Manual TRV25

VG5000 Series_11 2009 7
Mounting Instructions
General Guidelines
In addition to general installation instructions, please
observe the following points:
• Ensure that valve body and piping are free of
impurities.
• Pay attention to position of the valve relative to the
flow direction.
• Note arrows on valve body.
• Ensure that threaded connections of valve and
piping are tighten.
• Ensure installation without tension and torque.
• Do not use the valve as a step or fixation point.
Only piping supports it.
• Protect valve from dust or dirt on construction
sites.
• Provide strainer or filter upstream of valve.
• Use compensators to balance thermal expansion
of piping.
• Ensure that stem thread and shaft are kept free of
paint.
Installation Site Information
The valve installation site should be easily accessible
and provide sufficient room for service and removal of
actuators. Manual shut-off valves should be located up
and downstream of the control valve, to facilitate
service and repairs without drainage of the piping
system. The control valve should preferably be
installed in vertical or horizontal position.
NO
OK
<=90° >90°
Piping should be insulated to protect actuators against
high temperatures. Insulation should leave sufficient
room for service of stem packing. To ensure trouble
free function of the control valves the pipe immediately
upstream of the valve should be straight far the length
of at least. 2x DN and the pipe immediately
downstream straight far the length at least 6x DN.
Commissioning
Prior to commissioning check information on material,
pressure, temperature and flow direction in
conjunction with the installation piping system plan.
Impurities in the piping system and valves, such as
dirt, welding beads etc. will cause the system to leak.
Prior to commissioning a new installation or re-
commissioning after repairs or service, ensure that:
• Correct installation- and assembly work has been
completed.
• Only qualified personnel carry out commissioning.
• Correct functional position of the valve is
ascertained.
• Maintenance of existing protective facilities is
carried out.
• Using the valve against the flow directions is not
recommended because it can lead to noise
formation and damage of the valve. If back
flushing is indispensable the maximum differential
pressure across the valve must not exceed half of
the max rated pressure drop (see “Technical
Specifications”, page 8).
Valve Removal
In addition to general guidelines the following points
should be observed:
• Pressure free piping system
• Cooled fluid
• Drained piping system
• With corrosive or aggressive fluids, the piping
system should be vented.
Work to be performed by qualified personnel only.
Adjustments
The Kv
s
value can be adjusted on some models (see
“Ordering Codes” on page 2) by setting the screw on
top of the valve in any of five selection marks.
1
2
3
Mark is here for max. Kv (Cv)