User Guide

ManualsBrandsBarber Colman ManualsHVAC Replacement Parts1-1/4" Normally Open Union Valve, 8-13 PSI (20 cv)

Application

VB-7211 series stem up open, two-way valves control

water from 20 to 281°F (-7 to 138°C) or steam to

281°F (138°C) maximum in heating or air conditioning

systems. They are used for two-position or proportional

control applications. Valve assemblies require an

actuator and a valve linkage that must be purchased

separately.

Danger:

Do not use for combustible gas applications.

The VB-7211 series valve packings are not rated for

combustible gas applications, and if used in these

applications, gas leaks and explosions could result.

Features

• Valve sizes 1/2" to 1-1/4"

• Equal percentage flow characteristics for two-

position or proportional control of water or steam

• 250 psig pressure rating per ANSI Standards

(B16.15–1985) for cast bronze bodies

• Spring-loaded TFE packing

• Union end American Standard Taper Pipe Thread

(NPT) connections

• Straightway or angle body pattern

Applicable Literature

• TAC Valve Products Catalog, F-27384

• TAC Cross-Reference Guide, F-23638

• TAC Reference Manual, F-21683

• TAC Application Manual, F-21335

• Control Valve Sizing, F-13755

• Valve Selection Chart for Steam, F-11366

• Valve Selection Chart for Water, F-11080

• EN-205 Water System Guidelines, F-26080

VB-7211-0-3-P

VB-7211-0-4-P

VB-7211 Series

1/2" to 1-1/4" Union End NPT

Stem Up Open, Two-Way Valves

General Instructions

Summary of content (12 pages)

PAGE 1
VB-7211 Series 1/2" to 1-1/4" Union End NPT Stem Up Open, Two-Way Valves General Instructions Application VB-7211 series stem up open, two-way valves control water from 20 to 281°F (-7 to 138°C) or steam to 281°F (138°C) maximum in heating or air conditioning systems. They are used for two-position or proportional control applications. Valve assemblies require an actuator and a valve linkage that must be purchased separately. Danger: Do not use for combustible gas applications.
PAGE 2
SPECIFICATIONS Table-1 Specifications/Models.
PAGE 3
Table-2 Required Compatible Actuators/Linkages Actuator Series Required Valve Linkage MA-5210, MA-5211, MA-5213 AV-7600 MF-5413, MF-5513 Spring Return Position a Stem Up Normally Open AV-7600 & AV-601 MF-22203, MF-22303, MF-22323 None (Non-Spring Return) Included w/Actuator MF-63103, MF-63123 MK-2690 AV-7400 MK-4601, MK-4611, MK-4621 AV-401 MP-5210, MP-5211, MP-5213 AV-7600a Stem Up Normally Open MP-5410, MP-5411, MP-5413 MP-5511, MP-5513 AV-7600 & AV-601 MPR-5610, MPR-5611, MPR-5613 MPR
PAGE 4
Rangeability Rangeability is the ratio of rated flow to the minimum controllable flow through a valve. Table-3 lists the rangeability for VB-7211 series of valves.
PAGE 5
VALVE SIZING AND SELECTION Water Two-position Two-position control valves are normally selected “line size” to keep pressure drop at a minimum. If it is desirable to reduce the valve below line size, then 10% of “available pressure” (that is, the pump pressure differential available between supply and return mains with design flow at the valve location) is normally used to select the valve.
PAGE 6
Steam Two-position Two-position zone valves and direct radiation valves are normally sized using a minimum of 10% of inlet pressure (psig). Proportional Proportional control valves are normally sized using: • For low pressure (15 psig or less), use ΔP of 80% of gauge inlet pressure. • For steam pressures greater than 15 psig, use ΔP of 42% of absolute (gauge plus 14.7 psig) inlet pressure. • When the Cv required is between two valve sizes, select the larger size.
PAGE 7
Cavitation Limitations on Valve Pressure Drop A valve selected with too high a pressure drop can cause erosion of discs and/or wire drawing of the seat. In addition, cavitation can cause noise, damage to the valve trim (and possibly the body), and choke the flow through the valve. Do not exceed the maximum differential pressure (pressure drop) for the valve selected.
PAGE 8
INSTALLATION Inspection Requirements Inspect the package for damage. If damaged, notify the appropriate carrier immediately. If undamaged, open the package and inspect the device for obvious damage. Return damaged products. • Tools (not provided): Pipe wrenches • Training: Installer must be a qualified, experienced technician • Appropriate accessories Caution: • Install the valve with the flow in the direction of the flow arrow (“A” port the inlet and “AB” port the outlet).
PAGE 9
Wrong Pipe threads too long. Pipe interferes with seat. Figure-3 Normal Thread Engagement. Valve Assembly Tighten pipe using this pipe wrench Valve Assembly Tighten pipe using this pipe wrench VB-7211-0-3-P VB-7211-0-4-P Use pipe wrench to prevent valve from turning Use pipe wrench to prevent valve from turning Figure-4 Installation of Union End Valves. F-24380-2 © Copyright 2008 TAC All Rights Reserved.
PAGE 10
CHECKOUT 1. Make sure the valve stem operates smoothly before installing the valve linkage and the actuator. 2. If the stem does not operate smoothly, it may indicate that valve was twisted or crushed during installation or that stem was bent by rough handling. These conditions may require that the valve be replaced. 3. After the piping is under pressure, check the valve body and the connections for leaks. 4. After the valve linkage and the actuator are installed, check their operation. a.
PAGE 11
DIMENSIONAL DATA Table-10 Dimensions for VB-7211-0-3-P Series Angle Valves (Figure-5).
PAGE 12
Table-11 Dimensions for VB-7211-0-4-P Series Straightway Valves (Figure-6).