User Guide

F-24394-2 © Copyright 2008 TAC All Rights Reserved. 3
Spring Return Position of Valve Assembly
For a valve assembly (valve, linkage, and actuator) to have a spring return position, the
actuator must be of the spring return type. See Table-2 for spring return position of valve
assemblies.
Table-2 Required Compatible Actuators/Linkages.
Flow Characteristics
Three-way mixing valves are designed so that the flow from either of the inlet ports to the
outlet is approximately linear, which means the total flow from the outlet is almost constant
over the stroke of the valve stem. See Figure-1 for typical flow characteristics of VB-7314
series valve bodies.
Figure-1 Typical Flow Characteristics.
Actuator Series Required Valve Linkage Spring Return Position
a
MA-318, MA-418, MA-419 AV-391 Stem Up or Down
MA-5210, MA-5211, MA-5213 AV-7600
b
Stem Up
MC-351, MC-431, MC-4311, MC5-4311 AV-393 None
MF-5413, MF-5513 AV-7600 & AV-601 Stem Up
MF-22203, MF-22303, MF-22323
Included w/Actuator None
MF-63103, MF-63123
MK-2690 AV-7400
Stem UpMK-4601, MK-4611, MK-4621 AV-401
MK-6601, MK-6611, MK-6621 AV-430
MM-400, MMR-400
AV-630 or
AV-630-10
None
MM-500, MMR-500 Stem Up or Down
MP-361, MP-461-600, MP-465, MP5-4651
AV-391
Stem Down
MP-371, MP-471-600, MP-475, MP5-4751 Stem Up
MP-381, MP-382, MP-481-600, MP-485,
MP-486, MP-4851, MP5-4851
AV-393 None
MP-5210, MP-5211, MP-5213 AV-7600
b
Stem UpMP-5410, MP-5411, MP-5413
AV-7600 & AV-601
MP-5511, MP-5513
MPR-5610, MPR-5611, MPR-5613
AV-7600 & AV-601 Stem Up
MPR-5713
MS-22353 Included w/Actuator None
a
Stem Up = Flow port “B” to port “AB”. Stem Down = Flow port “A” to port “AB.”
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.
Rated Flow
StrokeStem In
Stem Out
"A" Port
"B" Port
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0%
20% 40% 60% 80%
100%