Brand: Rotork

Rotork CQP Compact Helical Pneumatic Quarter-Turn Actuator

Name: Rotork CQP Compact Helical Pneumatic Quarter-Turn Actuator
Brand: Rotork
SKU: CQP

Description

Rotork CQP compact helical pneumatic quarter-turn actuators, CQ Range

The Rotork CQ Range is a concentric, balanced actuator for quarter-turn valves in which a helical mechanism turns straight piston travel into 90 degrees of shaft rotation. The pneumatic version is the CQP, available in double-acting and spring-return form. It aims to deliver the torque level of a scotch-yoke actuator within a much smaller envelope, which matters on skids, pipe racks and packaged plant where space is tight. Seven Star LLC supplies CQP actuators in Oman and the GCC as an independent supplier in Muscat. This page uses the CQP model code to explain the range.

CQP specifications

Parameter	Specification
Manufacturer / part number	Rotork / CQ Range, pneumatic CQP (hydraulic CQH exists in the same range)
Operating pressure, pneumatic	Up to 7 bar (175 psi)
Standard torque output	Up to 150,000 Nm (1.3 million lbf.in); larger and hydraulic designs on request
Temperature range	Standard -30 to +100 °C; low -40 to +100 °C; extreme low -60 to +100 °C; up to 160 °C on request
Stroke adjustment	Standard 0 to 5 degrees; rotation beyond 90 degrees available on request
Body sizes	010, 020, 030, 040, 050, 060, 070, 080, 090, 100, 110, 120
Cylinder size code	300 to 980 (pneumatic)
Execution types	Double-acting, spring-return fail close, spring-return fail open
Flange drilling	F14 to F60 depending on body size
Maximum shaft size	48 mm (size 010) up to 220 mm (sizes 110 and 120)
Certifications listed	IP66M/68M, ATEX Directive, PED Directive, EAC conformity, ISO 9001:2008 management system, certified suitable for use at SIL3

Decoding a CQP model number

The brochure example is CQP-040-435 A/C 1-A-F25-072. Reading it left to right: CQ is the compact helical actuator, P is pneumatic supply, 040 is the body size, 435 is the cylinder size, A is the seal material, C is the execution (spring-return fail close), 1 is the spring or double-acting module, A is the assembly type, F25 is the flange drilling and 072 is the maximum shaft size in millimetres. Each field narrows a particular choice.

Code field	Options
Seals	A = NBR (-30 to +100 °C); B = Viton (-20 to +100 °C); C = fluorosilicone (-40 to +100 °C); E = fluorosilicone (-60 to +100 °C)
Execution	C = spring-return fail close; O = spring-return fail open; D = double-acting
Assembly	A = external tie rods (sizes 010 to 090); B = threaded flange (010 to 090); C = internal tie rods (100 to 120)
Flange	F14 (010); F16 (010 to 030); F25 (020 to 040); F30 (040 to 060); F35 (050 to 080); F40 (070 to 100); F48 (090 to 120); F60 (110, 120)

How the helical mechanism works

A cylinder with vertical slots is fixed to the bottom flange and a second cylinder with helical slots is connected to the pneumatic piston. Cam follower bearings, made of aluminium bronze, ride in the helical slots. Air pressure moves the piston and helical cylinder linearly while keys prevent that cylinder from rotating; the bearings follow the helical path and turn the drive shaft through 90 degrees. The torque profile naturally rises and falls in the same way as the demand of popular quarter-turn valves, as it does on scotch-yoke units, and Rotork notes that the profile can be engineered for non-standard valve torque. Body components are carbon steel, and the pneumatic cylinder is internally electroless nickel plated.

CQ Range features and options

Smallest footprint for a given torque; valve adaptation is normally within the actuator envelope.
Fully enclosed concentric design with epoxy paint as standard for corrosive atmospheres.
Closed-loop or clean-breath control circuit so ambient air does not enter the actuator.
Manual override on request, special paint specifications, and complete control packages for on-off, modulating or ESD service.
Control panels with pneumatic and hydraulic manifolds, regulators and switch boxes mounted on the actuator or remotely.

Selecting a CQP actuator: ordering checklist

Collect the valve torque curve (seating, running and unseating), the minimum air supply pressure and the required fail action. Size the actuator with the spring torque at the end of stroke and the air torque at the lowest pressure both above the valve demand. Then decide the seal grade for temperature, the assembly type and the flange. For SIL-rated safety loops, ask that the proof-test and failure-rate data be provided with the quotation. Confirm shaft size against the valve stem and whether closed-loop breathing is needed in a corrosive or dusty site.

Installation and maintenance of CQP actuators

The concentric body distributes weight evenly, which eases handling and keeps side load on the valve low. Fit the adaptor and coupling, supply clean dry air to the control package and cycle the actuator against stop bolts, setting the stroke adjustment of 0 to 5 degrees at each end. The design has been made easy to dismantle: end flange, piston, cam follower bearings and the helical slot cylinder can be reached with standard tools. Spring cartridges store energy, so follow safe release procedures before disassembly. Spares worth stocking are the seal kit and the cam follower bearings.

CQ Range applications in Oman and the GCC

CQP units are used on large ball, plug and butterfly valves in confined locations: offshore and onshore oil and gas isolation and ESD valves, refinery and petrochemical process lines, water-intake butterfly valves and power-plant duties. In the Gulf the closed-loop breathing option and high-temperature seal grades help in coastal atmospheres and sun-exposed locations, while the SIL3 suitability statement supports emergency shutdown valve work.

Information to send with a CQP RFQ

Valve type, size, class and complete torque data.
Air supply pressure range and fail direction.
Required stroke time, accessories and control package.
Ambient temperature, hazardous-area and SIL requirements.
Flange drilling, shaft or stem details, and quantity.

Documents and quotation

The Rotork CQ Range brochure is attached on this page, including the model number designation used above.

Send the valve data and air supply details and we will confirm the CQP selection and quote delivery to Oman and the GCC.

Datasheets & Documents

Brochure Rotork CQP 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 CQP Compact Helical Pneumatic Quarter-Turn

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

01What does the P in CQP stand for?

P means pneumatic supply. The same CQ range also exists in a hydraulic version, designated CQH.

02How much torque can a standard CQ actuator provide?

The standard range delivers up to 150,000 Nm (1.3 million lbf.in). Greater output and hydraulic power are available on request.

03Is the CQ certified for safety systems?

The brochure lists the actuator as certified suitable for use at SIL3, along with ATEX and PED directive conformity and IP66M/68M ingress ratings.

04What temperature range does the CQ cover?

The standard range is -30 to +100 degrees C, with low and extreme-low options down to -40 and -60 degrees C and higher temperatures up to 160 degrees C on request.

05Why choose helical over scotch yoke?

The helical design gives comparable torque in a smaller, balanced concentric body, which suits confined installations, although scotch-yoke units remain common.