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14.3 Leakage
DRY adsorption dryers contain several NBR seals that seal the possible gaps between the
assembled parts. The most critical seals are O-rings between the blocks and the towers and
the control valve membranes that also have the function of the seals.
14.3.1 A leak between the block and the tower
A leak between the block and the tower can mostly be fixed by tightening the nutts on the
top of the dryer. If the leak is not fixed by the procedure then the O-rings need to be
replaced. Contact your supplier.
To replace the O-rings follow the procedure:
1. Disconnect the adsorption dryer from the compressed air system and the electrical
power.
1. Make certain that the adsorption dryer is depressurised. You can check this by
inspecting the pressure indicators at the top of the adsorption dryer. Picture (14.3)
2. Unscrew the nuts on the top of the upper block. Picture (14.4)
3. Unscrew the upper and lower screws at the sides of blocks beside the tower on
which you are replacing O-rings. Picture (14.5)
4. Slightly lift the upper block and take the tower out.
5. Remove the used O-rings and wipe any residual condensate and particles from the
blocks before replacing the O-rings.
6. Replace the O-ring seals into the grooves on the blocks.
7. Put the tower back into its position by lifting the upper block, screw the side screws
in.
8. Screw the nuts on the top tightly to ensure the proper sealing.
Tower 2 pressure indicator
(14.4)
(14.3)
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