10-7
85
88
93
88
87
80
109
117
51
83
50
83
52
122
61
1
21
55
20/22
123
124
rotation of the disc, marks provided on the end of the
shaft and on the lever arm should be aligned.
2. Bolt the actuator yoke to the valve body. Be certain
the stroke indicator plate is positioned properly to
accurately indicate the valve's rotation.
3. Position the actuator lever arm on the shaft so the
actuator stem is centered in the transfer case.
Firmly tighten the linkage bolt, on clamping lever
arm actuators.
CAUTION: On clamping lever-arm actuators,
do not apply air to the actuator without the
cover plate installed; otherwise, the unsup-
ported shaft may sustain damage.
4. Adjust the actuator stroke stop bolts until the disc is
parallel to the seat surface, but not resting on body
disk stop.
CAUTION: Actuator stroke stop bolts must be
properly adjusted to prevent the valve disc from
overstroking. If incorrectly adjusted the valve
shaft may be twisted or sheared off.
5. Install valve in line as outlined in
Installation section.
Figure 5: Exploded Body Sub-Assembly
NOTE: Item numbers correspond directly to the bill of material. Refer to it for specific part numbers.
Item No. Description
1
body
20
hard seat
21
seat insert
22
seat retainer
50
disk
51
shaft
52
taper pins
55
seat gasket
61
O-ring
80
gland flange
83
shaft bearing
85
packing retainer
87
packing follower
88
packing
93
packing spacer
109
packing box stud
117
packing box nut
122
shaft plug
123
clip
124
screw
body with the open ends of the snap-ring in the
body groove. Gently press the snap-ring into the
retainer until both the retainer and snap-ring slip
into the body. (Refer to Figure 1D.)
15. On early design Valdisk valves supplied with seat
retainer screws, install the insert and retainer into
the body with the disc open. Loosely install the
retainer screws, then close the disc. Tighten the
screws after the closed disc has centered the seat.
This allows the seat to align with the disc, permitting
tight shutoff.
Remounting Actuator to Valve
Before mounting a Valtek actuator on the valve body,
verify that the disc rotation matches the actuator rota-
tion and complies with the air failure requirements.
Procedure for mounting the actuator is as follows:
1. Slide the entire actuator assembly onto the shaft. If
necessary on Valtek actuator designs with clamp-
ing lever arm design, wedge the splined lever arm
apart to loosen it on the shaft splines. For full
