Table of Contents
Advertisement
− The leak and function tests have been
completed successfully (see section 5.4).
− The prevailing conditions in the plant
section concerned meet the valve sizing
requirements (see information under "In-
tended use" in section 1).
6.1 Start-up/putting the device
back into operation
1. Allow the valve to cool down or warm up
to reach ambient temperature before
start-up when the ambient temperature
and process medium temperature differ
greatly or the medium properties require
such a measure.
2. Slowly open the shut-off valves in the
pipeline. Slowly opening these valves
prevents a sudden surge in pressure and
high flow velocities which can damage
the valve.
3. Check the valve to ensure it functions
properly.
6.2 Reversing the flow direc-
tion
The medium flows through the valve in the
direction indicated by the arrow. The stan-
dard version normally operates in the flow-
to-open direction (FTO). The medium flows
across the plug from bottom to top.
The flow direction can be reversed from FTO
to FTC and vice versa.
EB 8822 EN
NOTICE
!
Risk of valve damage due to altered forces.
When reversing the flow direction, altered
forces occur which may damage the valve if
incorrectly calculated.
Î To reverse the flow direction, contact our
after-sales service.
7 Operation
Immediately after completing start-up or put-
ting the valve back into operation, the valve
is ready for use.
WARNING
!
Risk of burn injuries due to hot or cold com-
ponents and pipeline.
Valve components and the pipeline may be-
come very hot or cold. Risk of burn injuries.
Î Allow components and pipelines to cool
down or warm up to the ambient tem-
perature.
Î Wear protective clothing and safety
gloves.
WARNING
!
Risk of hearing loss or deafness due to loud
noise.
Noise emission (e.g. cavitation or flashing)
may occur during operation caused by the
process medium and the operating condi-
tions. Additionally, a loud noise may briefly
occur through the sudden venting of the
Operation
33
Advertisement
Table of Contents
