User Guide

ManualsBrandsBarber Colman ManualsHVAC Replacement Parts1/2" NPT 3-Way Mixing Valve

Table Of Contents

Application
- VB-7313 series three-way mixing valves control hot or chilled water in heating or air conditioning systems. These valves must be...
- Danger: Do not use for combustible gas applications. The VB-7313 series valve packings are not rated for combustible gas applications, and if used in these applications, gas leaks and explosions could result.
Features
Applicable Literature
SPECIFICATIONS
VALVE SIZING AND SELECTION
- Water
  - Table-3 Conventional Heating System.
    - Secondary Circuits with Small Booster Pumps
- Table-4 Water Capacity in Gallons Per Minute for VB-7313 Series.
  - Cavitation Limitations on Valve Pressure Drop
    - Table-5 Vapor Pressure of Water Table.
  - Additional Valve Sizing Information
INSTALLATION
TYPICAL PIPING
CHECKOUT
- 1. Make sure the valve stem operates smoothly before installing the valve linkage and the actuator.
- MAINTENANCE
  - Table-7 Maintenance Kits for VB-7313 Valves.
  - Water System Maintenance
DIMENSIONAL DATA

TAC

1354 Clifford Avenue

P. O. Box 2940

Loves Park, IL 61132-2940

www.tac.com

Application

VB-7313 series three-way mixing valves control hot or

chilled water 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-7313 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-27414

• TAC Electric-Electronic Products Catalog, F-27382

• TAC Pneumatic Products Catalog, F-27383

• CA-28 Control Valve Sizing, F-13755

• Valve Selection Chart for Water, F-11080

• EN-205 Water System Guidelines, F-26080

• Vx-7xxx-8xx, Vx-7xxx-59x, Vx-9xxx-8xx,

Vx-9xxx-59x Globe Valve Assemblies with TAC

DuraDrive Linear Series Actuators, F-26752

VB-7313 Series

1/2" to 2" Screwed NPT

Three-Way Mixing Valves

General Instructions

Summary of content (12 pages)

PAGE 1
VB-7313 Series TAC 1354 Clifford Avenue P. O. Box 2940 Loves Park, IL 61132-2940 www.tac.com 1/2" to 2" Screwed NPT Three-Way Mixing Valves General Instructions Application VB-7313 series three-way mixing valves control hot or chilled water 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.
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
Rangeability Rangeability is the ratio of rated flow to the minimum controllable flow through a valve. For mixing 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-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.
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
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. 8 © Copyright 2007 TAC All Rights Reserved.
PAGE 9
TYPICAL PIPING All piping must comply with local codes and ordinances. Refer to Figure-5 through Figure-7 for typical piping. Valve Valve Coil A Bypass A B B A B A B Return Return Bypass Coil Supply Supply Stem down flow through coil. Stem up flow through coil bypass. Stem up flow through coil. Stem down flow through coil bypass. Figure-5 Typical Piping for Control of Heating or Cooling Coil.
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-8 Dimensions for VB-7313 Series Valves (Figure-8).
PAGE 12
Copyright 2007, 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-26074-2 www.tac.