Installing The Valve Into The Pipeline; Testing The Installed Valve - Samson 3256 Mounting And Operating Instructions

Installation
5.3.3 Installing the valve into
the pipeline
NOTICE
!
Premature wear and leakage due to insuffi-
cient support or suspension.
Î Support or suspend the valve sufficiently
at suitable points.
a) Version with flanges
1. Close the shut-off valves in the pipeline
at the inlet and outlet of the plant section
while the valve is being installed.
2. Prepare the relevant section of the pipe-
line for installing the valve.
3. Remove the protective caps from the
valve ports before installing the valve.
4. Lift the valve using suitable lifting equip-
ment to the site of installation (see the
'Lifting the valve' section). Observe the
flow direction through the valve. The ar-
row on the valve indicates the direction
of flow.
5. Make sure that the correct flange gaskets
are used.
6. Bolt the pipe to the valve free of stress.
7. Attach a support or suspension on the
valve, if necessary.
b) Version with welding ends
1. Proceed as described above under 'Ver-
sion with flanges', steps 1 to 4.
5-14
2. Completely retract the actuator stem to
protect the plug from sparks during weld-
ing. "Stem extends" direction of action:
apply a signal pressure to the actuator.
"Stem retracts" direction of action: the
valve is open without any signal pressure
being applied.
3. Weld the valve free of stress into the
pipeline.
4. Attach a support or suspension on the
valve, if necessary.

5.4 Testing the installed valve

DANGER
!
Risk of bursting due to incorrect opening of
pressurized equipment or components.
Valves and pipelines are pressure equipment
that may burst when handled incorrectly.
Flying projectile fragments or the release of
process medium under pressure can cause
serious injury or even death.
Before working on the control valve:
Î Depressurize all plant sections affected
and the valve (including the actuator).
Release any stored energy.
Î Drain the process medium from all the
plant sections concerned as well as the
valve.
WARNING
!
Risk of personal injury due to pressurized
components and process medium being dis-
charged.
Î Do not loosen the screw of the test con-
nection while the valve is pressurized.
EB 8065 EN