5-2
EB|LTR|43_EN
May 2023 edition
Subject to technical changes
Installation
5.2 Preparing for assembly
Danger due to escaping medium resulting from unsuitable
fl ange seals!
Leaks caused by unsuitable fl ange seals can cause operating me-
dium to escape. Flange leaks can cause fatal injury to personnel
and damage the environment.
Ö The butterfl y valves of series LTR43-2 and LTR43-9.9 have
special dimensions, if applicable. It is indicated in the order
confi rmation or the dimension sheet if special dimensions are
required.
Ö Special dimensions can be requested from SAMSON
LEUSCH. Contact SAMSON LEUSCH through the nearest
SAMSON offi ce.
Danger of injury due to moving parts with spring-loaded
actuators!
Spring-loaded actuators may only be pressurised when installed
in the pipe and not to perform work on the butterfl y valve outside
of the pipe. There is risk of fatal injury if the pneumatic energy
suddenly fails and the valve disc moves automatically to the fail-
safe position by means of spring force.
Ö Install butterfl y valves that have a spring-loaded actuator with
the “fail open” fail-safe position in the open position. Remove
the pipe if necessary.
Ö Do not damage the sealing surface.
Employees or third parties may not be endangered.
Any applicable legal regulations of the country of destination
must also be observed.
Actuators of series LTR|43-2, LTR|43-4 and LTR|43-9 have an
interrupted fl ange sealing surface on one side.
For sealing surfaces according to EN1092-1B1 and B2 as well
as ASMEB16.5 RF and ASMEB16.47 RF, it must be ensured that
the fl at seals are suitable according to EN1514-1 and/or
ASMEB16.21.
Other seals.
For other seals, such as spiral or grooved gaskets, the standard-
ised dimensions may not be suitable.
Ö Contact SAMSON LEUSCH for suitable special dimensions.
Ö Upon request, SAMSON LEUSCH can supply these seals.
Damage to the butterfl y valve due to incorrect insulation!
Insulate butterfl y valves with a body extension with medium tem-
peratures below -60°C or above 350°C only up to the maxi-
mum permissible height.
Ö In the case of high temperature applications, insulate only the
lowest third of the insulation part.
Ö In the case of low temperature applications, insulate only the
lowest two thirds of the entire length.
Ö In the case of cold-box applications, insulate the cold-box
cover up to the lower edge. If the insulation part is insulated
at an impermissibly high level, it can lose its function!
DANGER
NOTE
The plant operator is responsible for cleaning the pipes in the
plant.
Ensure the following conditions prior to assembly:
− The actuator is clean.
− The actuator and all attachments inclusive of the pipes are
not damaged.
− The data on the type plate (type, nominal size, material,
nominal pressure and temperature range) matches the plant
conditions and conditions of use. For details about the type
plate, see Chapter “2 Markings on the device”.
− Additional optional components are installed or prepared to
the point as required prior to the assembly of the actuator,
see Chapter “3.2 Additional optional components on the
actuator”.
− Suffi cient installation space is available.
− The pipe connections must be aligned plane-parallel, fl ush
and tension-free.
− Measures for avoiding contact with hazardous media were
found.
− All welding requirements have been met.
Perform the following preparation steps for assembly:
− Get the material and tools ready that are required for
assembly.
− If the butterfl y valve and actuator are already assembled to-
gether, check the screw connections for the correct tightening
torques, see Chapter “15.1.1 Tightening torques” or
LW-
10017, Annex 15.2. Components can loosen up during
transport.
5.3 Assembling the butterfl y valve
The tasks are listed below that are necessary for assembly and
prior to the commissioning of the butterfl y valve.
Make sure before assembly that all necessary preparations are
made, see Chapter 5.2.
5.3.1 Assembling the butterfl y valve and
actuator
The SAMSON LEUSCH actuators are delivered in working order.
In individual cases, the actuator and butterfl y valve are delivered
separately and must be assembled.
The tasks are listed below that are necessary for assembly and
prior to the commissioning of the actuator.
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