SPX APV DELTA MS4, Operating Manual, Page: 20 / 51

15
DELTA MS4-UK0.qxp / 05.2008
UK
Diaphragm valve with fan support
DELTA MS4
Operating Manual rev. 0
10. Service Instructions - Actuator
10.1. Maintenance of Actuator
1. Remove the air hoses from the actuator.
2. Remove the inner hexagon screws from the adapter of the control
unit. - Remove the adapter.
10.2. Dismantling of seals
1. Unscrew the two seal screws with a spanner SW 30 while holding
up the actuator with a strap wrench.
2. Remove o-rings and v-seals.
10.3. Installation of seals and assembly of actuator
1. Install the slightly greased o-rings and v-seals in the seal screws
(fig. 10.3) .
See to the right direction of installation of the v-seal.
2. Push the seal screws over the piston at both sides of the actuator
and tighten them.
3. Fasten the adapter of the control unit and the yoke on the actuator.
Attention: Observe the position of the adapter.
Attention: Consider the required valve design NC or NO
during the installation of the adapter and the
yoke.
NC
(FS) = normally closed
(air-to-raise, spring-to-lower)
NO (FH) = normally open
(air-to-lower, spring-to-raise)
4. Fix the air hoses.
10.4. Reconstruction of valve design from normally closed (NC)
to normally open (NO)
By turning the actuator by 180
o
the required design NC or NO
can be selected.
NC (FS) = normally closed
(air-to-raise, spring-to-lower)
NO (FH) = normally open
(air-to-lower, spring-to-raise)
air connection
seal screw
v-seal
v-seal
o-ring
o-ring
actuator
piston rod
seal screw
fig. 10.3