User Guide

F-24390-2 © Copyright 2008 TAC All Rights Reserved. 3
Normal Position of Valve Assembly
For a valve assembly (valve, linkage, and actuator) to have a normal (spring return) position,
the actuator must be of the spring return type. See Table-2 for normal position of valve
assemblies.
Table-2 Required Compatible Actuators/Linkages.
Flow Characteristics
All valves have modified equal percentage flow characteristics. That is, for equal increments
of valve stem stroke, the change in flow rate with respect to valve stroke may be expressed
as a constant percent of the flow rate at the time of the change. The change of flow rate with
respect to valve stroke is relatively small when the valve plug is near the valve seat and
relatively high when the valve plug is nearly wide open. See Figure-1 for typical modified
equal percentage flow characteristics of VB-7273 series valve bodies.
Actuator Series Required Valve Linkage Normal Position
MA-318, MA-418, MA-419 AV-391 N.O. or N.C.
a
MA-5210, MA-5211, MA-5213 AV-7600
b
Normally Open
MC-351, MC-431, MC-4311, MC5-4311 AV-393 None
MF-5413, MF-5513 AV-7600
b
Normally Open
MF-22203, MF-22303, MF-22323
Included w/Actuator None
MF-63103, MF-63123
MK-2690 AV-7400
Normally OpenMK-4601, MK-4611, MK-4621 AV-401
MK-6601, MK-6611, MK-6621 —
MM-400, MMR-400
AV-630
None
MM-500, MMR-500 N.O. or N.C.
a
MP-361, MP-465, MP5-4651
AV-391
Normally Closed
MP-371, MP-475, MP5-4751 Normally Open
MP-381, MP-382, MP-485, MP-486,
MP-4851, MP5-4851
AV-393 None
MP-5210, MP-5211, MP-5213 AV-7600
b
Normally Open
MP-5410, MP-5411, MP-5413
AV-7600 & AV-601
MP-5513
MPR-5610, MPR-5611, MPR-5613
MPR-5713
MS-22353 Included w/Actuator None
a
Normal position dependent upon linkage installation. See linkage General Instructions.
b
High ambient temperatures with high media temperatures in the valve may require the use of AV-601 in addition
to AV-7600. See General Instructions for AV-7600 (F-26235) and AV-601 (F-19069) for details.