6
Figure 2: Mounting LME 620, example
7.3.1
Valve Design Requirements
-
Consider the end position forces (up to 2.5 x rated force) when designing the valve.
7.4 Mounting the Actuator to the Valve
-
Completely retract the actuator thrust rod and put the actuator on the valve yoke.
-
Make sure the valve stem is centrically aligned with the bore and at right angles to
the actuator seat (permissible parallel deviation < 0.1 mm referred to total stroke).
-
Fasten the actuator to the yoke with screws of property class 8.8 (tensile strength
800 N|mm
2
; yield strength 640 N/mm
2
)
-
Use the handhweel to extend the thrust rod, link the rod with the valve stem via the
clutch.
-
Manually retract the thrust rod to check whether or not the external stop of the ac-
tuator is on the housing flange before the valve cone gets in touch with the cover.
-
If required, adjust with the clutch (only possible within certain limits!)
fastening scrrews
external limit stop
coupling
valve stem
valve yoke
valve
mech. position
indicator
thrust rod
(r00018x1)
