WIKA CPP1600-X - Handbuch (Seite 12)

Comparison Test Pump GB
CPP 3000-X / CPP 5000-X / CPP 7000-X
WIKA Operating Instructions Comparison Test Pump Version 2.1 12
3.2.2 Reducing the 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.
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.
3.3 Disassembly
.
After all pressure points have been recorded, ensure that the system is depressurised (see section
3.2.2).
Now the test specimen and the reference instrument can be removed from the test connection.
Do not disconnect the test specimen or the reference instrument until the
pressure in the comparison test pump has been completely released.
The handle bars of the star handle can now be unscrewed from the spindle pump.