Table of Contents
Advertisement
Mounting and start-up
the sealing ability of the bellows to be moni‑
tored.
WARNING
!
Risk of personal injury due to pressurized
components and process medium escaping
under pressure.
Do not loosen the screw of the test connec‑
tion while the valve is in operation.
Noise emissions
Trims with flow dividers can be used to re‑
duce noise emission (see u T 8081).
5.2.3
Installing the control
valve
1. Depressurize the plant.
2. Remove the protective caps from the
valve ports before installing the valve.
3. Lift the valve using suitable lifting equip‑
ment to the site of installation (see sec‑
tion 4.2.2). Observe the flow direction
through the valve. The arrow on the
valve indicates the direction of flow.
4. Make sure that the correct flange gaskets
are used.
5. Bolt the pipe to the valve free of stress.
6. Depending on the field of application,
allow the valve to cool down or heat up
to reach ambient temperature before
start up.
7. Make sure that the vent of the pilot valve
and the pressure connection on the top
case of the actuator are open.
34
8. Check the valve to ensure it functions
properly.
5.3 Quick check
SAMSON valves are delivered ready for
use. To test the valve's ability to function, the
following quick checks can be performed:
Leak test
Î Perform the leak testing as described in
section 7.5.
Travel motion
The movement of the actuator stem must be
linear and smooth.
Î Open and close the valve, observing the
movement of the actuator stem.
Î Apply the maximum and minimum con‑
trol signals to check the end positions of
the valve.
Î Check the travel reading at the travel in‑
dicator scale.
Fail-safe position
Î Shut off the signal pressure line.
Î Check whether the valve moves to the
fail‑safe position.
Pressure test
During the pressure test, make sure the fol‑
lowing conditions are met:
− Retract the plug stem to open the valve.
− Observe the maximum permissible pres‑
sure for both the valve and plant.
EB 8020-1 EN
Advertisement
Table of Contents
