User Guide

ManualsBrandsBarber Colman ManualsHVAC Replacement Parts1" NPT Two-Way Valve (10 cv)

TAC

1354 Clifford Avenue

P. O. Box 2940

Loves Park, IL 61132-2940

www.tac.com

Application

VB-7223 series single seat, stem up closed, 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. A large

selection of factory assembled combinations is

available. Consult the TAC Valve Products Catalog,

F-27384.

Danger:

Do not use for combustible gas applications.

The VB-7223 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 2"

• 250 psig pressure rating per ANSI Standards

(B16.15–1985) for screwed cast bronze bodies

• Spring-loaded TFE packing

• American Standard Taper Pipe Thread (NPT)

connections

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-7223 Series

1/2" to 2" Screwed NPT

Stem Up Closed (Normally Closed)

Two-Way Valves

General Instructions

Summary of content (12 pages)

PAGE 1
VB-7223 Series TAC 1354 Clifford Avenue P. O. Box 2940 Loves Park, IL 61132-2940 www.tac.com 1/2" to 2" Screwed NPT Stem Up Closed (Normally Closed) Two-Way Valves General Instructions Application VB-7223 series single seat, stem up closed, 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.
PAGE 2
SPECIFICATIONS Table-1 Specifications/Models.
PAGE 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 spring return position of valve assemblies. Table-2 Required Compatible Actuators/Linkages.
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-7223 series valves. Table-3 Rangeability.
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) 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 is the inlet and “AB” port is the outlet).
PAGE 9
Right Wrong Pipe threads too long. Pipe interferes with seat. Figure-3 Normal Thread Engagement. Valve Assembly Tighten pipe using this pipe wrench. Use pipe wrench to prevent valve from turning. Figure-4 Installation of Screwed End Valves. F-26073-1 © Copyright 2006 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 the valve was twisted or crushed during installation or that the 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-7223 Series Valves (Figure-5).
PAGE 12
Copyright 2006, TAC All brand names, trademarks and registered trademarks are the property of their respective owners. Information contained within this document is subject to change without notice. TAC 1354 Clifford Avenue P.O. Box 2940 Loves Park, IL 61132-2940 F-26073-1 www.tac.