10
9.
Service Instructions
9.1
Dismantling from the line system MF4 / MEF4
The item numbers refer to the spare parts darwings
MF4, MEF4:
DN design:
RN 01.064.6
Inch design:
RN 01.064.7
a.
Shut off line pressure and discharge lines and tanks if possibe.
b. Valve design NC:
control actuator with air.
Do not touch movable parts!
Risk of injury.
c.
Remove housing screws
(11)
and lift complete valve insert
including actuator out of the housing.
d. Valve design NC:
cut off compressed air and
remove compressed air supply.
e. CU design:
Remove the control unit.
(Turn safety ring in anticlockwise direction, see symbol on the
control unit.)
= open
= closed
-
Design with valve position indicator:
Remove the proximity switches. Detach the indicator housing
(proximity switch holder) from the actuator.
9.2
Dismantling of wear parts (product-wetted parts)
a. With CU design and valve position indicator:
First of all, release the actuator screw. Release the hexagon
nut
(21)
, while holding up the centering washer
(16)
. Remove
the centering washer.
b.
Pull the shaft with bellow unit
(3)
and guide rod
(9)
out of the
actuator
(13).
Remove the seat seal
(2)
and o-rings
(4, 5)
.
c.
Remove the yoke
(8)
from the actuator
(13)
.
The actuator is maintainable.
(see 10. Service Instructions, Actuator)
d.
Detach the o-ring
(6)
and the guide bush
(7)
from the yoke
(8)
.
e.
Clean the valve housing, the yoke and the shaft with a low
solution of a cleaning agent. Never use cleaning agents
containing abrasive or polishing substances.
!
actuator screw
hex. nut
centering washer
cu adapter
guide rod
actuator
yoke
housing
guide bush
o-ring (6)
o-ring (4)
o-ring (5)
seat seal
shaft with
bellow unit
control unit
actuator screw
hex. nut
centering washer
guide rod
actuator
valve position indicator
UK
DELTA MF4-UK0.qxd / 12.2004
Membrane Valve with Bellow Unit
DELTA MF4
Operating Manual rev. 0
