4. Design and Function
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WIKA Operating Instruction, model CPP4000-X
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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.
