Technical Specifications

8 | GE Oil & Gas
Pressure/Temperature Ratings
Soft and Fire-Safe Seal
As temperature increases, the pressure retaining capability of
materials decreases. The graph below illustrates the pressure/
temperature ratings for ANSI Class 150, Class 300 and Class 600.
The heavy lines define the ratings of the carbon steel and stainless
steel valve body (or “shell”) in conformance to ANSI B16.34. The
shaded areas define the ratings of the PTFE and RTFE Seal materi-
als (Soft Seal).
Seal ratings are based on differential pressure with the disc in the
fully closed position.*
Steam Service (Soft Seal only)
PTFE sealed valves are rated for 50 psi saturated steam.
Valves with “O” seal configuration (RTFE seal/AFLAS O-ring) are
rated to 100 psi steam service.
ANSI B16.34 Body and Flowseal Soft Seat Pressure - Temperature Ratings
* Valves with 316SS shafts are rated for maximum pressure differentials of 150 psi for Class 150, 300 psi for Class 300, and 600 psi for
Class 600.