GEM 650TL Operating Instructions Manual page 38

18 Inspection and maintenance
Diaphragm is screwed in too far.
▶ Seal at the valve seat is not faultless.
▶ Function of the valve is no longer ensured.
Remove the diaphragm.
●
Check the valve and diaphragm.
●
Remount the diaphragm.
●
1. Move the actuator A to the closed position.
2. Mount the compressor (see "Mounting the compressor").
3. Ensure that the anti-twist system is engaged.
4. Check if the compressor is fitted in the guides.
5. Manually screw new diaphragm tightly into the com-
pressor.
6. Check if the diaphragm boss fits closely in the recess of
the compressor.
7. If it is difficult to screw it in, check the thread and replace
damaged parts.
8. When definitive resistance is felt, turn back the diaphragm
until its bolt holes are in correct alignment with the bolt
holes of the actuator.
9. Check the technical condition and function of the valve
prior to commissioning and during the total term of use.
10. Carry out checks regularly and determine the test intervals
in compliance with the conditions of use and/or the regu-
latory codes and provisions applicable for this application.
18.5.2 Mounting the convex diaphragm
Diaphragm face
Fig. 7: Inverting the diaphragm face
GEMÜ 650TL
NOTICE
Diaphragm pin
Adapter
Compressor
Diaphragm pin
Diaphragm face
Fig. 8: Screwing in the diaphragm face
Diaphragm is not screwed in far enough.
▶ The closing force is transmitted directly onto the dia-
phragm pin and not via the compressor.
▶ Damage and early failure of the diaphragm.
▶ Leakage of the valve.
Remove the diaphragm.
●
Check the valve and diaphragm.
●
Remount the diaphragm.
●
Diaphragm is screwed in too far.
▶ Seal at the valve seat is not faultless.
▶ Function of the valve is no longer ensured.
Remove the diaphragm.
●
Check the valve and diaphragm.
●
Remount the diaphragm.
●
1. Move the actuator A to the closed position.
2. Mount the compressor (see "Mounting the compressor").
3. Check if the compressor is fitted in the guides.
4. Invert the new diaphragm face manually (use a clean, pad-
ded mat with larger nominal sizes).
5. Position the new backing diaphragm onto the compressor.
6. Position the diaphragm face onto the backing diaphragm.
7. Screw diaphragm face tightly into the compressor manu-
ally.
ð The diaphragm boss must fit closely in the recess of
the compressor.
8. If it is difficult to screw it in, check the thread and replace
damaged parts.
9. When definitive resistance is felt, turn back the diaphragm
until its bolt holes are in correct alignment with the bolt
holes of the actuator.
38 / 42
Recess of compressor
Diaphragm boss
Backing diaphragm
NOTICE
NOTICE
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