Cavitrol III Trims
D100196X012
Product Bulletin
80.2:030
March 2012
10
Figure 7. Pressure Drop/Temperature Capabilities
with Seal Ring (Cavitrol III Two- and Three-Stage
Trims)
NOTES:
FOR BOTH GLASS-FILLED AND GRAPHITE-FILLED PTFE AND
N10276 SEAL RING
FOR PEEK ANTI-EXTRUSION RING WITH GRAPHITE-FILLED PTFE
AND N10276 SEAL RING
3. DO NOT EXCEED 143 BAR (2160 PSI)WITH TWO-STAGE CAVITROL III CAGE.
4. PEEK REQUIRED FOR ALL BOILER FEEDWATER APPLICATIONS.
5. FOR STAINLESS STEEL PRESSURE BOUNDARY MATERIALS, CONTACT YOUR
EMERSON PROCESS MANAGEMENT SALES OFFICE.
1
2
2
1
A2963-1
Installation
Valve bodies with Cavitrol III trim must be installed so
that the flow direction is in through the cage openings
and out through the seat ring. This will be indicated by
an arrow on the valve body.
Exterior dimensions for ET and EWT valve bodies with
Cavitrol III one-stage trim and EHT valve bodies with
Cavitrol III trims do not change from their standard
trim constructions. For ET and EWT valve bodies with
Cavitrol III two-stage trims, see figure 8 and tables 6
and 7 for details of dimensions that change from
standard. For all other dimensions, refer to the
appropriate valve body bulletin.
Ordering Information
When ordering, specify:
Application Information
1. Processliquid–Stateparticlesizeandtypeof
entrained impurities, if any.
2. Specific gravity of liquid
3. Temperature and vapor pressure of liquid
4. Critical pressure
5. Range of flowing inlet pressures
6. Pressure drops
a. Range of flowing pressure drops
b. Maximum at shutoff
7. Flow rates
a. Minimum controlled flow
b. Normal flow
c. Maximum flow
8. Required C
v
9. Line size and schedule
Valve Body Information
To determine what information is needed for ordering
the valve body and trim, refer to the Specifications
section. Review the description at the right of each
specification or in the referenced tables, figures, and
bulletins, and indicate the desired choice wherever a
selection is to be made. Always specify the body
design being ordered as selected from table 1 or 3.
Actuator and Accessory Information
Select the specific actuator and accessories from the
appropriate bulletins. Typically piston actuators must
be used where the required valve plug travel is greater
than 102 mm (4 inches). Typically diaphragm
actuators may be used for 102 mm (4 inches) or less
required travel. Specify any additional ordering
information as required fromactuatororaccessory
bulletins.
If operating below minimum published C
v
s(seetables
2, 3, and 4), added trim reliability may be obtained
through use of low travel cutoff features available with
FIELDVUE™ digital valve controllers.
(2 pages)
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