G4 Plug Valve ASME 150

The G4 plug valve has been supplied for nearly 50 years to chemical plants, the valve has a large area locked in PTFE sleeve with a secondary reverse lip PFA diaphragm seal. The standard valve has a inline adjustable rocker arm to reseat the plug. For even higher emission control we can offer the Marathon G4 valve with additional O-ring seals around the stem or with even further stem sealing we offer 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 can be used in may applications with a carbon steel body but is also available in exotic metallics for use in highly corrosive applications.

Top Works Drawings

Actuation Torques

Installation, Maintenance and General Guidance PDF

Dimensions 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 mm mm mm mm
1/2″ 15 108 152 121
3/4″ 20 117 152 121
1″ 25 127 178 122
1.1/2″ 40 165 229 140
2″ 50 178 305 160
3″ 80 203 457 190
4″ 100 229 762 229
6″ 150 267 G/O G/O