Cort, Premium British Valve Manufacturing
  • Pipeline Ball Valves
  • Pipeline Gate Valves
  • Pressure Protection Systems
  • Cort Screen Spares

Special Duty Valves

With a wealth of experience, our high skilled team can also adapt our valve designs and materials to suit specific customer requirements.

Our pipeline ball and gate valves are supplied as follows:

Bore Type (standard or specialist sizes)

Our ball valves can also be supplied as sphere launchers or receivers.

Pressure shell materials


Parts are normally forged, and typical materials are:

Where appropriate, internal coatings are:

Seal materials


Seal materials are normally ‘O’ rings manufactured to Cort specifications from nitrile, Viton and HNBR elastomers. Other seals are produced from a number of materials, including nylon, graphite, stainless steel, PTFE and Tefzel, to give the widest compatibility with pressure temperature and chemical conditions.

Internal trim materials

Sizes and Pressure Class

Ball 150mm – 1200mm (6” – 48”)
Class 150 – 2500
Gate 150mm – 1200mm(6” – 48”)
Class 150 – 1500
Wafer Gate 150mm – 1800mm (6” – 72”)
Class 150 – 300

End Connection

Any flange, weld or coupling connection can be fitted to suit customer requirements.

Fire Safety and Fire Shrouding

Cort C-B5 ball valves are constructed to a fire-safe design, which has been tested/qualified in various sizes/classes to the following standards: BS 6755 pt2, API RP6F, API 6FA, API 607.

Gate valves can also be offered in fire safe design and construction. The Cort C-G4 gate valve is qualified to BS 6755 pt2 in sizes 16” and above, in class 300 and 600.

Our scotch yoke actuators and control systems are shrouded to protect them in case there is a fire, and to ensure valve operation is still possible during the initial stages of a fire.

Flow Control Duty

The C-B5 trunnion mounted ball valve can also be supplied with retracted, hard-faced seats, together with a suitable modulating actuator and control system.

Valve environment

Sour service

We regularly manufacture our valves to comply with the requirements of NACE MR-01-75.