www.ismacontrolli.com
The performances stated in this sheet can be modifi ed without any prior notice.
page 1
DIM262en | 1
st
Issue rev. 3 | 07/2022
MVH56Ex
Valve Actuators with Emergency Fail-safe Function
INSTALLATION
Hot media hazard. Before removing actuator from valve or
opening the valve, ensure that the valve control medium is iso-
lated and remove the pressure. Work should only be carried
out by a competent engineer.
Note:
do not use the actuator disassembled from
the valve.
MVH56EA
For valve with 16 and 25mm stroke
• Rise the valve stem;
• Lock the stem extension c on the rack completely re-
tracted placing the indicator disk a, the jagged washer b
and the nut f positioned half of the extension itself.
For valves with 45mm stroke
• Rise the valve stem;
• Lock the stem extension c on the rack completely re-
tracted placing the indicator disk a and the jagged washer
b.
Assemble the actuator to the valve by U-bolt
(d)
and the two
nuts
(e)
without locking the nuts.
• Raise the valve stem.
• Remove the cover and rotate the pivot clockwise so that
the rack comes out for assembling it with the valve stem;
the pivot can be locked by a spanner as shown in the pi-
cture.
• Rotate the actuator to screw the extension on the valve
stem, so lock it tightening the nut on the stem.
• Tighten the two nuts on the U-bolt to lock the actuator.
• Remove the key from the pivot and mount the small cap.
1
1a
2
3
