Maintena nce
46
WBV.PU.002.EN VX215QD V2.0
8.1.3
Pressure valve
The pressure valve ensures a slight pressurisation of the buffer fluid. If the pressure rises too much (>1.5
bar) or there is a leak on the pump shaft seal, the leaking fluid (pump medium or gear oil) can escape via the
valve. A collecting tank can be connected if necessary.
Recommendation: to be able to monitor the buffer chamber pressure and the buffer fluid level, a buffer fluid
tank should be installed instead of the pressure valve.
Fig
. "Pump with pressure valve"
Dismount the pressure valve for inspection of buffer fluid in the buffer chamber and for topping up buffer
fluid.
Air buffer
When adding buffer fluid, leave a buffer of air above it (about 1 cm distance between the oil level and the
bearing seal housing)
Fig.
"Pump with pressure valve". The air buffer prevents the buffer chamber fluid
from escaping through the pressure valve due to thermal expansion.
1
Pressure valve
A
Air buffer
B
Oil level
Fig. 17: Pump with pressure valve
8.1.4
Plugs
The buffer chamber assembly with plugs is used only for special designs, for example submersible pumps.
Fig.
"Pump with pressure valve"
To add small quantities to the buffer chamber, dismount the upper plug (instead of pressure valve).
Air buffer
When adding buffer fluid, leave a buffer of air above it (about 1 cm distance between the oil level and the
bearing seal housing), see C
Fig.
"Pump with pressure valve". The air buffer prevents the buffer chamber
fluid from building up an unacceptably high pressure due to thermal expansion.
