GEA VARIVENT A, Перевод оригинальной инструкции по эксплуатации

Страница: 43 / 74

43
Maintenance
Checking the Function
Dismantling the Actuator Housing Cover
Requirement:

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.
WARNING
Spring tension in the valve
Danger of injury when opening the housing cover as the released spring pretension will
suddenly lift the housing cover.

Therefore never slacken all the screws of the housing cover at the same time.
Carry out the following steps:
1.
Remove the hex nuts (1) of the short screws.
2.
Slacken the hex nuts of the long screws slowly and at evenly distributed points along
the circumference so that the two housing parts drift apart and the spring pretension
is reduced.

Done
Checking the Function
Setting the Stroke
Carry out the following steps:
1.
Actuate the valve with compressed air.
2.
Set the stroke in accordance with the “Valve Stroke Table“ (page 44).

Done