11
9.
Service Instructions
9.3
Installation of seals and assembly of valve
Provide all seals with a thin layer of grease before their
installation.
a.
Insert the guide bush
(7)
and o-ring
(6)
into the yoke
(8)
.
Fasten the yoke
(8)
at the actuator
(13).
b.
Install the seat seal
(2)
in the lower valve shaft
(3)
.
(see Service Instructions 11.)
c.
Insert the o-rings
(4, 5)
into the shaft grooves.
d.
Slide the protective pipe over the thread of the guid rod.
Place the shaft with bellow unit
(3)
and guide rod
(9)
through
the yoke
(8)
and actuator
(13).
-
The shaft must be led smoothly through the guide bush in
the yoke. If the shaft stiffs, check the right fit of the guide
bush.
e. CU design and valve position indicator:
Place the centering washer
(16)
. Apply a drop of a screw locker
(e.g. type: Loctite - semi-solid) on the thread of the guide rod.
Screw on the hexagon nut
(21)
and fasten it with a
tightening torque of MD = 40 Nm.
Hold up the centering
washer during this process.
-
CU:
Tighten the plastic actuator screw.
-
Valve position
indicator:
Screw on the metal actuator screw and
fasten it with a tightening torque of
Md = 40 Nm.
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
UK
DELTA MF4-UK0.qxd / 12.2004
Membrane Valve with Bellow Unit
DELTA MF4
Operating Manual rev. 0
