Greatork's drive portfolio goes beyond electric: intelligent electro-hydraulic actuators (3~700kN output), gas-over-oil actuators driven by pipeline natural gas, and the BA/ZJ gearbox families together form a complete electric-hydraulic-pneumatic-mechanical chain for pipelines, storage and process industries.
Compact with no external hydraulic station; on-off and modulating types suit linear and quarter-turn control valves (ball, butterfly). A large OLED shows valve opening, status and alarms in real time; on power failure the valve can still be operated via hand pump or accumulator.
Intelligent electro-hydraulic actuator (image source: Greatork official website)
Specifications (official):
| Item | Value |
|---|---|
| Torque range | 150Nm ~ 450,000Nm (thrust 3kN ~ 700kN) |
| Speed range | 0.5s ~ 240s |
| Control signals | On/off, 4-20mA analog, bus |
| Control precision | < 0.5%; repeatability 0.5% |
| Power | 500W(24V)/1kW(220V)/2kW(380V) |
| Temperature | -50°C ~ +70°C |
| Protection | IP66 / IP68 |
| Explosion-proof | ExdIIBT4 Gb / ExdIICT4 Gb |
| Fail-safe | Open, close or hold position |
| Functional safety | SIL2 certified |
Distinctive: anti-pipeline electric leakage — for valves on cathodically protected pipelines, internal wirings and grounding are insulated from the shell; two grounding terminals and a dedicated grounding cable entry are provided.
For line-break ball valves on gas pipelines: pipeline natural gas (or external nitrogen cylinders) as the power source, hydraulic oil as the transmission medium — gas pressure is converted to hydraulic force driving a scotch yoke, turning cylinder stroke into 90° valve rotation.
Gas-over-oil actuator (image source: Greatork official website)
| Model | Output torque | Input torque | Ratio | Temperature | Protection | Flange |
|---|---|---|---|---|---|---|
| BA (multi-turn) | 300 ~ 142,000Nm | 700~1,000Nm | 6.3:1 ~ 441:1 | -20~+60℃ | IP67 | ISO 5210 |
| ZJ (part-turn) | 30 ~ 22,000Nm | 30~1,000Nm | 1:1 ~ 289:1 | -20~+60℃ | IP67 | ISO 5211 |
BA features tapered roller bearings with worm, removable drive bush and adjustable mechanical limits; high-strength cast-iron case. ZJ complies with ISO 5211 for manual or actuator drive.
BA multi-turn gearbox (image source: Greatork official website)
For the group's domestic AUTORK electric series (IK/IKT/AK/AKT/AKQ) see our AUTORK column; for intelligent electric actuators see the AVA/AVAT article in this column.
