22
APV_DE3_UK-7_082017.indd
UK
Double Seat Valve
DELTA DE3
Instruction manual: UK - rev. 7
APV
15. Service Instructions
for the installation of seat seals
1.
Provide the seal shoulder with a
thin layer of grease.
seal profile
seal lip
shoulder
upper
valve shaft
X
lower
valve shaft
Attention:
Shoulder of the
seal must be
placed evenly
in the
seal groove.
(fig. X)
grease layer
grease layer
2.
Insert the seat seal into the valve shaft;
see to an even inclined position of the
seal.
3.
Press the seal circumferentially into the
groove by means of an assembly tool
(use screw driver with round edges).
Place the assembly tool at the upper seal
shoulder.
To get an even fit of the seal, proceed step by
step:
3.1.
Press a short piece part of the seal into the
groove.
3.2.
Fix the seal - already pressed in - by your finger
(to prevent loops). Use the assembly tool to press
a short part of the seal into finger direction. Install
the seal in the groove circumferences.
4.
Press the assembly tool between the seal
shoulder and the groove edge (both sides).
Proceed around the circumferences. Then
proceed around the circumferences of the lower
seal shoulder. This is to vent the seal groove and
to lock the seal shoulder.
seal foot