User Guide

CHECKOUT

1. Make sure the valve stem operates smoothly before installing the valve linkage and the

actuator. Initial breakaway force can be expected.

2. If the stem does not operate smoothly, it may indicate that the valve stem was bent by

rough handling. These conditions may require valve replacement.

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. Drive the actuator and run the valve to the stem down position. Make sure the

linkage and valve stem move freely. Consult Figure-3 (mixing) or Figure-4

(diverting) for proper flow in the stem down position.

b. Drive the actuator and valve to the stem up position. Again, the valve stem and

linkage should operate smoothly. Consult Figure-3 (mixing) or Figure-4 (diverting)

for proper flow in the stem up position. After the valve linkage and the actuator are

installed, check their operation.

Return

Supply

From

Other

Zones

Balancing

Cock

Balancing

Cock

To Othe

Zones

Secondary

Pump

Coil

Note: A label on the side

of the valve provides

port identification

Figure-8 VB-8303 Typical Primary-Secondary Piping