Rotork GTS Range Stainless Steel Pneumatic Valve Actuator

Rotork GTS Range stainless steel rack and pinion actuators

The Rotork GTS Range is the stainless steel member of the GT family of pneumatic rack and pinion actuators. The body and end caps are electro-polished AISI 316L stainless steel and the pinion is also 316L, with screws in A4 stainless steel. That makes the actuator suited to the harsh, corrosive surroundings of petrochemical, marine and offshore installations, as well as the sanitary requirements of pharmaceutical and food and beverage plants where a smooth, cleanable surface matters. Rotork lists seven body sizes covering torque from 39 to 1,150 Nm, in double-acting and spring-return versions with travel stops in both directions.

The GTS uses the same basic working principle as the GT Range but trades the anodised aluminium body for stainless steel, and adds a smaller size list: 52, 63, 75, 83, 110, 127 and 160. For higher volume, low-cost duty on a mild site, the aluminium GT or GTE ranges remain the economical choice, and our site lists those as separate pages.

Technical specifications of the GTS Range

The product page also lists ATEX 2014/34/EU and a GTS IP66/IP67 certificate in the documentation set.

How the GTS works and how to read its torque tables

The operating principle is that of every rack and pinion actuator: two pistons with racks drive a pinion through 90 degrees. Double-acting versions are pressurised in both directions, spring-return versions use stacked springs for a fail-safe direction. The flyer gives double-acting output for 2 to 10 bar. At 10 bar the figures are 39.0 Nm for size 52, 58.0 Nm for 63, 100 Nm for 75, 145 Nm for 83, 290 Nm for 110, 580 Nm for 127 and 1,150 Nm for 160.

For spring-return units, a separate table lists spring torque and air torque at 0 and 90 degrees for each spring count of 6, 8, 10 or 12 springs on the smaller sizes. A selection must check that the spring torque at the end of stroke exceeds the valve seating torque, while the pneumatic torque at the lowest available pressure still exceeds the valve breakaway torque, with margin.

Dimensions, mounting and weights

The flyer includes a dimension table. Valve flange sizes are F03 and F05 for size 52, F05 and F07 for sizes 63, 75 and 83, F07 and F10 for sizes 110 and 127, and F10 and F12 for size 160. Weights for double-acting units run from 2.6 kg for size 52 to 32 kg for size 160; spring-return versions are slightly heavier, from 2.7 kg to 36 kg. The air displacement for double-acting units ranges from 0.25 dm3 for size 52 to 7.0 dm3 for size 160, which helps with air consumption and stroke-time calculations.

Selection and ordering checklist for the GTS Range

• Valve torque, safety factor and service (on/off or modulating).
• Double-acting or spring-return, and the number of springs.
• Supply pressure at the actuator and air quality.
• Ambient temperature, including high-temperature seals if above 70 degrees C.
• ISO 5211 flange size and drive, matching the valve.
• Corrosive atmosphere, washdown or sanitary requirement.
• Stainless steel accessories if a fully stainless package is wanted.

Installation, commissioning and maintenance

Install the GTS using stainless or coated mounting hardware to avoid bimetallic corrosion, and match the position indicator to the valve before coupling. Connect air through the NAMUR or port connection; filtered air is required per the supply specification. Set travel stops at both directions, which the GTS provides with plus or minus 5 degrees adjustment. The GT and GTS installation and maintenance manual covers spring handling and seal replacement.

Service is simple: periodic cycling, inspection of seals, bearings and spring condition, and use of the specified lubricant. For washdown or marine service, rinse salt from the body and check that cable glands and exhaust breathers are intact. Always depressurise before service, and be careful with spring-return units that contain loaded springs.

Typical applications in Oman and the GCC

Stainless actuators earn their place on seawater and brine butterfly valves, chemical injection skids, offshore platforms and port facilities, desalination plants, and pharmaceutical and food processing sites in the Gulf. Where salty air and humidity attack aluminium and painted surfaces, the 316L body, pinion and fasteners keep corrosion down, and where temperatures reach the upper standard limit, high-temperature seals up to 160 °C extend the use to hot-service valves.

Related Rotork pneumatic actuators

The GT Range is the aluminium body counterpart with 21 sizes and torque up to 15,300 Nm, and the GTE Range is a cost-optimised aluminium series from 2 to 6,300 Nm. Where very high torque or a scotch yoke is needed, our site also lists the Rotork GP/GH scotch yoke actuators.

Information to send with an RFQ for the GTS Range

• Valve make, size, class, torque data and flange pattern.
• Double-acting or spring-return and fail direction.
• Supply pressure, ambient temperature and area classification.
• Environment, for example marine, offshore or sanitary.
• Quantity and delivery timing.

Documents and quotation

The Rotork GTS Range stainless steel actuator flyer is attached on this page. Send the details above and we will confirm availability and prepare a quotation for the GTS Range in Oman and the GCC. Seven Star LLC is an independent supplier in Muscat.