User Guide

AV-395 or AV-396 on Obsolete 2-1/2" to 4" VB-9X13 Valve Bodies

See Figure-4 and YBA-651-1 & YBA-652, Valve Packing Kits General Instructions,

F-24185 for details.

Caution:

Before the packing nut is removed, the system pressure on the valve must be

reduced to zero (0) psig. If the packing nut is removed while there is pressure on the valve,

the packing can blow out of the valve.

1. Mount the bracket onto the valve body as follows:

a. Remove the packing nut and the bracket nut.

b. Place the bracket onto the valve body.

c. Replace and tighten the valve bracket nut.

d. Replace the packing nut.

Figure-4 Valve Linkage for Obsolete 2-1/2" to 4" VB-9X13 Valve Bodies.

The following steps are common to all AV-390 valve linkages. Proceed with step 2 after

completing step 1 for the selected linkage.

2. Thread the stem lock nut and stem extension down fully onto the valve stem.

3. Place the actuator onto the mounting bracket. Fasten the actuator to the mounting

bracket with the three 1/4 - 20 screws. Do not tighten the screws.

4. Place the nylon bushing onto the actuator shaft. (MA-31X and MA-41X actuators

require that a “C” ring be installed into the groove on the actuator shaft before placing

the nylon bushing onto the shaft.)

5. Position the actuator to the 3:00 (CW) or 9:00 (CCW) position so that the plunger cam

is pointing down. Use Figure-5 and Table-4Table-5 to determine whether the 3:00 (CW)

or 9:00 (CCW) position is the correct one for the plunger cam to be pointing down for

the application.

Figure-5 Actuator Shaft Position (Front View).

If any of the old style packing

components (no longer

available) require replacement,

replace the entire assembly

with the current YBA-652. The

old style bonnet assembly can

easily be identified by noting the

large hex head packing gland

nut with internal threads.