Hydraulic Actuators for Heavy-Duty Valve Automation
NordenFlow hydraulic actuators are engineered for precise and powerful valve control under the most demanding operating conditions.
They deliver high torque or thrust for large-diameter valves, critical shutdown systems, and modulating applications where pneumatic actuators are not sufficient.
Product Overview
Hydraulic actuators use pressurized hydraulic oil to generate high output torque or linear force.
They provide smooth, accurate, and fail-safe operation for on/off and control valves in industries where safety, reliability, and control precision are critical.
⚙️ Technical Features
- Operating pressure: 50 … 250 bar (up to 350 bar on request)
- Actuation type: quarter-turn or linear
- Torque range: 2000 … 700,000 Nm
- Stroke range (linear): up to 500 mm
- Operation modes: double-acting or spring-return (fail-open/fail-close)
- Material: carbon steel, anodized aluminium, or stainless steel (optional)
- Temperature range: −40°C … +80°C (extended −60°C available)
- Seals: NBR/FKM/PTFE (per service condition)
- Protection: IP66 / IP68
- Mounting: ISO 5211 (rotary) / ISO 15552 (linear)
- Certifications: SIL2 / SIL3 capable, ATEX compliant versions
🧩 Key Advantages
- High torque and thrust output for large valves
- Precise modulating control with smooth hydraulic motion
- Built for harsh offshore, marine, and refinery environments
- Compact design with corrosion-resistant surface treatments
- Configurable fail-safe operation (spring-return or accumulator-based)
- Compatible with PST (Partial Stroke Test) and ESD systems
🔩 Typical Applications
- ESD and blowdown valves in oil & gas pipelines
- High-torque ball and butterfly valves in refineries and terminals / through conduit gate valve
- Gate and globe valves in power generation and process plants
- Hydraulic control panels and accumulator-driven packages
- Subsea or offshore topside control systems
🧩Electro-Hydraulic Actuators (EHA)
Electro-hydraulic actuators combine the reliability and force of hydraulic systems with the convenience of electric control.
In this design, a compact electric motor drives a hydraulic pump integrated with an actuator and oil reservoir — forming a self-contained system that requires no external hydraulic power unit (HPU)
Technical Highlights
- Self-contained hydraulic power pack with motor-pump assembly
- Available for quarter-turn and linear valve actuation
- Torque range: up to 100,000 Nm (or specify)
- Power supply: 230 V AC / 400 V AC / 24 V DC
- Control modes: On/Off or Modulating (analog / fieldbus)
- Fail-safe options: spring-return or accumulator discharge
- Protection: IP66/67, ATEX optional
- Interface: ISO 5211 / ISO 15552
Hydraulic Power Units (HPU)
NordenFlow designs and supplies compact and modular Hydraulic Power Units (HPUs) to operate single or multiple actuators in safety and process control systems.
Each HPU is engineered for reliable performance under continuous operation and can be customized for onshore, offshore, or hazardous environments.
🔧 Options & Accessories
- Manual hand pump and bypass valves
- Hydraulic accumulator fail-safe module
- Solenoid control valves (SS316 / ATEX)
- Directional control valves and pressure relief valves
- Positioners and feedback transmitters (4–20 mA / HART / Profibus)
- Local control panel with selector valves
- Filter unit and oil reservoir assembly
Ask us about Actuator Sizing and Selection Considerations (section on how to choose based on torque, accumulator, functional, and adjusted speed)