AUTORK's two fluid-power lines — electro-hydraulic and gas-over-oil actuators — serve high-torque/thrust emergency-shutdown duties and long-distance gas-pipeline line valves respectively, distinct from the electric series.

Electro-Hydraulic Actuators

An organic combination of hydraulic, mechanical, electronic and control technologies; they overcome the low precision of pneumatic and the poor controllability of electric devices, with a simple structure and true mechano-electro-hydraulic integration — no external oil source or piping required; custom designs available.

Key application characteristics:

• Large torque and thrust
• Short stroke times
• Valve operation continues even without mains power
• Applications: oil pipelines, tank-farm emergency shutdown, water hammer prevention and emergency closure, wellheads, petrochemical plants, blast-furnace pressure-relief stacks in steel works, gas quick-closing valves in power plants and mines

Intelligent electro-hydraulic actuator

EHA variant

EHA variant 2

EHA variant 3

Gas-over-Oil Actuators

The gas-over-oil actuator is core equipment of long-distance natural-gas transmission pipelines. Installed mostly in remote locations with poor infrastructure, they demand high automation, safety, reliability and long continuous running cycles, while remaining light, easy to transport/install/maintain, and remotely monitorable.

Main specifications (official):

Item	Value
Driven ball-valve bore	DN100 ~ DN1,400
Output torque	20kNm ~ 500kNm
Working temperature	-20℃~+85℃ (optional -40℃~+80℃)
Power supply	12VDC/24VDC solid-state LiFePO4 battery
Drive	Scotch yoke

Gas-over-oil actuator

GOO variant

GOO variant 2

The LiFePO4 battery plus scotch-yoke drive combination lets the actuator perform remote monitoring and emergency strokes on dual energy inputs — well matched to unattended line-valve duty.

Selection Notes

• High-thrust emergency duties (tank farms, wellheads, water hammer): electro-hydraulic, customized per valve torque and stroke time
• Pipeline line-break ball valves: gas-over-oil, checking the 20~500kNm range against bore and differential
• Full data is in AUTORK's official electro-hydraulic catalogue and selection manual (see the brand overview for links)

For the group's export counterparts (3~700kN intelligent electro-hydraulic and gas-over-oil actuators) see our Greatork column.