Maintenance Work On The Butterfl Y Valve In A Removed Condition; Assembling And Commissioning The Actuator After Maintenance Work; Design Of The Sealing System; Butterfl Y Valve Ltr 43-2 And Ltr - Samson EB LTR 43 Mounting And Operating Instructions

First tighten the screws (53) cross-wise with slight manual
force. Then tighten with the specifi ed tightening torque,
see Chapter "15.1.1 Tightening torques" or
Annex 15.2.
Check the butterfl y valve for any leaks in this area prior to
commissioning. If there is still leakage, contact SAMSON LE-
USCH through the nearest SAMSON offi ce.
9.3.4 Maintenance work on the butterfl y
valve in a removed condition
Observe Chapter 11 for actuator disassembly.
SAMSON LEUSCH recommends a rep-kit for the performance of
this work, see Chapter "15.3 Spare parts".
Replacing the seat and seal ring
The series differ in the design of the sealing system, see Chapter
9.6.
The procedure for replacing the seat and seal ring is described in
separate documentation, see the "Applicable documents" in
Chapter 1. The specifi c series is identifi ed on the type plate, see
Chapter "2 Markings on the device". For series LTR 43-2 and LTR
43-9.9, the seat and seal ring must always be replaced in pairs.
9.4 Assembling and commissioning the
actuator after maintenance work
The assembly and commissioning of the actuator takes place ac-
cording to the specifi cations in Chapter "5 Assembly" and "6
Commissioning".

9.5 Design of the sealing system

The following fi gures describe the constructive design of the seal-
ing system of the different LTR43 butterfl y valve series.
EB LTR 43_EN
May 2023 edition
Subject to technical changes
9.5.1

LW-10017
Figure 9-4: LTR 43-2 and LTR 43-9.2
Table 9-3: Parts list for
Pos.
9.5.2
Figure 9-5: LTR 43-3
Table 9-4: Parts list for
Pos.
Butterfl y valve LTR 43-2 and LTR 43-9.2
LTR 43-2 and LTR 43-9.2
Designation
1
2 Wedge-lock-washer
3
4
5 Retaining ring
Butterfl y valve LTR 43-3
LTR 43-3
Designation
1
2 Wedge-lock-washer
3
Servicing
Body
Seal ring
Seat
Body
Seal ring
9-5