Keeping the World Flowing
19
12.7.3 Single-Acting Actuator with MH And MHD Type
Manual Override, Cylinder Stop Bolt Setting
Perform the following operations as first setting.
Adjust the stop bolt located in the manual override as follows:
Fig 12.12 MHD
Fig 12.13 MH
A. Use a device to engage the handwheel
(only for MHD type)
B. Ensure the jackscrew override is in a fully retracted
position by rotating the handwheel clockwise
C. Verify the absence of pressure
D. Remove cap nut (4) with seal washer (5)
4 5 6
E. Loosen stop nut (6)
F. Slowly pressurize the cylinder to detach stop bolt
from piston
7 6
G. To increase angular stroke, rotate stop bolt (7)
anti-clockwise
H. Remove pressure
I.
Verify the newly obtained angular position with one stroke
J. Repeat operations A to I, until the desired angle is obtained
K. To decrease angular stroke, rotate setting dowel (7)
clockwise
L. Remove pressure
M. Verify the newly obtained angular position with one
stroke
N. Repeat operations A to F and K to M, until the desired
angle is obtained
12.0 Operation
A4 US
US
A4
US
A4
A4 US
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