User Guide

2 © Copyright 2008 TAC All Rights Reserved. F-24386-2
SPECIFICATIONS
*Maximum recommended differential pressure in open position. Do not exceed recommended differential pressure
(pressure drop) or integrity of parts may be affected. Exceeding maximum recommended differential pressure voids
product warranty.
**k
vs
= m
3
/h (ΔP = 100 kPa) C
v
= k
vs
x 1.156
Close-off Pressure Rating
The close-off pressure rating is dependent on the size of the valve, valve linkage, and
actuator. Consult the appropriate valve linkage general instruction sheet for the close-off
ratings.
Normal Position of Valve Assembly
For a valve assembly (valve, linkage, and actuator) to have a normal position, the actuator
must be of the spring return type. See Table-2 for spring return position of valve assemblies.
Flow Characteristics
All valves have 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 equal
percentage flow characteristics of VB-9223 series valve bodies.
Table-1 Specifications/Models.
Specifications
Valve Body Series
VB-9223-0-4-P
Valve Body Series
VB-9223-0-5-P
Service Chilled or Hot Water and Steam
Flow Characteristics (Figure-1) Equal Percentage
Sizes 2-1/2" and 3" 2-1/2" to 6"
Type of End Fitting Screwed NPT 125 lb. Flanged
Valve
Materials
Body Bronze Iron
Seat Bronze
Stem Stainless Steel
Plug Brass
Packing Spring-loaded TFE
Disc Composition
ANSI Pressure Class (Figure-2) 250 (up to 400 psig below 150°F)
125 lb. Flanged
(up to 200 psig below 150°F)
Maximum Inlet Pressure, Steam 35 psig (241 kPa)
Allowable Control Media Temperature 40 to 281°F (4 to 138°C)
Allowable Differential Pressure for Water*
35 psi (241 kPa) Max. for Normal Life
(refer to “Cavitation Limitations on Valve Pressure Drop” on page 6)
Allowable Differential Pressure for Steam* 20 psi (138 kPa)
Temperature Limits of Controlled Media in Valve 40 to 281°F (4 to 138°C) 40 to 281°F (4 to 138°C)
Valve Size C
v
Rating k
vs
Rating** Complete Valve Body Part Number
2-1/2"
56 48 Not Available VB-9223-0-5-12
65 56 VB-9223-0-4-12 Not Available
3" 85 73 VB-9223-0-4-13 VB-9223-0-5-13
4" 145 125
Not Available
VB-9223-0-5-14
5" 235 203 VB-9223-0-5-15
6" 350 302 VB-9223-0-5-16
Table-2 Required Compatible Actuators/Linkages.
Actuator Series
Required Valve Linkage
Normal
Position
2-1/2" to 4"
Valves
5" & 6"
Valves
MK-6801, MK-6811, MK-6821 AV-495
—
Normally ClosedMK-8801, MK-8811, MK-8821 AV-496
MK-8901, MK-8911, MK-8921 — AV-496