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Maintenance and Repair
4.8
3" Inlet Switching Valve
Maintenance
(Models OP250 and OP300)
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 [21] from the dryer manifold
is not required unless replacement of O-rings [23] or valve
body is necessary.
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 [21]. As previously noted, this can be accom-
plished without removing the valve body [9] from the
dryer manifold.
3.
Apply an ultra-thin film of O-ring lubricant to items [3],
[6], [8], [12], [14] and [23] before reassembly.
4.
Apply a light coat of lubricant to the sockethead cap
screws, items (1), (20) and (22). Hand tighten screws
until snug. Torque items (1) and (20) to 20 ft-lbs, and
item (22) to 45 ft-lbs.
3" Switching Valve Components
Item
Description
Total
1
Sockethead Cap Screw
4
2
Valve Cover
1
3
O-Ring
1
4
Bonnet Cylinder
1
5
Locknut
1
6
Piston Seal
1
7
Valve Piston
1
8
O-Ring
3
9
Poppet Shaft
1
10
Rod Seal
4
11
Guide Sleeve
2
12
O-Ring
1
13
Valve Bonnet
1
14
O-Ring
2
15
Rod Scraper
2
16
Valve Poppet
2
17
Poppet Shaft
1
18
Poppet Shaft
1
19
Valve Bonnet
1
20
Sockethead Cap Screw
4
21
Valve Body
1
22
Sockethead Cap Screw
4
23
O-Ring
2
