3-1
EB|LTR|43_EN
May 2023 edition
Subject to technical changes
Design and principle of operation
3 Design and principle of operation
Figure|3-1: Sectional view LTR 43
Table|3-1: Parts list
Pos. Designation Pos. Designation
1 Body 17 Bracket
2 Disc 18 Coupling
3 Seal ring 39 Packing
4 Seat A1 Centre console actuator
6 Shaft A2 Spring cylinder actuator
7 Cover A3 Pneumatic cylinder actuator
8 Gland
The LTR43 is a triple-eccentric control and shut-off butterfl y
valve. It is preferably combined with pneumatic actuators in the
“rack and pinion” or “scotch-yoke” version, or can also be com-
bined with electric or hydraulic actuators as well as manual
gears.
The designed butterfl y valve is available in different series for al-
most all applications and specifi cations for the control and shut-
off of fl uids.
The series differ in the structure of the sealing system. The follow-
ing paragraph provides an example in order to explain the func-
tionality of the valve. In the case of a special design or in combi-
nation with a different auxiliary energy, the functionality may dif-
fer slightly.
The butterfl y valve body (1) either contains an installed replacea-
ble seat (4) or it is integrated fi xed in the body (1a). The respec-
tive seal ring (3) that is fastened to a disc (2) is connected with
the actuator via a shaft (6). The actuator itself is fi xed to the valve
body by means of a bracket (17).
Adjusting the signal pressure that acts on the drive pistons (A3)
changes the position of the wedge-lock-washer with respect to
the seat, and therefore the fl ow rate. The springs (A2) installed in
pneumatic actuators move the wedge-lock-washer with the seal
ring into the respective fail-safe position if the pneumatic energy
fails. The seal between the body and the shaft is guaranteed by
the packing rings (39) pressed by a stuffi ng box (8).
To Next Page
Loading...
