User Guide

2 © Copyright 2008 TAC All Rights Reserved. F-24380-2
SPECIFICATIONS
Table-1 Specifications/Models.
Close-off Pressure Rating
The close-off pressure rating is dependent on the size of the valve, valve linkage, and the
actuator. Consult the TAC Valve Products Catalog, F-27384, for close-off ratings.
Spring Return 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 spring return position of valve
assemblies.
Specifications
Valve Body Series
VB-7211-0-3-P
Valve Body Series
VB-7211-0-4-P
Service Chilled or Hot Water and Steam
Flow Characteristics (Figure-1) Equal Percentage
Action Stem Up Open
Sizes 1/2" to 1-1/4"
Body Pattern Angle Straightway
Type of End Fitting Union NPT
Valve
Materials
Body Bronze
Seat Bronze
Stem Stainless Steel
Plug Brass
Packing Spring-loaded TFE
Disc EPDM
ANSI Pressure Class (Figure-2) 250 (up to 400 psig below 150°F)
a
a
Do not apply above pressure rating to piping system.
Maximum Inlet Pressure, Steam 35 psig (241 kPa)
Allowable Control Media Temperature 20 to 281°F (-7 to 138°C)
Allowable Differential Pressure for Water
b
b
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.
35 psi (241 kPa) Max. for Normal Life
(refer to “Cavitation Limitations on Valve Pressure Drop” on page 7)
Allowable Differential Pressure for Steam
b
20 psi (138 kPa)
Valve Size C
v
Rating k
vs
Rating
c
c
k
vs
= m
3
/h (ΔP = 100 kPa) C
v
= k
vs
x 1.156
Complete Valve Body Part Number
1/2"
0.4 0.3 VB-7211-0-3-1 VB-7211-0-4-1
1.3 1.1 VB-7211-0-3-2 VB-7211-0-4-2
2.2 1.9 VB-7211-0-3-3 VB-7211-0-4-3
4.4 3.8 — VB-7211-0-4-4
5.0 4.3 VB-7211-0-3-4 —
3/4"
5.5 4.7 VB-7211-0-3-5 VB-7211-0-4-5
7.5 6.5 — VB-7211-0-4-6
8.5 7.4 VB-7211-0-3-6 —
1"
10 8.6 — VB-7211-0-4-7
14 12 VB-7211-0-3-7 VB-7211-0-4-8
16 14 VB-7211-0-3-8 —
1-1/4"
20 17 — VB-7211-0-4-9
22 19 VB-7211-0-3-9 —