G4 Plug Valve ASME 150

Supplied to chemical plants for nearly 50 years, the G4 plug valve has a large area locked in PTFE sleeve with a secondary reverse lip PFA diaphragm seal. The standard valve has an inline adjustable rocker arm for reseating the plug.

We can supply the Marathon G4 valve with additional O-ring seals around the stem for even higher emission control. For even further stem sealing, we can supply the Durco TSG4 severe service valve with self adjusting Belleville washers, providing a third sealing arrangement with a live loaded PTFE cup and cone seal pack. 

The G4 plug valve can be used in a number of different applications with a carbon steel body. For use in highly corrosive applications, it is also available in exotic metallics.

Top Works Drawings

Actuation Torques

Installation, Maintenance and General Guidance PDF

Dimensions below to suit ASME 150 flange piping systems

To suit pipework NB Face – Face A CL to end of wrench B CL to top of wrench C
Inches Inches Inches Inches
1/2″ 4.3 6.0 4.8
3/4″ 4.6 6.0 4.8
1″ 5.0 7.0 4.8
1.1/2″ 6.5 9.0 5.5
2″ 7.0 12.0 6.3
3″ 8.0 18.0 7.5
4″ 9.0 30.0 9.0
6″ 10.5 G/O G/O

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