4 - 10 Maintenance and Repair
4.8 Inlet and Purge Exhaust
Switching Valve Maintenance

(LS1000)

WARNING!
Ensure that the Dryer is de-energized, valve isolated,
and fully depressurized before attempting to remove
or disassemble any Dryer component or subassem-
bly. Failure to do so may result in serious personal
injury and/or equipment damage.
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 [1].
3. Apply an ultra-thin film of O-ring lubricant to items [14],
[16], [17], and [21] before reassembly.
4. The U-cup piston seal [16] has been fitted with a cut
O-ring. Ensure that the U-cup piston seal is installed
on the valve pistons [4] and [5] as shown in Figure 4.3.
5. Apply a light coat of lubricant to the sockethead cap
screws, items (1) and (18). Hand tighten screws until
snug. Torque as follows:
Torque 1/4 - 20 screws to 40 in-lbs.
Torque 5/16 - 18 screws to 135 in-lbs.
Figure 4.5
Switching Valve Components
Item Description Total
1 Valve Body 1
2 Valve Cover (Left Side) 1
3 Valve Cover (Right Side) 1
4 Valve Piston (Inlet) 2
5 Valve Piston (Purge Exhaust) 2
6 Valve Poppet (Purge Exhaust) 2
7 Connect Rod 1
8 Centering Rod 1
9 Spacer 1
10 Backup Ring 2
11 Compression Spring (Inlet) 2
12 Compression Spring (Purge Exhaust) 2
13 Washer 2
14 O-Ring (Valve Cover) 4
15 Tetraseal 3
16 Piston Seal 8
17 O-Ring (Inlet) 4
18 Sockethead Cap Screw 12
19 Locknut 2
20 Shaft 2
21 O-Ring (Shaft) 2
22 Pin 2
Piston seal [16] orientation
on inlet valve piston [4].
Typical both sides.
Piston seal [16] orientation on
purge exhaust valve piston [5].
Typical both sides.