Cryogenic-Rotary Valve
Instruction Manual
Form 5482
February 2005
12
Figure 6. Anti-Blowout Protection Detail
PACKING
FLANGE
ANTI-BLOWOUT
FLANGE
SHAFT SHOULDER
SHAFT
HEX NUT
STUD
PACKING
FOLLOWER
HEX NUT
TYPICAL PTFE
V-RING
PACKING
A7090 / IL
SHAFT
STUD
HEX NUT
PACKING
FOLLOWER
V-RING PACKING
OUT’BD BEARING
PACKING RING
ANTI-BLOWOUT
SHAFT SHOULDER
3‐ THROUGH 12‐INCH SIZES 14‐ THROUGH 24‐INCH SIZES
16B5082 / DOC
appropriate for the valve size. If a vise or other
clamps are being used, make certain the flange
gasket sealing area of the valve body is not
damaged.
7. Manually rotate the drive shaft (key 4) to turn the
disc clockwise to meet the seal ring.
8. Place a piece of rubber, or other soft material,
between the disc and internal travel stop to protect
the disc. With a rubber mallet, tap the disc until it
contacts the internal travel stop. When the disc
makes contact with the stop, manually rotate the
disc counterclockwise back out of the seal ring to a
90-degree open position.
9. The final seating of the retaining ring screws can
now be done. For the screw torque values, refer to
table 5.
10. Repeat steps 7 and 8 two more times.
Note
When attaching the actuator to the
valve, make sure the valve disc is not
in contact with the internal travel stop.
The valve disc should be positioned
from 0.03 to 0.76 mm (0.001 to 0.030
inch) away from the internal stop in the
valve body.
CAUTION
When using an actuator, the actuator
travel stops or the actuator travel (for
actuators without adjustable stops)
must be adjusted so that the disc stop
in the valve body does not absorb the
output of the actuator. Failure to limit
actuator travel as described in the next
step can result in damage to the valve
shaft or other valve parts.
11. Use an appropriate tool (such as a feeler gauge)
and position the disc from 0.03 to 0.76 mm (0.001 to
0.030 inch) away from the internal stop in the valve
body.
This adjustment is necessary to be certain that the
actuator output torque is fully absorbed by the
actuator travel stop or by the actuator. The
internal travel stop in the valve body should not
absorb any of the actuator torque.
Anti-Blowout Protection, Packing,
Valve Shaft(s), Disc, and Bearing
Maintenance
Note
The 10- through 24-inch Class 150
valves and 8- through 24-inch Class
300 valves have a two-piece shaft. The
(12 Seiten)
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