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P3000 Series
Users Manual
5-12
System Selector Valve
Before commencing disassembly of the selector valve, make a note of the tubing
connections to avoid problems during reassembly.
Disassembly
1. Disconnect nylon tubing from connectors (11).
2. Loosen set screws (1), and remove knob (2) from valve shaft (3).
3. Remove screws (13), and withdraw valve assembly from support bracket (12).
4. Remove screw (9), and lift off valve rotor (8), taking care not to lose O rings (7).
5. Withdraw shaft (3) from valve body (6), taking care not to lose bearings (5).
Cleaning & Inspection
The bearings (5) are sealed, and should not require maintenance.
Check O-rings and all sealing faces for signs of wear and/or damage.
If necessary, the valve body can be immersed in a solvent, but it must be thoroughly
cleaned and dry before reassembly.
Re-Assembly
Reassembly is the reverse of removal. Care must be taken to ensure that the components
are located correctly, in particular:
• The relationship between the pins (4) in the valve shaft (3) and the valve body (6),
which limit rotation.
• The orientation of the grooves on valve rotor (8) and the pin (4) in the valve shaft
(3). These grooves align with the spring plunger (14) in the support bracket (12)
when fully assembled, and ensure correct valve operation.
• The orientation of the knob (2), as the “P-V” label on the front should be the
correct way up when fully assembled.
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