Samson EB 8111 EN, Mounting And Operating Instructions

Page: 43 / 72

EB 8111/8112 EN 9-5
Servicing
To remove a pneumatic actuator with "stem
extends" fail-safe action and/or with pre-
loaded springs, a certain signal pressure
must be applied to the actuator (see associ-
ated actuator documentation). Afterwards,
the signal pressure must be removed and the
air supply disconnected again and locked.
We recommend removing the valve from the
pipeline before performing any service work
(see the 'Removal' section).
The following service work can be per-
formed after preparation is completed:
− Replace the gaskets as described in sec-
tion 9.4.1.
− Replace the packing (see section 9.4.2)
− Replace the seat and plug (see sec-
tion 9.4.3)
9.3 Mounting the valve after
service work
1. Mount actuator. See associated actuator
documentation and in the 'Installation'
section.
To fasten the actuator (form B) onto the
valve, the central nut (98) must be tightened.
Observe tightening torques.
2. Adjust lower or upper signal bench
range. See associated actuator docu-
mentation.
3. If the valve has been removed, re-install
the valve into the pipeline (see the 'Instal-
lation' section).
4. Put the control valve back into operation
(see the 'Start-up' section). Make sure the
requirements and conditions for start-up
or putting the valve back into operation
are met.
9.4 Service work
Î
Before performing any service work,
preparations must be made to the control
valve (see section 9.2).
Î
After all service work is completed, check
the control valve before putting it back
into operation (see 'Testing the installed
valve' in the 'Installation' section).
Note
Tip
Note