WIKA CPP 7000-X, Руководство по эксплуатации, Страница: 20 / 60

6. Commissioning, operation
20 WIKA Operating Instruction, model CPP7000-X
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6.2.2
Decreasing the pressure
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Turn the spindle pump anticlockwise to release pressure in the system.
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If the pressure is close to the next test level, make the fine adjustment with the spindle pump.
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Once the spindle pump is turned back completely anticlockwise, only the initial pressure
remains in the system.
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Now the high-pressure shut-off valve can be opened.
WARNING!
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 anticlockwise.
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The initial pressure can be further relieved by carefully opening the low-pressure shut-off
valve.
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By completely opening the low-pressure shut-off valve, the initial pressure will completely
escape back into the tank.
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The system is now completely relieved.
WARNING!
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
anticlockwise. 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.
6.3 Disassembly
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After all pressure points have been recorded, ensure that the system is depressurised
(see chapter 6.2.2
Decreasing the pressure
).
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Now the device under test and the reference instrument can be removed from the test
connections.
DANGER!
Do not disconnect the device under test or the reference instrument until the
pressure in the comparison test pump has not been completely released.
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The handle bars of the star handle can now be unscrewed from the spindle pump.