WIKA CPP1200-X - Handbuch (Seite 20)

20 WIKA operating instructions model CPP1200-X
GB
14076968.01 12/2013 GB/D
4. Design and function
Reservoir
Valve A
Hand pump
Valve B
4.4 Function
Operation of the comparison test pump is controlled by the two valves A and B on
the top of the reservoir/high pressure cylinder block. When initially priming the system
valves A and B are opened to fill the system with oil from the reservoir. Valve B is then
closed with valve A left open and the spindle pump operated to provide the lower test
pressures. To provide the higher pressures valve A is closed to seal off the test circuit
from the low pressure part of the spindle pump and valve B is opened to allow the liquid
in the low pressure part of the spindle pump to return to the reservoir as the pump
is operated. This ensures that the pump can be operated without having to put large
forces on the spindle pump handwheel. To release the test pressure the spindle pump is
wound out and valve A is opened.