Brand: Rotork

Rotork GO Range Gas-over-Oil Pipeline Valve Actuator

Name: Rotork GO Range Gas-over-Oil Pipeline Valve Actuator
Brand: Rotork
SKU: GO Range

Description

Rotork GO Range gas-over-oil pipeline actuators

The Rotork GO Range is a set of fluid-power valve actuators designed to run on the gas already flowing in a pipeline. Instead of requiring electricity or instrument air at a remote block valve, the actuator takes pipeline gas through a control manifold and uses it to pressurise oil in a pair of tanks. The pressurised oil drives a scotch-yoke quarter-turn or a linear piston actuator. Because oil, not gas, acts on the cylinder, contaminants and moisture in the gas never reach the actuator internals. Seven Star LLC quotes GO Range packages to customers in Oman and the GCC as an independent supplier in Muscat.

GO Range specifications

Parameter	Specification
Manufacturer / part number	Rotork / GO Range (gas-over-oil)
Actuator types	Double-acting rack-and-pinion and scotch-yoke (symmetric or canted yoke) quarter-turn; double-acting piston type for linear valves
Working pressure	10 to 105 barg (145 to 1,500 psig); higher on application
Maximum quarter-turn torque	600,000 Nm (5,300,000 lbf.in)
Maximum linear thrust	5,500,000 N (1,236,450 lbf)
Temperature range	Standard -29 to +60 °C; low option -46 to +40 °C; others on request
Hazardous-area approvals listed	ATEX/IECEx II 2 G Ex e, d, ia IIB T4 IP65 minimum; UL/CSA Class I Div 1 Groups C and D, Class II Div 1 Groups E, F and G, NEMA 3 minimum
Gas/oil tanks	Externally painted carbon steel with dip stick, removable oil filter and magnetic ring; PED, ASME VIII Div. 1 (U stamped or not) available
Manual override	Two independent hand pumps, one for each direction
Control manifold	Modular multi-function block with leak-free poppet valves, anodised aluminium, fail-safe versions

How gas-over-oil actuation works

Line gas enters the multi-function manifold, which routes it to one of the two gas/oil tanks. Gas pressure pushes the oil from that tank to one side of the actuator piston while the opposite tank accepts the return oil and vents its gas. Reversing the routing reverses the stroke. Two hydraulic flow-control valves meter the oil in each direction, giving a smooth and adjustable stroke time that a direct gas actuator cannot provide. The controls are rated for the full line pressure, so a failed pressure regulator cannot overload the system, and a stainless gauge shows the gas supply pressure. If supply is lost, the two hand pumps move oil directly to operate the valve; selector valves permit local operation and dual pumps prevent oil mixing between the tanks.

GO Range control functions for pipeline safety

Function	Purpose
Local and remote control	Operate by levers in the gas block or by solenoid valves; two solenoids for open and close
Torque limit	Limits maximum output to protect a stuck valve or stem
High differential open inhibit	Blocks opening when the differential across the valve exceeds a set point; pneumatic or electric
Low pressure close	Closes the valve automatically when line pressure falls below a set point
Pneumatic line break	Closes the valve on a rate of pressure drop greater than a set point
Electronic line break (ELB)	Self-contained electronic monitor with rate-of-drop and rate-of-rise, high and low pressure actions, partial stroke and manual reset
Electric ESD	Dedicated solenoid valve moves the actuator to its fail-safe position when de-energised
Opposite movement inhibit	Prevents a reverse stroke once a stroke has begun
Partial stroke test	Pneumatic partial stroke using pneumatic and mechanical devices

Options and accessories for GO actuators

Lockable high-pressure ball valve for isolating the system during maintenance.
High and low inlet pressure select, and a second inlet gas connection for an alternative supply.
Custom particulate gas filtration and a dehydrator filter for removing water from incoming gas.
Back-up gas tank to complete a stroke if the gas supply fails.
Electric pressure switch for indication when pressure drifts from the set point.
Local/remote selector that gives priority to local mode, and hand-pump locking device with an indication switch.
Lockable 316 stainless steel control cabinet at IP65 minimum.

Selecting a GO Range package: ordering checklist

Provide the valve torque or thrust at the minimum line pressure that will be available, since the actuator must be sized for the lowest supply, not the design pressure. Specify whether the valve is quarter-turn or linear, the fail action required on loss of signal or pressure, the stroke time, and the functions listed in the table above. Ask Rotork for the cabinet material and certification if the location is hazardous, and confirm gas quality because sour or wet gas drives filter, dehydrator and material choices. Because the standard certification statement lists ATEX/IECEx and UL/CSA categories for the design, always give the exact area classification and gas group so the package is built to it.

Installation, commissioning and maintenance of gas-over-oil actuators

Mount the actuator on the valve using the correct bracket and coupling, connect the tapping to the pipeline gas supply with an isolation point, and fill the tanks to the dip-stick mark with the specified oil. Bleed air from the hydraulic lines, adjust the two flow-control valves to reach the target stroke times, then test local, remote, manual and every protective function in turn. Line-break and ELB set points should be validated against real pipeline pressure behaviour to avoid nuisance trips. During maintenance check oil level and cleanliness (the filter and magnetic ring collect debris), gas filter condition, hand-pump function and seal condition. Keep spares for solenoids, filter elements and pressure switches.

GO Range applications in Oman and the GCC

Gas-over-oil actuators suit remote pipeline block valves where there is no instrument-air or power supply: gas transmission lines, compressor station isolation, metering and regulating stations, and gas gathering systems. Rotork states that it has designed and supplied direct-gas actuators to many national and international end-user specifications. In Oman and the GCC the harsh sun, dust and large temperature swings call for a stainless control cabinet, correct paint and the right oil and seal selection, and low-temperature options are available for colder desert nights at altitude. Fire-safe and fail-safe designs can be combined with the ELB for pipeline break protection.

Information to send with a GO Range RFQ

Valve type, size, class and torque or thrust at minimum line pressure.
Minimum, normal and maximum gas supply pressure, and gas composition.
Fail action and ESD requirements.
Required functions: line break, low pressure close, high differential inhibit, partial stroke.
Area classification, ambient range and site corrosion category.
Control signals available (solenoid voltage) and any panel or SCADA interface.
Quantity and delivery location in Oman or the GCC.

Documents and quotation

The Rotork GO Range brochure is attached on this page and lists the functions and options in more detail.

Send the valve and pipeline data and Seven Star LLC will confirm the GO Range configuration and quote delivery to Oman and the GCC.

Datasheets & Documents

Brochure Rotork GO Range Brochure Download

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About brand

Rotork is a British flow control company best known for electric valve actuators. Jeremy Fry founded Rotork Engineering Company in Bath in 1957, the year its first actuator, the 100A, went on sale, and the group is still headquartered in Bath and listed on the London Stock Exchange. Today Rotork makes electric, pneumatic, hydraulic and electro-hydraulic actuators, gearboxes, precision regulators and valve positioners.

Seven Star LLC is an independent supplier listing Rotork actuators, Rotork Fairchild regulators, YTC positioners and spare parts for buyers in Oman and the GCC. Replacement units are matched from the actuator nameplate and wiring diagram number.

Rotork company profile

Origin	Founded by Jeremy Fry in 1957 in Bath, England; first product the 100A valve actuator
Headquarters	Brassmill Lane, Bath, United Kingdom
Ownership	Rotork plc, a public company listed on the London Stock Exchange
Acquired brands	Fairchild precision pneumatic controls (2011, Winston-Salem, USA), YTC valve positioners (Young Tech Co., Seoul, 2014), Mastergear gearboxes (2016)
Product families	Intelligent electric actuators, control valve actuators, electro-hydraulic and fluid power actuators, gearboxes, precision regulators, positioners and network control systems

Milestones

1957: Jeremy Fry founds Rotork in Bath, England; the first product is the 100A valve actuator.
2011: Fairchild precision pneumatic controls (Winston-Salem, USA) is acquired.
2014: YTC valve positioners (Young Tech Co., Seoul) is acquired.
2016: Mastergear gearboxes is acquired.

Rotork actuators, regulators and positioners

Series	Type	Typical use
IQ3	Intelligent multi-turn electric actuator	Gate and globe valves, penstocks and sluice gates; non-intrusive setup with a Bluetooth setting tool, double-sealed enclosure, data logging
IQT3	Intelligent part-turn electric actuator	Ball, butterfly and plug valves and dampers, with the same setup and diagnostics as IQ3
CVA	Precision control valve electric actuator	Continuous modulating control of linear and part-turn control valves where instrument air is not available
CMA	Compact modulating electric actuator	Small control valves, chemical injection and metering pumps
Skilmatic SI3	Self-contained electro-hydraulic actuator	Spring-return fail-safe and ESD duty with partial stroke testing, needing only an electrical supply
GP / GH	Scotch yoke pneumatic (GP) and hydraulic (GH) actuators	Large quarter-turn valves on pipelines and ESD service; spring-return or double-acting
CP	Compact pneumatic quarter-turn actuator	Smaller on-off ball and butterfly valves on plant air
Fairchild 10, 30, 55, 66, M11, 81	Precision pressure regulators	Instrument air to positioners and actuators, test benches; Model 66 in stainless steel for corrosive and offshore sites
Fairchild 1000	No-bleed precision regulator	Saves instrument air or gas where continuous bleed is not acceptable
Fairchild 10BP, 4000ABP	Back pressure regulators	Holding upstream pressure in process and test systems
YTC YT-1000, YT-3300	Valve positioners	Electro-pneumatic (YT-1000) and smart HART (YT-3300) positioning of linear and rotary pneumatic actuators

Where Rotork equipment is used

Rotork actuators are common on oil and gas pipelines and terminals, refineries and gas plants, water and wastewater networks, desalination plants and power stations. Electric IQ actuators handle isolation valves on long pipelines and water mains, often networked over Rotork Pakscan, Modbus or another fieldbus. Skilmatic and scotch yoke actuators cover emergency shutdown valves, and Fairchild regulators and YTC positioners sit on pneumatic control valves throughout process plants.

Ordering Rotork actuators and spare parts: what we need

Send photos of the actuator nameplate with the model, serial number and wiring diagram number; the wiring diagram is usually inside the terminal cover. Rotork can identify the original build, including options and control interface, from the serial number. For a new application add the valve type and size, required torque or thrust, operating time, mounting flange (ISO 5210 or ISO 5211), power supply, control signal or network protocol, fail-safe requirement and hazardous-area marking. For regulators and positioners send the full model code and the pressure or signal ranges.

Facts checked against Rotork plc company information and product data, October 2026.

Browse Rotork products by category: Valve Actuator, Regulators, Valve Positioner.

FAQ

Questions about the Rotork GO Range Gas-over-Oil Pipeline Valve Actuator

Answers from our engineering team on installation, compatibility and integration.

01Why is oil used instead of driving the actuator directly with gas?

Pressurised oil gives smooth, controllable motion and keeps gas contaminants away from the cylinder, which prevents corrosion and seal deterioration and extends actuator life.

02What pressure range does the GO Range cover?

The standard working pressure is 10 to 105 barg (145 to 1,500 psig), with higher pressures available on application.

03What happens if the gas supply is lost?

Two independent hand pumps, one for each direction, let an operator move the valve manually. A back-up gas tank is also available as an option.

04What is the electronic line break function?

It is a self-contained electronic pipeline monitor that detects rate of pressure drop or rise and high or low pressure conditions, then drives the valve to an emergency position based on user-defined parameters.

05What output can GO actuators deliver?

Quarter-turn units reach up to 600,000 Nm and linear units up to 5,500,000 N, with higher values available on request.