Mounting A Concave Diaphragm - Gemü 615 Betriebsanleitung

14 Inspection and maintenance
▶ If the diaphragm is not screwed into the adapter far
enough, the closing force is transmitted directly onto the
diaphragm pin and not via the compressor. This will
cause damage and early failure of the diaphragm and
thus leakage of the valve. If the diaphragm is screwed in
too far, perfect sealing at the valve seat will not be
achieved. The function of the valve is no longer ensured.
▶ An incorrectly mounted diaphragm may cause valve leak-
age/emission of medium. In this case, remove the dia-
phragm, check the complete valve and diaphragm and re-
assemble, proceeding as in the instructions above.
The compressor is loose.
Compressor - View from diaphragm side
Compressor, control function NO and DA
● Place the compressor loosely on the actuator spindle, fit
the wings into the guides (arrows).
GEMÜ 615
NOTICE
NOTICE
Anti-twist
system
Pin
Pin

14.2.3.2 Mounting a concave diaphragm

Recess of compressor
1. Move the actuator A to the closed position.
2. Place the compressor loosely on the actuator spindle, fit
the wings into the guides (see "General information"
chapter). Control function NO and DA: ensure that the pins
are engaged in the anti-twist system.
3. Check if the compressor fits closely in the guides.
4. Manually screw the new diaphragm into the compressor
tightly.
5. Check if the diaphragm boss fits closely in the recess of
the compressor.
6. If it is difficult to screw it in, check the thread, replace
damaged parts (only use genuine parts from GEMÜ).
7. When clear resistance is felt, turn back the diaphragm an-
ticlockwise until its bolt holes are in correct alignment
with the bolt holes of the actuator.
14.2.4 Mounting the actuator on the valve body
1. Move the actuator A to the open position.
2. Position the actuator A with the mounted diaphragm 2 on
the valve body 1, take care to align the compressor weir
and valve body weir (see sectional drawings).
3. Insert and tighten the bolts 18 with washers 19 by hand
(hand tight only).
4. Move the actuator A to the closed position.
5. Fully tighten the bolts 18 diagonally.
6. Ensure that the diaphragm 2 is compressed evenly (ap-
prox. 10-15 %, visible by an even bulge to the outside).
7. Check the tightness of the fully assembled valve.
▶ Service and maintenance:
Diaphragms set in the course of time. After valve disas-
sembly / assembly check that the bolts 18 on the body
are tight and retighten as necessary.
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Diaphragm pin
Diaphragm boss
NOTICE
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