© 2018 Valeport Ltd
Maintenance
Page 21
4.3. Replenishing Pressure Balance Fluid in Motor
Housing
The Motor housing for the water is pressure balanced using a liquid called Fluorinert FC-77. This is a
very inert, non-toxic fluid. It is very important that there are no significant air bubbles in this fluid,
since this will affect the pressure balancing of the housing, and may result in damage.
If there are air bubbles present, lay the housing horizontal, and position it such that the air bubbles
are directly beneath the bleed screw shown.
Remove the bleed screw, and using the syringe supplied, fill the housing with Fluorinert (approx
200ml are supplied for this purpose).
When the housing is full, refit the bleed screw and tighten.
