User Guide

ManualsBrandsBarber Colman ManualsHVAC Replacement Parts3/4" Union Sweat 3-Way Mixing Valve (7.5 cv)

Application

VB-7314 series three-way mixing valves control hot or

chilled water from 20 to 281°F (-7 to 138°C) in heating

or air conditioning systems. These valves must be

piped with two inlets (“A” and “B” ports) and one outlet

(“AB” port). 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-7314 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

• Union sweat end 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-7314 Series

1/2" to 2" Union Sweat, Solder Joint

Three-Way Mixing Valves

General Instructions

Summary of content (12 pages)

PAGE 1
VB-7314 Series 1/2" to 2" Union Sweat, Solder Joint Three-Way Mixing Valves General Instructions Application VB-7314 series three-way mixing valves control hot or chilled water from 20 to 281°F (-7 to 138°C) in heating or air conditioning systems. These valves must be piped with two inlets (“A” and “B” ports) and one outlet (“AB” port). They are used for two-position or proportional control applications. Valve assemblies require an actuator and a valve linkage that must be purchased separately.
PAGE 2
SPECIFICATIONS Table-1 Specifications/Models.
PAGE 3
Spring Return Position of Valve Assembly For a valve assembly (valve, linkage, and actuator) to have a 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
Temperature/Pressure Ratings of Valve Caution: Do not apply at static pressures greater than the pressure rating of the piping system. See Figure-2 for temperature and pressure ratings. Consult the appropriate valve linkage general instruction sheet for the effect of valve body ambient temperatures on specific actuators. Ratings conform with published values and disclaimer. VB-7314-0-4-P (Screwed Cast Bronze Body) Standards: Pressure to ANSI B16.
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 valve with the flow in the direction of the flow arrows (“A” and “B” ports are inlets and “AB” port is the outlet).
PAGE 8
TYPICAL PIPING All piping must comply with local codes and ordinances. Refer to Figure-3 through Figure-5 for typical piping. Valve Valve Coil A Bypass A B B A A B B Return Return Bypass Coil Supply Supply Stem up flow through coil. Stem down flow through coil bypass. Stem down flow through coil. Stem up flow through coil bypass. Figure-3 Typical Piping for Control of Heating or Cooling Coil.
PAGE 9
CHECKOUT 1. Make sure the valve stem operates freely before installing the valve linkage and the actuator. 2. If the stem does not operate freely, 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 10
DIMENSIONAL DATA Table-7 Dimensions for VB-7314 Series Valves (Figure-6).
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-24394-2 TAC 1354 Clifford Avenue P.O. Box 2940 Loves Park, IL 61132-2940 www.tac.