Siemens KION Service Manual page 81

KION / KION-i
Checking mushroom valves
The check of the mushroom valves is made by
pressurizing a mushroom valve on one side and
check that no pressure is built-up on the other side.
Thereafter, the mushroom valve is opened and a
verification is made to check that the pressure is
equalized on both sides of the valve.
1. The mushroom valves test is performed one
valve at a time in the following order: MV1, MV2,
MV3, MV4, MV5, OV12 (OV12 is the one-way
valve inside the patient cassette).
2. All the mushroom valves are opened to empty
the system.
3. All mushroom valves are closed.
Pressurizing
4. The mushroom valve is first pressurized on one
side with a flow of 15 l/min to 10 cmH2O.
Thereafter with a flow of 5 l/min to a higher
pressure level.
• The gas used for pressurizing the mushroom
valve is dependent on which valve to be
tested, see the table below.
• If the pressure level is not reached within
27 s, the test will Fail. One of the mushroom
valves is leaking or not closing,
Diagnostic 275.
• The pressure level, and which pressure
transducer to be used, is dependent on the
valve to be tested, see table below:
Tested Pressure
valve cmH2O
MV1 INSP > 25
MV2 INSP > 25
MV3 INSP > 25
MV4 PEEP > 25
MV5 MAN > 15
OV12 INSP > 25
E382 E392E 061 01 02 02
Gas used Mushroom
valves open
during the test
Fresh gas None
Fresh gas None
Fresh gas None
Drive gas MV2
Drive gas MV1,MV2
Fresh gas None
Siemens-Elema AB
Leakage Test
5. The pressurizing flow is turned off.
6. To ensure that there is no leakage at the
mushroom valve, the pressure should not
increase on the other side of the valve.
• If there is an unacceptable pressure increase
on the other side of the mushroom valve, the
test will Fail. This indicates a leakage at one
of the mushroom valves. Diagnostic 276.
• Acceptable pressure increase, and which
pressure transducer to be used during the
test, is dependent on the valve to be tested,
see table below:
Tested Pressure
valve cmH2O
MV1 MAN < 10
MV2 PEEP < 10
MV3 PEEP < 10
MV4 INSP < 10
MV5 INSP < 10
OV12 MAN < 10
Opening Test
7. The mushroom valve to be tested is opened.
8. The pressure should now be equalized on both
sides of the mushroom valve.
• If the pressure is not equalized on both sides
of the mushroom valve, the test will Fail. The
tested mushroom valve is not opened or
there is a leakage at another mushroom valve
Diagnostic 277.
• Acceptable pressure equalization criteria is
dependent on the valve to be tested, see
table below:
Tested Pressure
valve cmH2O
MV1 MAN > INSP - 10
MV2 PEEP > INSP - 10
MV3 PEEP > INSP - 10
MV4 INSP > PEEP - 10
MV5 INSP > MAN - 10
OV12 INSP > 10 for 5 s
• The MV5 is opened when the OV12 valve is
tested. If there is a leakage in OV12, the gas
will flow into the manual breathing bag with a
pressure decrease as result.
9. The test is re-started from Step 1 when the next
mushroom valve is tested.
Service procedures
Mushroom
valves open
during the test
None
None
None
MV2
MV1,MV2
None
Mushroom
valves open
during the test
MV1
MV2
MV3
MV4
MV5
MV5, see below
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