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13.4.2 Mounting the plug diaphragm
6
11
2
ü Actuator size 4/5: Press valve spindle 6 downwards to
screw in the plug diaphragm 2 completely.
1. Screw the plug diaphragm 2 to the valve spindle 6 and
hand-tighten it.
2. Place the distance piece 11 onto the valve body 1.
3. Place washers 17 and cap nuts 18 on stud bolts 16 and
position by hand.
4. Tighten cap nuts 18 diagonally (tightening torque: 16–
20 Nm).
13.5 Replacing the bypass valve actuator
13.5.1 Removing the actuator
1. Move the actuator to the open position.
2. Loosen fastening elements between the valve body and
the actuator diagonally and remove them.
3. Remove the actuator from the valve body.
4. Move the actuator to the closed position.
Important:
▶ After disassembly, clean all parts of contamination. Take
care not to damage the parts in the process. Afterwards,
check parts for potential damage. If parts are damaged,
replace them.
13.5.2 Removing the diaphragm
▶ Before removing the diaphragm, remove the actuator, see
previous chapter "Removing the actuator").
1. Pull out the diaphragm (diaphragm size 8).
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NOTICE
NOTICE
Important:
▶ After disassembly, clean all parts of contamination. Take
care not to damage the parts in the process. Afterwards,
check parts for potential damage. If parts are damaged,
replace them.
2. Use only genuine parts from GEMÜ.
13.5.3 Mounting the diaphragm
▶ Important: Mount the correct diaphragm that suits the
valve (suitable for medium, medium concentration, tem-
perature and pressure). The diaphragm is a wearing part.
Check the technical condition and function of the dia-
phragm valve before commissioning and during the
whole term of use. Carry out checks regularly and determ-
ine the check intervals in accordance with the conditions
of use and/or the regulatory codes and provisions applic-
able for this application.
▶ Important: Incorrectly mounted diaphragm may cause
valve leakage / emission of medium. In this case remove
the diaphragm, check the complete valve and diaphragm
and reassemble again proceeding as described above.
Diaphragm size 8:
Compressor and actuator flange seen from below:
Push-fit diaphragm:
1
2
Item
1
Recess of compressor
2
Diaphragm tab
47 / 54
13 Inspection and maintenance
NOTICE
NOTICE
NOTICE
Name
GEMÜ 567 BioStar control
2
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