| 1 | Electric Quarter-Turn Actuator | An electric motor drives a gearbox through 90° or similar rotary travel. | Approximately 10–4,000 N·m | On/off, inching, or modulating service | 24 VDC, 110/230 VAC, 4–20 mA, fieldbus | IP65–IP68; enclosure rating depends on design | Butterfly valves, ball valves, dampers, water treatment |
| 2 | Electric Multi-Turn Actuator | An electric motor produces multiple shaft rotations to move a linear valve stem. | Approximately 20–10,000 N·m | On/off, regulating, or positioning service | Local controls, 4–20 mA, remote I/O, digital networks | IP55–IP68; weatherproof or hazardous-area versions available | Gate valves, globe valves, sluice gates, power plants |
| 3 | Pneumatic Double-Acting Actuator | Compressed air is supplied alternately to both sides of a piston or diaphragm. | Approximately 20–100,000 N·m | Frequent cycling and fast on/off operation | Solenoid valve, pneumatic positioner, 4–20 mA | IP65–IP67; ATEX/IECEx versions may be available | Process isolation, chemical plants, compressed-air systems |
| 4 | Pneumatic Spring-Return Actuator | Compressed air moves the actuator while a spring returns it to a safe position. | Approximately 20–50,000 N·m | Emergency shutdown and fail-safe isolation | Solenoid valve, pneumatic positioner, emergency trip system | IP65–IP67; hazardous-area construction is common | Oil and gas, LNG, refining, combustion safety systems |
| 5 | Hydraulic Actuator | Pressurized hydraulic fluid generates high linear or rotary force. | From several kN to above 1,000 kN; torque varies by design | High-load, heavy-duty, or subsea operation | Hydraulic power unit, proportional valve, electro-hydraulic control | Application-specific; subsea and marine protection available | Large pipelines, hydroelectric facilities, steel mills, subsea systems |
| 6 | Electro-Hydraulic Actuator | An electric motor and hydraulic circuit are integrated into one controlled package. | High thrust or torque; project-specific sizing | Modulating service and independent emergency operation | 4–20 mA, digital control, local emergency controls | Weatherproof and hazardous-area configurations available | Remote pipelines, offshore platforms, turbine bypass systems |
| 7 | Linear Electric Actuator | A motor and screw, belt, or linear-drive mechanism produce axial movement. | Approximately 0.5–500 kN thrust | Positioning and modulating control | 24 VDC, 230 VAC, analog command, digital feedback | IP54–IP68 depending on enclosure and environment | Control valves, HVAC systems, water networks, dosing systems |
| 8 | Diaphragm Pneumatic Actuator | Air pressure acts on a flexible diaphragm connected to a valve stem. | Typically up to approximately 100 kN thrust | Continuous throttling and control-valve service | Pneumatic signal, electro-pneumatic positioner, 4–20 mA | Process-dependent; suitable materials selected for the medium | Steam, water, chemical processing, power-generation control loops |
| 9 | Quarter-Turn Scotch-Yoke Actuator | A piston-and-yoke mechanism converts linear piston movement into rotary torque. | Approximately 500–500,000 N·m | High-torque isolation and emergency shutdown | Pneumatic or hydraulic control; solenoid trip systems | IP65–IP68; hazardous-area options are widely used | Large ball valves, pipeline stations, terminals, offshore facilities |
| 10 | Smart Modulating Actuator | An actuator with integrated electronics for position control, diagnostics, and communication. | Application-specific; commonly tens to several thousand N·m | Continuous or intermittent positioning | 4–20 mA, HART, Modbus, Profibus, Ethernet-based networks | IP65–IP68; diagnostic and condition-monitoring functions vary | Smart water networks, process automation, energy management, remote assets |