Richter NKP Series Butterfly Valves - Manual (Page 11)

Series NKL, NKLP, NKS, NKSP, NK, NKP
Page 11
9520-070-en Revision 04
TM 7113 Edition 05/2008
5.5 Disposal
Parts of the valve may be contaminated with medium
which is detrimental to health and the environment
and therefore cleaning is not sufficient.
Risk of personal injury or damage to the
environment due to the medium!
Wear protective clothing when work is performed
on the valve.
Prior to the disposal of the valve:
Collect any medium, etc. which has escaped and
dispose of it in accordance with the local regulati-
ons.
Neutralise any medium residues in the valve.
Separate valve materials (plastics, metals etc.)
and dispose of them in accordance with the local
regulations.
6 Installation
Examine valve for in-transit damage, damaged
diaphragm valves may not be installed.
Before installation the valve and the connecting
pipe must be carefully cleaned to remove any dirt,
especially hard foreign matter.
During installation, pay attention to the correct tigh-
tening torque, aligned pipes and tension-free as-
sembly.
Ensure that a remotely actuated actuator
cannot be accidentally switched on.
6.1 Installation possibilities
Series NK double-flange body
They can be connected for sandwich installation or as
dead-end valves. They have flange bores to ISO
7005-2 PN 10 (DIN 2501 PN 10) or to ASME/ANSI B
16.5 Class 150.
When installed as intermediate flange valves, the pipe
screws are inserted through the flange bores and ser-
ve as a centering aid.
When installed as a dead-end valve, threaded rods
and nuts are used, thus providing an alternative con-
nection to either pipe side.
Series NKS sandwich body
They are used for sandwich installation. The valve is
clamped between the two pipes.
Series NKL lug-style body
They are suitable as an intermediate flange and dead-
end valve. They have flange bores to ISO 7005-2 PN
10 (DIN 2501 PN 10) to ASME/ANSI B 16.5 Class
150; they permit independent bolting from each other.
On request, through holes can also be provided
instead of the tapped bores.
6.2 Flange caps and gaskets
Leave protective caps on the flanges until just prior to
installation.
Where there is a particularly high risk of damage to
the plastic sealing surfaces, e.g. if the mating flanges
are made of metal or enamel, PTFE-lined gaskets
with a metal inlay should be used. These gaskets are
available as special accessories in the Richter range.
6.3 Direction of flow and
installation position
Installation is independent of the direction of flow.
Any fitting position can be chosen.
Except solids-containing liquids:
With solid containing media butterfly valves are prefe-
rably installed with horizontally positioned stem and
bottom half of disc opening into flow direction.
6.4 Installation
Can the disc open in the pipeline?
For dimensions see Section 1.4.
Is the disc open 10 – 15°?
Mount butterfly valve and gaskets centrically.
Tighten the piping bolts crosswise and hand-tight.
By means of a test actuation ensure that the disc is
able to freely rotate.
With the disc slightly opened, tighten the piping
bolts crosswise. For the torques see Section 1.3.
Butterfly valves which are used as end
valves must be sealed with a blind flange
at the free connection end and
appropriately
secured against
unauthorised activation.