WIKA CPB5000HP - Handbuch (Seite 18)

Pressure Balance High-Pressure GB
CPB 5000 HP
WIKA Operating Instructions Pressure Balance High-Pressure Version 2.3 18
3.2.5 Approaching the pressure value (decreasing pressure) .
Turn the spindle pump anticlockwise to release pressure in the system.
If the pressure is close to the next test level, make the fine adjustment with the spindle wheel.
Caution:
The piston is lowered very quickly just before equilibrium is achieved.
Caution:
Do not remove masses completely from the piston/cylinder system under
pressure.
Once the spindle pump is turned back completely counter-clockwise, only the initial pressure
remains in the system.
Now the high-pressure shut-off valve can be opened.
Open the high-pressure shut-off valve only if the pressure in the system has
been relieved to initial pressure. For this purpose, always first turn the spindle
pump back completely counter-clockwise.
The initial pressure can be further relieved by carefully opening the low-pressure shut-off valve.
By completely opening the low-pressure shut-off valve, the initial pressure will completely escape
back into the tank.
The system is now completely relieved
Even if you wish to relieve the system from a high pressure completely down to
zero immediately, the spindle pump must first be completely turned back
counter-clockwise. Then open the high-pressure shut-off valve, and
subsequently open the low-pressure shut-off valve. The initial pressure then
escapes completely into the tank. The system is now completely relieved.