Warning!
Spring tension in the valve (spring-to-close action)
Danger of injury when detaching the clamp connections (43, 46) as the
released spring pretension will suddenly lift the actuator.
► Therefore, release the spring tension before detaching the clamp
connections by pressurizing the actuator with compressed air at max. 6 or 7
bar (depending on the type of positioner) or by mechanically adjusting the
control cone.
Notice
Sensitive valve parts
Damage to valve parts.
► Protect the valve parts against impact stress.
► Do not put the valve insert down on the valve disk
► Work carefully when disassembling the valve.
Carry out the following steps:
1.
Pressurize the actuator (A) via connection (X) (spring-to-close action).
®
The valve opens, spring tension has been relieved.
2.
Remove the clamp connection (43.1) between the housing (401.1) and the
motor stool (9).
3.
Depressurize the actuator (A) and detach the air supply.
4.
Unscrew the coupling clips (6).
5.
Loosen the nut (76) and the adapter (10) and turn them downwards on the
valve disk (15).
6.
Remove the clamp connection (46), take off the actuator (A) and the motor
stool (9).
7.
Unscrew the nut (76) and adapter (10) from the valve disk (15).
8.
Detach the clamp connection (43.3) on the lower valve housing.
®
Sealing ring (1), bearing (2), sealing disk (3), bearing disk (4.1) and O-ring
(5) are accessible.
9.
On DN 25/1" OD, also unscrew valve disk (15.1) and O-ring (28) from valve
disk (15).
®
Done
10.5.4 Dismantling the Actuator Back Plate
Prerequisite:
•
Depending on the type and size of the control valve, prestressed actuators
can be fitted with a certain number of over-long screws. If this is not the case,
at least 2 opposite short screws must be replaced by long ones.
Maintenance
Disassembling the Valve
430BAL011074EN_5
08.11.2021
49
