Burkert 2103 Manuel D'utilisation page 39

Type 2103, 2104, 2105
Replacement for control functions B and I
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Clamp the valve body in a holding product.
(applies only to valves not yet installed).
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Loosen the four body screws.
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Remove the actuator from the body.
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Unbutton or unscrew old diaphragm. If attachment is with a
bayonet catch, remove the diaphragm by rotating it through 90°.
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Install new diaphragm.
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Align diaphragm.
The marker flap of the diaphragm must be perpendicular to
the direction of flow (see "Fig. 40")!
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Place actuator back on the body.
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Lightly cross-tighten the body screws without pressurization until
the diaphragm is between the body and actuator.
Do not tighten screws yet.
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Pressurize pilot air port 1 of the actuator with compressed air
(5 bar) (see "Fig. 40").
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Actuate the diaphragm valve twice.
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Tighten the body screws to the permitted tightening torque (see
"Tab. 16: Tightening torques for diaphragms").
Repairs
Orifice DN Tightening torques for diaphragms [Nm]
(diaphragm
EPDM/FKM
size) [mm]
8 2.5
15 3.5
20 4
25 5
40 8
50 12
Tab. 16: Tightening torques for diaphragms
english
PTFE / advanced PTFE /
laminated advanced PTFE
2.5
4
4.5
6
10
15
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