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Design CAV4
Available Configurations and Valve Sizes
Common Characteristics: Four-stage Cavitrol IV
trim with soft metal-to-metal seats in Design CAV4
angle valve. Valve plug action is push-down-to-
close
Seal Ring Construction: J 2, J 3, J 4, or J 6 in.
valve with pressure-balanced valve plug and spring-
loaded PTFE seal ring. For use in low-temperature
applications
Stem-Balanced Construction: J 2 or J 4 in.
valve with stem-balanced valve plug (valve stem
diameter—for that portion of the stem that passes
through the bonnet—is equal to the nominal port
diameter). For use in high-temperature applications
Piston Ring Construction: 6 in. valve with pres-
sure-balanced valve plug and five graphite piston
rings. For use in high temperature applications
Maximum Inlet Pressure, Temperature, and Pres-
(1)
sure Drops
Consistent with ASME B16.34 Class 2500 pressure/
temperature ratings; but do not exceed the pres-
sure, temperature, and pressure drop conditions
specified when the valve was ordered. Also, see the
Installation section in this manual
End Connection Style
Buttwelding Ends: All buttwelding end schedules
per ASME B16.25 that are compatible with
ASME B16.34 valve body rating.
Raised-Face or Ring-Type Joint Flanged Ends:
Inlet connection is ANSI Class 2500 flange per
B16.5. Outlet connection mates to ANSI Class 2500
flange and has tapped bolt holes with line flange
studs
1. The pressure/temperature limits in this manual and any applicable standard or code limitation for the valve should not be exceeded.
flushing trim. Flushing trim consists of two plates
installed prior to system flushing in order to protect
Cavitrol IV trim and valve body gasket surfaces.
Earlier CAV4 control valves used hard metal-to-metal
seats. The soft metal-to-metal seated version can be
identified by the letters SMS stamped on the seat ring
(key 35, figure 10) or lower cage assembly (key 2, fig-
ure 10).
Specifications
Specifications for the Design CAV4 control valve are
shown in tables 1, 2, and 4.
2
Table 1. Specifications
Shutoff Classification
TSO (Tight Shutoff) Trim: Valves with TSO trim
are factory tested to a more stringent Fisher
Controls test requirement of no leakage at time of
shipment using ANSI/ISA Class V procedures.
Piston Ring Construction: Class IV per
ANSI/FCI 70-2
All Others: Class VI per ANSI/FCI 70-2
Flow Direction
In through the side connection and out the bottom
connection
Flow Characteristic
Linear
Port Diameters and Unbalance Area
See table 2, or table 3 for TSO trim
Minimum Seating Force
First refer to figure 2 to determine minimum seat
load in lbf per inch of port circumference, then multi-
ply that value by the port circumference from table
2, or table 3 for TSO trim
Valve Plug Travel
See table 2
Yoke Boss and Valve Stem Diameters
See table 2
Approximate Weights
See table 4
Installation
Personal injury or system damage
caused by sudden release of pressure
may result if the valve assembly is
installed where service conditions could
exceed the limits given in table 1 and on
the appropriate nameplates. To avoid
such injury or damage, use pressure-re-
lieving devices as required by applicable
industry codes to prevent the service
conditions from exceeding these limits.
WARNING
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