User Guide

ManualsBrandsBarber Colman ManualsDiverting Valves5/8" O.D Flare 3-Way Diverting Valve Body (2.2 cv)

TAC

1354 Clifford Avenue

P. O. Box 2940

Loves Park, IL 61132-2940

www.tac.com

Application

VB-7332 series three-way sequencing valves control

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

heating or air conditioning systems. With the stem in

mid-stroke both inlet ports are closed, with the stem up

there is flow “B” to “AB,” and with the stem down there

is flow “A” to “AB.” These valves are used for

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-7332 series valve packings are not rated for

combustible gas applications, and if used in these

applications, gas leaks and explosions could result.

Features

• 250 psig pressure rating per ANSI Standards

(B16.15–1985) for cast bronze bodies

• Spring-loaded TFE packing

• 5/8" O.D., 45° SAE flared end fittings

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-7332 Series

5/8" O.D., 45° SAE Flared

Three-Way Sequencing Valves

General Instructions

Summary of content (8 pages)

PAGE 1
VB-7332 Series TAC 1354 Clifford Avenue P. O. Box 2940 Loves Park, IL 61132-2940 www.tac.com 5/8" O.D., 45° SAE Flared Three-Way Sequencing Valves General Instructions Application VB-7332 series three-way sequencing valves control hot or chilled water from 20 to 281°F (-7 to 138°C) in heating or air conditioning systems. With the stem in mid-stroke both inlet ports are closed, with the stem up there is flow “B” to “AB,” and with the stem down there is flow “A” to “AB.
PAGE 2
SPECIFICATIONS Table-1 Specifications/Models. Valve Body Series VB-7332-0-4-P Specifications Service Chilled or Hot Water Flow Characteristics (Figure-1) Sequencing Size 5/8" O.D.
PAGE 3
Flow Characteristics See Figure-1 for typical flow characteristics of VB-7332 series three-way sequencing valve bodies. 100 % of Maximum Flow Flow "B" to "AB" Flow "A" to "AB" 50 0 Stem Down Mid-Stroke % of Rated Stroke Stem Up Figure-1 Typical Flow Characteristics. 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 4
VALVE SIZING AND SELECTION Water Proportional Proportional valves are usually selected to take a pressure drop equal to at least 50% of the “available pressure” (that is, the pump pressure differential available between supply and return mains with design flow at the valve location).
PAGE 5
For example, if a valve is controlling 200°F water at an inlet pressure of 18 psig, the maximum pressure drop allowable would be: Pm = 0.5 [(18 + 14.7) – 11.53] = 10.6 psi (Vapor pressure of 200°F water is 11.53 psia.) If the pressure drop for this valve is less than 10.6 psi, cavitation should not be a problem. Systems where cavitation is shown to be a problem can sometimes be redesigned to provide lower inlet velocities.
PAGE 6
TYPICAL PIPING All piping must comply with local codes and ordinances. Refer to Figure-3 and Figure-4 for typical piping. Valve Cold Water Supply A Normally open to hot water B A B Coil Hot Water Supply Return Figure-3 Typical Piping for Three-Pipe Single Coil. TK-1001 D.A.
PAGE 7
Chilled Water Return % Chilled Water Flow % Hot Water Flow % Hot Water Return % 100 80 60 Chilled Water Flow (Supply Valve Flow A to AB) 40 20 0 100 80 Chilled Water Return (Return Valve Flow AB to A) 60 40 20 0 100 80 60 Hot Water Flow (Supply Valve Flow B to AB) 40 20 0 100 80 Hot Water Return (Return Valve Flow AB to B) 60 40 20 0 0 2 4 6 8 10 12 14 16 18 20 Room Thermostat Branch Pressure Figure-5 Sequencing Valve Operation with Pneumatic Actuator. CHECKOUT 1.
PAGE 8
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.