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Maintenance and Repair
4.9
2" Purge Exhaust
Switching Valve Maintenance
(Model OP250 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 [16] from the dryer manifold
is not required unless replacement of square O-rings [17]
or valve body is necessary.
Note: Exploded view illustrates one-half of switching 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 [16]. As previously noted, this can be accom-
plished without removing the valve body [16] from the
dryer manifold.
3.
Apply an ultra-thin film of O-ring lubricant to items [3],
[5], [8], [11], and [17] before reassembly. Do not ap-
ply lubricant to the valve seat seal [13].
4.
The U-cup piston seal [5] has been fitted with a cut O-
ring. Ensure that the U-cup piston seal is installed on
the valve piston [4] as shown. The open side of the U-
cup piston seal [5] must face the valve cover [2] upon
reassembly.
5.
Apply a light coat of lubricant to the sockethead cap
screws, items (1) and (18). Hand tighten screws until
snug. Torque to 245 in-lbs.
2" Switching Valve Components
Item
Description
Total
1
Sockethead Cap Screw
8
2
Valve Cover
2
3
O-Ring
4
4
Valve Piston
2
5
Piston Seal
2
6
Bonnet Cylinder
2
7
Valve Bonnet
2
8
O-Ring
2
9
Rod Scraper
2
10
Poppet Shaft
2
11
O-Ring
2
12
Seal Retainer
2
13
Valve Seat Seal
2
14
Retaining Disc
2
15
Seal Nut
2
16
Valve Body
1
17
Square O-Ring
2
18
Sockethead Cap Screw
4
