Valve Requirements; Mounting Examples; Assembly With The Valve - ABB Contrac LME620-AI Operating Instruction

3.3.1

Valve requirements

• The force in the end position can be up to 2.5 times higher than the rated force.
3.4

Mounting examples

Fig. 4: Mounting example LME620-AI/-AN (Contrac)
1 Servo motor
2 Handwheel
3 Mounting screws (8.8)
4 External stop
5 Coupling
3.5

Assembly with the valve

1. Drive the thrust rod completely in and put the actuator onto the valve yoke.
2. Make sure the valve stem is aligned with the center of the bore and at right angles to the
actuator seat (permissible parallel deviation < 0.1 mm (0.009 inch) with regard to total
stroke).
3. Fasten the actuator to the yoke with screws of property class 8.8 (tensile strength 800
N/mm
inch)).
4. Use the hand wheel to drive the thrust rod out; link the rod with the valve stem via the
coupling.
5. Manually retract the thrust rod to check whether or not the external stop of the actuator is on
the housing flange before the valve cone touches the cover.
6. If required, adjust with the coupling (only possible within certain limits!).
42/68-273-EN
2
(116032 pounds/square inch); yield strength 640 N/mm
LME620-AI/-AN (Contrac)
6 Valve stem
7 Valve yoke
8 Valve
9 Mechanical position indicator
10 Thrust rod
2
(93550 pounds/square
Installation
13