Installation
Butterfly Valve S.820 & S.76
Overview
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Connection
Inside diameter of flanges
Installation of butterfly valves
Installation of butterfly valves (Movie)
Mounting direction
Connection
Connection
Wafer / U-section
The screws have to be
removed completely.
 Through bolts
Onyl then, the pipe can
be removed.
Connection
LUG
 mounted from both sides
The pipe can be removed
from one side, without
having to unscrew the valve
completely.
Connection
LUG
 mounted from both sides
The pipe can be removed
from one side, without
having to unscrew the valve
completely.
Connection
8
Connection
9
Connection
10
Connection
√ Correct
Assembly between two flanges
Assembly at the end of the line
Connection
X Not Correct
Inside diameter of flanges
Inside diameter of flanges
Dmin:
Minimum diameter of the flange
enabling to move the disc (in case of a
perfectly centered valve)
Inside diameter of flanges
DOpt:
Diameter of the flange for optimal
mounting
Inside diameter of flanges
Dmax:
Maximum diameter of the flange for low
pressure applications
(pmax = 2,5 bar)
Impact wrong Installation of Inside diameter to flanges
Cold flow of PTFE
approx. 4mm
Installation of butterfly valves
Installation of butterfly valves
1.
The flanges have to be spread in
order to ease the installation of
the valve.The disc must be partially
open.
Installation of butterfly valves
2.
Set all stay-bolts by keeping the disc
slightly open and do not tighten the
nuts
Installation of butterfly valves
3.
Open completely the disc. Ensure
that the piping is aligned. Tighten
diagonally opposite the nuts until the
flanges are in contact with the body
of the valve.
Never use gaskets nor grease.
Never weld the flanges when valve
is installed.
Impact of wrong Installation of butterfly valves
Installation of butterfly valves
Installation of butterfly valves
Installation of butterfly valves
Installation of butterfly valves
Installation of butterfly valves
Wrong
Vertical installation of a valve near a bend
The effect of the bend is increased by the
position of the valve.
Installation of butterfly valves
Wrong
Vertical installation of a valve near a bend
The effect of the bend is increased by the
position of the valve.
Installation of butterfly valves
Wrong
Vertical installation of a valve near a bend
The effect of the bend is increased by the
position of the valve.
Installation of butterfly valves
Correct
Horizontal installation of a valve near a bend
Installation of butterfly valves
Correct
Horizontal installation of a valve near a bend
Mounting direction
Mounting direction
Butterfly valves of small sizes DN 50 - 250
Butterfly valves of small size can be installed in any
given position.
Mounting direction
Butterfly valves of small sizes DN 300 - 500
These butterfly valves can be installed in any given
position, as long as the top flange points upwards or
the shaft is in horizontal position.
Mounting direction
Butterfly valves of DN bigger than 600 mm
Butterfly valves of DN 600 – 900 mm, should be
installed with their shaft in horizontal position.
Butterfly valves of DN1000 mm and above have to be
installed with the shaft in horizontal position without
exception.
Mounting direction
Ideal installation for all sizes:
Whenever possible, we recommend to install butterfly valves, with
the shaft in horizontal position.
• The weight of the shaft is evenly balanced.
• The liner in the lower area of the shaft, as well as the lower
shaft bearings are relieved.
• Problems caused by sediments are minimized.
Mounting direction
√ Correct