Samson 3351 - Function Testing

6-2 EB 8039 EN
Start-up
2. Slowly open the shut-off valves in the
pipeline. Slowly opening these valves
prevents a sudden surge in pressure and
highowvelocitieswhichcandamage
the valve.
Opentheshut-offvalvesrstontheup-
stream pressure side (upstream of the
valve). Afterwards, open all the valves
on the consumer side (downstream of the
valve).
3. Checkthevalvetoensureitfunctions
properly.
6.2 Function testing
Fail-close version
− The valve must be completely closed at a
controlpressureof0bar.
− Thevalvemuststarttoopenat3barat
the latest.
− The valve must be completely open at
6bar.
Fail-open version
− The valve must still be open at 0.5 bar.
− The valve must be completely closed at
4.5bar.
Control pressure and max. differential
pressureΔp
The'Controlpressureandmax.differential
pressureΔp
max
' table in the 'Design and
principle of operation' section shows the cor-
relation between control pressure and max.
differentialpressureΔpbasedonthepro-
cess medium used.