Xiamen ZhiCheng Automation Technology Co., Ltd
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The GF Flowline FU-77V is an intrinsically safe, microprocessor-based electro-pneumatic positioner engineered for precise valve actuation in hazardous process environments. Featuring an aluminum-alloy housing with ATEX/IECEx Zone 1/21 certifications, it converts 4–20mA control signals into pneumatic output (0.2–1.6 MPa) to position rotary or linear valves with 0.15% accuracy. The unit integrates dual-pressure sensors, adaptive digital tuning (DynaTune®), and an OLED display for real-time diagnostics. Designed for DIN rail or direct valve mounting (ISO 5211), its IP66/NEMA 4X-rated enclosure withstands extreme temperatures (-40°C to +85°C), vibration (10g @ 55Hz), and corrosive atmospheres. Supports NAMUR NE 107 diagnostics and SIL 2 safety compliance for critical control applications.
Mission-critical performance parameters:
Critical process valve control scenarios:
Industry-leading precision and reliability:
Advanced diagnostic intelligence:
| Parameter Category / Specific Parameter | Typical Value / Description |
|---|---|
| Product Type | Electro-Pneumatic Valve Positioner |
| Model Number | FU-77V |
| Primary Function | Precisely controls the pneumatic actuator position based on an analog input signal, ensuring the valve stem reaches the commanded position. |
| Input Signal | 4-20 mA DC (Standard, 2-wire); Optionally 0-20 mA, 0-10 V DC, or others (may require configuration/different variant). |
| Supply Air Pressure | 1.4 - 7 bar (20 - 100 psi) |
| Output Air Pressure | Adjustable, tracks input signal proportionally (e.g., 0.2 - 1.0 bar / 3 - 15 psi for 3-15psi actuators; scales with supply). |
| Air Consumption (Static) | < 0.1 Nl/min (Typically very low when steady state) |
| Air Consumption (Dynamic) | Dependent on actuator size and stroking speed; Specified in liters/min or scfm at defined pressure. |
| Accuracy | ≤ ±0.5% of span (Full Scale) (High precision class typical for GF positioners) |
| Hysteresis | ≤ 0.2% of span |
| Linearity | ≤ ±0.5% of span |
| Repeatability | ≤ 0.1% of span |
| Response Time | Adjustable (Typically 1-30 seconds for full stroke); Fast response versions available. |
| Housing Material | Robust Plastic (e.g., Polyamide/PA) or Aluminum Alloy; Corrosion resistant. |
| Protection Rating | IP65 / IP66 / IP67 (Dust-tight & protected against water jets/immersion) - Common standard. |
| Ambient Temperature Range | -30°C to +85°C (-22°F to +185°F) [Operating]; Wider storage range possible. |
| Process Temperature Range | -60°C to +200°C (-76°F to +392°F) or higher (Depends on stem extension/connection kit used). |
| Mounting | Direct mount to rotary (ISO 5211) or linear actuators (IEC 60534-6 / VDI/VDE 3845); Feedback lever included. |
| Electrical Connection | M20 x 1.5 or ½" NPT conduit entries; Terminal block (screw or spring clamp). |
| Pneumatic Connections | Input (Supply): ¼" NPT or G ¼; Outputs (A/B): ¼" NPT or G ¼ (Depending on actuator type - Single or Double Acting). |
| Compliance & Certifications | ATEX / IECEx (Ex ia/ib IIC T4...T6 Ga/Gb), CE, SIL 2/3 (IEC 61508), EAC, FM, CSA (Specific approvals depend on variant & market). Critical for hazardous areas. |
| Communication (Optional) | May support HART protocol (over 4-20mA) or Foundation Fieldbus / PROFIBUS PA (Requires specific variant/model suffix). |
| Display & Local Interface | Integral LCD display showing %, mA, error codes; Push buttons for calibration, configuration, air flow adjustment. |
| Split Ranging | Configurable (e.g., 4-12mA / 12-20mA) |
| Action | Direct (Air-to-Open) or Reverse (Air-to-Close) - Configurable. |
| Fail-Safe Action | Configurable position upon signal or air failure (e.g., hold last position, open, close - depends on actuator/accessories). |
| Approximate Weight | 0.8 - 1.5 kg (1.8 - 3.3 lbs) (Depends on housing material). |
| Typical Applications | Control valves in process industries (Oil & Gas, Chemical, Petrochemical, Power, Water Treatment, Pharma). |
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Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.
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