3-2
EB|LTR|43_EN
May 2023 edition
Subject to technical changes
Design and principle of operation
The butterfl y valve reaches its maximum tightness when it is oper-
ated according to the preferable pressure force direction (FTC)
when installed in the pipe system. The preferable pressure force
direction is indicated by an arrow on the side of the body.
Fail-safe positions
If the butterfl y valve switches to a defi ned fail-safe position when
the pneumatic energy fails, it depends on the utilised butterfl y
valve, see the corresponding actuator documentation.
The position of the wedge-lock-washer is indicated by two red
dots just above the stuffi ng box. When the butterfl y valve is
closed, the imaginary connection axis is the red marks at a right
angle to the fl ow direction. When the actuator shaft rotates clock-
wise, the butterfl y valve closes (clockwise to close).
Figure|3-2: Position indicator
Actuator closed by springs (FS)
Upon reduction of the signal pressure or failure of the pneumatic
energy, the springs move the actuator shaft clockwise and close
the butterfl y valve.
The butterfl y valve opens when the signal pressure increases, act-
ing against the force of the springs.
Actuator opened by springs (FÖ)
Upon reduction of the signal pressure or failure of the pneumatic
energy, the springs move the actuator shaft counterclockwise and
open the butterfl y valve.
The butterfl y valve closes when the signal pressure increases, act-
ing against the force of the springs.
3.1 Variants
For very high or very low temperatures, the butterfl y valve can be
provided with a body extension and, for example, insulated with
a cold-box cover.
Various variants and special designs, such as a heating jacket
body, sealing gas connections, exterior bearing points, oxygen
versions, TA-Luft seals, etc. are available upon request.
3.2 Additional optional components on the
valve
Body extension
For operating or design temperatures below -60°C (-76°F) or
above 350°C (662°F), the valves are equipped standard with a
body extension (insulation part), see Chapter “5.2 Preparing for
assembly”.
Grip protection
In the case of conditions of use that require a high level of safety
(e.g. if the valve is freely accessible to untrained specialist per-
sonnel), grip protection must be provided to exclude the risk of
crushing due to moving parts (actuator shaft). The decision
whether to use grip protection is the responsibility of the plant
operator and depends on the risk potential of the individual
plants and their respective conditions.
Noise reduction
Trims with fl ow dividers can be used to reduce noise emissions.
Fixed assembly plates on the actuator for control accessories.
For optimal accessibility and maintenance, the actuator accesso-
ries can be fi t on a central plate as the operator level, depending
on the application.
Weather protection equipment
To protect the valve function against the risk of pitting due to the
entry of foreign material (e.g. sand) between the stuffi ng box
and the shaft, additional cover plates can be attached to the
bracket upon customer request.
To protect the actuator accessory (e.g. solenoid valve, positioner)
against the sun, rain and other environmental infl uences, addi-
tional protective devices can be attached upon customer request.
Fire-resistant insulation
Upon customer request, the fi re resistance of the valve with re-
spect to the installation environment can be increased by means
of individually customised fi re protection equipment.
Danger of burns due to heated components!
Additional optional components can become very hot during
operation and cause burns upon contact.
Ö Let components and pipes cool down.
Ö Wear protective garments and protective gloves.
WARNING
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