Emergency Action - Samson 3241-1-Gas 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

Upon supply air or control signal failure, the
valve moves to its fail‑safe position (see 'De‑
sign and principle of operation' section).
Operators are responsible for emergency ac‑
tion 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
Defective bellows seal
Flange joint loose or
gasket worn out
Recommended action
Contact our after‑sales service.
Contact our after‑sales service.
Check the flange joint.
Replace gasket at the flanged joint (see the
'Servicing' section) or contact our after‑sales
service.
Putting the valve back into operation after
a malfunction
See the 'Start‑up' section.
EB 8020 EN