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NOTE
Damage to the device when failing to observe tightening torque.
▶ Observe tightening torques.
→ Tighten each fastening screw in 3 stages (approx. 1/3, approx.
2/3, 3/3 of the tightening torque in accordance with "Tab. 5")
crosswise. The diaphragm should be positioned and pressed
evenly around the actuator and valve body.
7.3.2
Tightening torques
Nominal diameter
Diaphragm
DN
EPDM/FKM
(diaphragm size)
8
15
20
25
32
40
50
Tab. 5:
Tightening torques depending on diaphragm
* A tolerance of +10 % of the respective tightening torque applies to all values
20
Tightening torques [Nm]*
Diaphragm
PTFE/advanced
PTFE/Gylon®
2
2.5
3.5
4
4
4.5
5
6
6
8
8
10
12
15
english
Type 2933, 2934, 2935, 2973,
Installation
7.4
Set stroke limit
7.4.1
Set stroke limit, type 293x
Minimum stroke limit is available for type 2933, 2934 and 2935.
A hexagon nut is used for this purpose.
→ Turn the handwheel clockwise to move the valve to the closed
position.
→ Loosen the screw on the handwheel (hexagon socket, width
across flats 2) and remove handwheel.
Screw on handwheel
Fig. 13:
Set stroke limit type 293x
→ Screw hexagon nut down as far as it will go.
Minimum stroke is set.
→ Mount handwheel on actuator. The square on the spindle and
the hexagon of the nut must be in correct alignment with the
geometry in the handwheel so that they fit into each other.
2974, 2975
Square
Hexagon nut
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