User Guide

ManualsBrandsBarber Colman ManualsDiverting Valves3/4" NPT 3-Way Diverting Valve Body (7.5 cv)

Application

VB-7323 series three-way diverting valves control hot

or chilled water in heating or air conditioning systems.

These valves must be piped with one inlet and two

outlets. 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-7323 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 Water, F-11080

• EN-205 Water System Guidelines, F-26080

VB-7323 Series

1/2" to 2" Screwed NPT

Three-Way Diverting Valves

General Instructions

Summary of content (12 pages)

PAGE 1
VB-7323 Series 1/2" to 2" Screwed NPT Three-Way Diverting Valves General Instructions Application VB-7323 series three-way diverting valves control hot or chilled water in heating or air conditioning systems. These valves must be piped with one inlet and two outlets. 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.
PAGE 4
Rangeability Rangeability is the ratio of rated flow to the minimum controllable flow through a valve. For diverting valves, control begins as soon as plug displacement allows flow. Thus, three-way valve rangeability normally exceeds 500:1, which is the reciprocal of 0.2% nominal leakage. Temperature/Pressure Ratings See Figure-1 for temperature and pressure ratings. Consult the appropriate valve linkage general instruction sheet for the effect of valve body ambient temperatures on specific actuators.
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
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 7
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 screwed end valves with the “B” port as the inlet and ports “A” and “AB” as the outlets.
PAGE 8
Wrong Right Pipe threads too long. Pipe interferes with seat. Figure-2 Normal Thread Engagement. Valve Assembly Tighten pipe using this pipe wrench. Use pipe wrench to prevent valve from turning. Figure-3 Installation of Screwed End Valves. 8 © Copyright 2008 TAC All Rights Reserved.
PAGE 9
TYPICAL PIPING All piping must comply with local codes and ordinances. Refer to Figure-4 for typical piping. Heat Exchanger Valve A B Return A B Supply Figure-4 Typical Primary-Secondary Piping. 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.
PAGE 10
Water System Maintenance All heating and cooling systems are susceptible to valve and system problems caused by improper water treatment and system storage procedures. These guidelines are provided to help avoid valve and water system problems resulting from improperly treated water or storage procedures in cooling and hot water systems, and to obtain maximum life from TAC valves. Durability of valve stems and packings is dependent on maintaining non-damaging water conditions.
PAGE 12
Copyright 2008, 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. F-26076-2 TAC 1354 Clifford Avenue P.O. Box 2940 Loves Park, IL 61132-2940 www.tac.