User Guide

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. Inadequate water treatment or filtration, not in accordance with chemical

supplier/ASHRAE handbook recommendations, can result in corrosion, scale, and abrasive

particle formation. Scale and particulates can result in stem and packing scratches and can

adversely affect packing life and other parts of the hydronic system.

To maintain non-damaging conditions, follow these guidelines:

• Clean the system prior to start up. Use a nitrite or molybdate-based treatment program.

• Use filtration equipment where needed.

• Properly store off-line systems and monitor water treatment results using corrosion test

coupons.

• Follow the advice of a water treatment professional.

• Consult EN-205, Water System Guidelines Engineering Information, F-26080, for

further details.

DIMENSIONAL DATA

Table-8 Dimensions for VB-7323 Series Valves (Figure-5).

Figure-5 Typical of VB-7323-0-4-P Valve Bodies.

Part

Number

Valve

Size

Dimensions in Inches (mm)

ABC

(Stem Down)

(Stroke)

VB-7323-0-4-4 1/2" 3-1/16 (78) 1-3/8 (35)

1-11/16 (43)

3/4 (19) 7/16 (11)

VB-7323-0-4-6 3/4" 3-5/8 (92) 1-11/16 (43)

VB-7323-0-4-8 1"

4-5/8 (118)

1-9/16 (40) 1-3/4 (45)

VB-7323-0-4-9 1-1/4" 1-5/8 (41) 2 (51)

VB-7323-0-4-10 1-1/2" 5-3/8 (137) 1-9/16 (40) 1-1/8 (29)

VB-7323-0-4-11 2" 6-1/8 (156) 1-7/8 (48) 1-3/16 (30)