Data Sheet

EH and EHA Valves
D100042X012
Product Bulletin
51.2:EH
April 2015
18
Trim Selection Guidelines
for NPS 1-1/2 x 1 through 6
Globe Valves
Please refer to the following descriptions as a guideline
for the selection of appropriate trims:
n Trim 49--Trim 49 is the standard trim for C12A valve
body materials and should only be used with C12A
valve body materials. C12A should only be used
when the pressure and temperature capabilities for
WC9 valve body materials are not acceptable.
n Trim 50--Trim 50 is the standard trim for carbon
steel and alloy steel body materials and is
recommended for general and severe service
applications up to 427_C (800_F). Typical
applications for Trim 50 include services in water,
boiler feedwater, non-sour hydrocarbons, and
steam. The S41600 (416 stainless steel)
heat-treated plug and seat ring have a hardness
similar to CoCr-A (Alloy 6).
n Trim 53--Trim 53 should be used in all high
temperature applications between 427_C (800_F)
and 566_C (1050_F) unless chlorides are present.
The presence of chlorides could lead to stress
corrosion cracking of the CA28MWV (422 stainless
steel) cage.
n Trim 54--Trim 54 is the standard trim for stainless
steel body materials. It should be used where
hard-faced trim is specified.
n Trim 56--Trim 56 should be used for sour service.
n Trim 57--Trim 57 shall be used for boiler feedwater
service when limits exceed those specified for Trim
50.
Care should be taken when specifying this trim in small
sizes for applications where chlorides are present due
to stress corrosion cracking problems with S44004
(440C stainless steel).