Leaks At The Check Valve - maquet Betastar 1131 Wartungs- Und Reparaturanleitung

Test Instruction , Trouble Shooting
3.4

Leaks at the check valve (3)

It will be necessary to detach the "A" and "B" lines at the particular actuator cylinder to test for internal
leakage in the check valve (3).
Then connect the test adapter (4) from the tool kit (1130) together with the pressure gauge.
Press the "up" button.
1st step (I):
The pressure of 100 bar must not fall below 70 bar within a period of 30 min.
The presure will rise to the maximum (100 bar). Release the function control button; the check
valve closes.
Observe pressure characteristic "Y" (see diagram).
If the pressure falls abruptly by 10 - 30 bar (approx.) and then remains at a constant level, the test lead
must be bled and the test repeated.
2nd step (II):
Set pressure limiter valve DB 100 (or 120, 130) to 50 bar.
Pressure the "up" button, the pressure rises to a maximum value of 50 bar.
Release the button, the check valve closes.
The pressure of 50 bar must not fall below 35 bar within a period of 15 min.
Observe pressure characteristic "Z" (see diagram).
Tilt and Trendelenburg function of older models (before 09/89)
Check, if every single choke plate (X) is built in the tilt function (KB hollow screws with 0.3 mm orifice) and
Trendelenburg function (0.4 mm and 0.5 mm).
If necessary, replace missing nozzles (see hydraulic diagram).
9491.0354GB 02 10.06.2000
Hydraulic OR - tables
3.06
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