bürkert 2301 Bedienungsanleitung Seite 39

Warning!
risk of injury from improper installation!
Assembly with unsuitable tools or non-observance of the tightening
torque is dangerous as the device may be damaged.
• Replacement only with special installation tools (for order numbers
refer to chapter entitled "Replacement parts/Installation tools")
• Observe the tightening torque (see following table "Tightening
torques of valve housing/nipples").
Procedure:
• First, remove the actuator and exchange the control cone.
• Now, with the valve housing being removed, replace the valve seat
as follows.
replacing the valve seat
→
Unscrew the old valve seat using the installation tools and a
spanner.
→
Clean the thread of the housing and the sealing surface with
compressed air.
→
Select the correct tool insert and screw it into the installation
tool.
→
Place the new valve seat onto the installation tool.
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Type 2301
Repairs
Warning!
danger if incorrect lubricants used!
Unsuitable lubricant may contaminate the medium. In oxygen
applications there is a risk of an explosion!
• In specific applications, e.g. oxygen or analysis applications, use
appropriately authorised lubricants only.
→
Grease the thread of the valve seat with stainless steel lubricant
(e.g. with Klüber paste UH1 96-402 from Klüber).
→
Manually screw the fitted valve seat into the thread of the
housing.
→
Screw the valve seat in place using a torque wrench. Observe
the tightening torque (see following table "Tightening torques for
valve seat installation").
tightening torques for valve seat installation
dn tightening torque [nm]
4 – 15 25 ±3
20 35 ±3
25 50 ±5
32 80 ±5
40 100 ±8
50 120 ±8
65 150 ±10