4
NEOTECHA
NEOSEAL BUTTERFLY VALVE
INSTALLATION AND MAINTENANCE INSTRUCTIONS
6.2 Installation in the pipeline
With the NeoSeal, the flow can be in any
direction. The recommended installation
position is with the spindle horizontal,
with the lower sealing strip opening in
the direction of flow.
A butterfly valve is not a crowbar! Please do
not use it to force the flanges apart, as this
would lead to damage to the ring bellows and
seat. To avoid damage to the disc and bellows,
the protective covers should only be removed
immediately prior to installation.
The valve can be installed either with the drive
mounted above or without a drive, assuming
that the drive allows the valve to be installed
in such a way that the sealing strip of the valve
disc is positioned a minimum of 5 to 10 mm
within the body.
It is not advisable to use the valve for positioning
pipelines in new systems. Sparks which occur
during spot welding can damage the seat.
Use adjusting pieces instead. Final welding of
the flange with the valve in position will lead
to severe damage to the valve seat due to the
high temperature.
Always use all flange bolts, even on low
pressure systems. The valve should never
be pressurized if one of the four flange
bolts that align the shaft axis is missing. If
a pipe lined with an unattached material
(e.g. PTFE) is used, it must be ensured that the
temperature-related expansion of the lining
does not restrict the movement of the valve
disc or damage the area of the seat.
6.3 Body variants
Wafer body
NeoSeal
DN 40-300 (1½”-12”)
Lugged flange body
NeoSeal
DN 40-300 (1½”-12”)
Double flanged body NeoSeal
DN 350-900 (14”-36”)
Refer to the product documentation for
bolt sizes to be used for the installation.
6.4 Step-by-step valve installation
1. Check that the distance between flanges
matches the installation length of the
butterfly valve. Before installing the valve,
spread the flanges apart sufficiently using
a suitable tool.
2. Close the valve until the sealing strip of the
valve disc is 5 to 10 mm within the body.
3. Slide the butterfly valve between the opened
flanges and insert the flange bolts through
the adjusting holes.
4. Fully open the valve. The valve is open when
the flat sections on the shaft are parallel to
the pipeline. With nominal diameters above
DN 125, the marking on the face of the
control shaft should be observed. If these
are parallel to the pipeline, the valve is open.
5. Tighten the flange bolts hand-tight as the
tool holding the flanges apart is gradually
removed. Make sure that the flanges
remain correctly aligned.
6. Slowly close the valve disc and check that
the Y measurement is less than the internal
diameter of the pipe and also has adequate
clearance.
7. When the disc is in the ‘open position’,
tighten the flange bolts in opposite pair
sequence. Refer to following table for
tightening torques.
When used as an end of line valve, it must be
secured in such a way that access to the valve
is restricted when in service.
It should also be noted that when a valve is used
as the end valve of a pressurized system, the
valve must be installed with a blind flange.
WAFER BODY
LUGGED FLANGE BODY
DOUBLE FLANGED BODY
