13
10.1
Maintenance of Actuator
a.
Remove the air hoses from the actuator.
b.
Remove the inner hex. screws from the adapter of the control unit.
-
Remove the adapter.
10.2
Dismantling of seals
a.
Unscrew the two seal screws with a wrench SW30 by holding
up the actuator with a strap wrench.
b.
Remove the o-rings and v-seals.
10.3
Installation of seals and assembly of the actuator
a.
Install the greased o-rings and v-seals in the seal screw
(fig. 10.3)
.
See to the right direction of installation of the v-seal.
b.
On both sides of the actuator, push the seal screws over the
piston rod and tighten them.
c.
Fasten the adapter for the control unit and the yoke on the actuator.
Attention:
Observe the position of the adapter.
Attention:
Consider the required design NC or NO
for the assembly of the adapter and yoke.
NC
=
normally closed
NO
=
normally open
d. Fasten the air hoses.
10.4
Reconstruction of the valve design from NC "normally closed"
to NO "normally open" design
By turning the actuator by
180°,
the required design NC or NO
can be adjusted.
NC
=
normally closed
NO
=
normally open
air connection
seal screw
v-seal
v-seal
o-ring
o-ring
actuator
piston rod
seal screw
fig. 10.3
UK
10.
Service Instructions Actuator
DELTA MF4-UK0.qxd / 12.2004
Membrane Valve with Bellow Unit
DELTA MF4
Operating Manual rev. 0
