve Positioner
Product Overview:
SVI2-21123121 is an advanced performance 32-bit microprocessor-based digital valve positioner under Baker Hughes Masoneilan brand. It controls pneumatic actuators for industrial control valves with HART two-way communication.
Description
- Control Input Signal: 4–20 mA two-wire
- Communication Protocol: HART 5 / HART 7
- Positioning Accuracy: ±0.5% FS
- Repeatability: ±0.1% FS
- Operating Temperature: -50°C ~ +85°C
- Enclosure Rating: IP66
- Compliance: IEC 61508 SIL 2
- Air Supply Pressure: 20–150 psi
Function Features:
- Non-contact magnetic position sensing without mechanical penetration into housing
- Automatic calibration and auto-tune function for fast commissioning
- Compatible with linear and rotary pneumatic actuators, single-acting configuration
- Built-in comprehensive valve diagnostic functions
- Local LCD display and physical operation buttons usable in hazardous locations
Application Scenarios:
Oil & gas processing, petrochemical plants, power generation, pharmaceutical production, water treatment control valves.
Material Composition:
Copper-free cast aluminum housing; fluoropolymer internal pneumatic seals; industrial grade electronic components.
Structural Characteristics:
Integrated mechanical and electronic assembly. Universal mounting bracket for direct installation on most valve actuators. Dual pressure gauge ports for supply and output pressure monitoring.
Working Principle:
Receives 4–20mA setpoint signal from DCS. Magnetic sensor continuously captures valve stem position. Internal controller compares actual position with target value and adjusts internal pneumatic pilot valve output to drive actuator until position matches setpoint.
Installation Requirements:
Mount rigidly on valve actuator following standard mounting template. Use clean, dry instrument air. Perform auto-calibration after mechanical installation.
Usage Notes:
Filter instrument air to remove moisture and particulates. Do not disassemble sealed housing in hazardous classified areas. Regularly review valve diagnostic data for predictive maintenance.
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