14
seal profile
seat seal
11.1
Installation of seat seal
1.
Before the assembly, provide the seat seal with a
thin layer
of grease
.
The groove for the seat seal
must not
be greased.
2. Clamp the valve shaft in a vise. Use protective jaws to avoid damage to the shaft.
3.
Press the seal with the assembly tool (or screw driver with round edges) at four
opposite spots
1 - 2, 3 - 4
into the groove
(see sketch 1-1a).
4.
Proceed step by step to press the seal into the groove. Press the opposite side into the
groove. See to an even fit of the seat seal.
5.
Afterwards, press the assembly tool in between the seal shoulder and the groove wall
and drive round completely. The groove is vented and the seal shoulder is locked in
during this procedure
(see sketch 2)
.
1
3
2
4
sketch 1
shaft
seat seal
seal shoulder
groove
bellow
sketch 2
vent
groove bottom
sketch 1a
UK
11.
Service Instructions
DELTA MF4-UK0.qxd / 12.2004
Membrane Valve with Bellow Unit
DELTA MF4
Operating Manual rev. 0
