User Guide

ManualsBrandsBarber Colman ManualsHVAC Replacement Parts3/4" NPT Two-Way Valve (7.5 cv)

Application

VB-7263 series single seat, stem up to close, two-way

valves control water from 20 to 340°F (-7 to 171°C)

or steam to 340°F (171°C) max. in heating or air

conditioning systems. These valves have stainless

steel trim with a Teflon

disc. 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-7263 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)

• Spring-loaded TFE packing

• American Standard Taper Pipe Thread (NPT)

connections

• Stainless steel seat and Teflon disc

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-7263 Series

1/2" to 2" Screwed NPT

Stainless Steel Trim with Teflon Disc

Stem Up Closed, Two-Way Valves

General Instructions

Summary of content (12 pages)

PAGE 1
VB-7263 Series 1/2" to 2" Screwed NPT Stainless Steel Trim with Teflon Disc Stem Up Closed, Two-Way Valves General Instructions Application VB-7263 series single seat, stem up to close, two-way valves control water from 20 to 340°F (-7 to 171°C) or steam to 340°F (171°C) max. in heating or air conditioning systems. These valves have stainless steel trim with a Teflon® disc. They are used for twoposition or proportional control applications.
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 normal 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-7263 series valves. Table-3 Rangeability.
PAGE 5
recommended pressure drop of 5 psi (34 kPa). When the design temperature drop is less than 60°F (33°C) for conventional heating systems, higher pressure drops across the valve are needed for good results (Table-4). Table-4 Conventional Heating System.
PAGE 6
Table-6 Steam Capacity in Pounds Per Hour for VB-7263 Series. Differential Pressure (ΔP in psi) a Valve Body Part Number Cv Rating VB-7263-0-4-1 0.4 VB-7263-0-4-2 1.3 VB-7263-0-4-3 2.2 12 32 VB-7263-0-4-4 4.4 24 65 VB-7263-0-4-5 5.5 30 81 VB-7263-0-4-6 7.5 41 VB-7263-0-4-7 10 55 VB-7263-0-4-8 12 VB-7263-0-4-9 20 VB-7263-0-4-10 28 VB-7263-0-4-11 40 Valve Body Part Number Cv Rating 2 psig Inlet 5 psig Inlet 10 psig Inlet 15 psig Inlet 20 psig Inlet 25 psig Inlet 0.2 1.
PAGE 7
Note: Add 14.7 psi to gauge supply pressure to obtain absolute pressure value. 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 8
5. Apply pipe dope sparingly to all but the last two threads of a properly threaded, reamed, and cleaned pipe. Make sure that pipe chips, scale, etc. do not get into the pipe since this material may lodge in the valve seat and prevent proper closing and opening of the valve. 6. Start the joint by hand screwing the pipe into the valve. If the thread engagement feels “right,” turn the pipe by hand as far as it will go. 7. Use a pipe wrench to fully tighten the valve to the pipe.
PAGE 9
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.
PAGE 10
DIMENSIONAL DATA Table-10 Dimensions for VB-7263 Series Valves (Figure-5).
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-24389-2 TAC 1354 Clifford Avenue P.O. Box 2940 Loves Park, IL 61132-2940 www.tac.