21
APV_DA4_UK-1_102018.indd
UK
Double Seat Mix Proof Valve
APV DELTA DA4
Instruction Manual: UK - rev. 1
APV
11. Service Instructions
11.3. Installation of product-wetted seals and assembly of the valve
Note!
Make sure that all seals and bearing surfaces in
the product area are slightly greased before
their installation.
1.
Install the lower shaft seal (13, 14) in the lower housing flange.
2.
Place the quad ring (15) and the guide ring (16) in the valve seat
(4).
3.
Installing the upper shaft seal (13, 14) in the valve seat (4).
Insert the PTFE ring (14), first. Then press the seat seal (13), the
wide side to the front, into the groove between the PTFE seal (14)
and the valve seat (4).
4.
Install the upper and lower housing seals (12).
5.
Press the upper and lower seat seal (11) into the seat ring (5).
Note!
The seal shoulder must fit properly into the groove.
6.
Slide the seat ring (5) from the top over the balancer of the upper
valve shaft (2).
7.
Slide the valve seat (4) over the balancer of the upper valve shaft
(2) in the same way.
8.
Insert the upper valve shaft (2) with seat ring (5) and valve seat (4)
through the yoke (6) and actuator (21) until it stops.
9.
Fasten the upper valve shaft (2) with the lock washer (28) and
safety nut (27). Hold the lock washer with a SW30 wrench to
keep the safety nut (27) from turning.
Tightenting torque: Md = 40 Nm
10.
Screw the operating cam on the upper shaft.
11.
Insert the middle seal (10) into the lower shaft (3) using the
assembly tool (see page 21).
12.
Assembling without the assembly tool:
Press the slightly greased seal into the groove at four locations.
Then push in the four loops of seal with a blunt object. Vent the seal
groove.
13.
Insert the quad ring (18) in the lower shaft (3).
14.
Install the O-ring (9) at the guide rod (7).
15.
Slide in the guide rod (7) from the top through the actuator (21) until
it stops.
16.
Slide the lower valve shaft (3) on the guide rod (7) and fasten it with
the safety nut (19).
Tightening torque: Md = 40 Nm
Note!
Check the position of the lower seat seal (11).
operating cam
upper shaft
26
7
28
27
21
6
16
15
13, 14
2
4
detail x
3
19
13, 14
12
12
detail x
fig. 11.3.
operating cam
lower shaft
4 screws
18
9
11
5
11
10
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