Emergency Action - Samson 3351 Mounting And Operating Instructions

Malfunctions
Malfunction
The valve leaks to the
atmosphere (fugitive
emissions).
Note
Contact our after-sales service for malfunctions not listed in the table.

8.2 Emergency action

Plant operators are responsible for emergen-
cy action to be taken in the plant.
In the event of a valve malfunction:
1. Close the shut-off valves upstream and
downstream of the control valve to stop
the process medium from flowing
through the valve.
2. Perform troubleshooting (see sec-
tion 8.1).
3. Rectify those malfunctions that can be
remedied based on the instructions pro-
vided here. Contact our after-sales ser-
vice in all other cases.
8-2
Possible reasons
Defective packing
Diaphragm defective
Flanged joint loose or
gasket worn out
Recommended action
Replace packing (see the 'Servicing' section) or
contact our after-sales service.
Replace diaphragm (see the 'Servicing' section) or
contact our after-sales service.
Check the flanged joint.
Replace gasket at the flanged joint or contact our
after-sales service.
Putting the device back into operation after
a malfunction
See the 'Start-up' section.
EB 8039 EN