Use the following steps as a guideline for the selection
of materials:
1. Determine the pressure/temperature rating of the
valve body size and material required. Inlet pressure
and temperature must always be limited by the
applicable ASME pressure/temperature rating.
2. Select the desired trim style from the Available
Configurations specification and from table 4, Shutoff
Classifications.
3. Select desired materials from tables 7, 8, 11, and 12
and figure 12. The temperature capabilities
determined from figure 12 may be further limited by
the temperature capabilities of materials selected
from tables 7 and 12. Refer to figure 12 to determine
pressure drop limits of the valve body-trim
combinations selected.