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Maintenance and Repair
4.10
3" Purge Exhaust
Switching Valve Maintenance
(Model OP300 only)
WARNING!
Ensure that the dryer is de-energized, valve isolated,
and fully depressurized before attempting to remove
or disassemble any dryer component or subassembly.
Failure to do so may result in serious personal injury
and/or equipment damage.
Note: Removal of valve body [18] from the dryer manifold
is not required unless replacement of O-rings [19] or valve
body is necessary.
Note: Exploded view illustrates one-half of exhaust switch-
ing valve only. Disassembly of opposite half (not shown
exploded), is identical.
1.
Clean and inspect all valve hardware upon disassem-
bly. Replace all software and any hardware which ap-
pears damaged or abnormally worn.
2.
Clean and inspect valve seat located inside the valve
body [18]. As previously noted, this can be accom-
plished without removing the valve body [18] from the
dryer manifold.
3.
Apply an ultra-thin film of O-ring lubricant to items [3],
[6], [8], [12], [14] and [19] before reassembly.
4.
Apply a light coat of lubricant to the sockethead cap
screws, items (1) and (20). Hand tighten screws until
snug. Torque item (1) to 20 ft-lbs, and item (20) to
45 ft-lbs.
3" Switching Valve Components
Item
Description
Total
1
Sockethead Cap Screw
8
2
Valve Cover
2
3
O-Ring
2
4
Bonnet Cylinder
2
5
Locknut
2
6
Piston Seal
2
7
Valve Piston
2
8
O-Ring
4
9
Poppet Shaft
2
10
Rod Seal
4
11
Guide Sleeve
2
12
O-Ring
2
13
Valve Bonnet
2
14
O-Ring
2
15
Rod Scraper
2
16
Valve Poppet
2
17
Machined Bolt
2
18
Valve Body
1
19
O-Ring
2
20
Sockethead Cap Screw
4
