operating cam
upper shaft
26
7
27
21
6
16
15
13, 14
2
4
detail x
3
19
13, 14
12
12
detail x
fig. 11.2.
operating cam
lower shaft
4 screws
18
9
11
5
11
10
20
APV_DA4_UK-1_102018.indd
UK
Double Seat Mix Proof Valve
APV DELTA DA4
Instruction Manual: UK - rev. 1
APV
11. Service Instructions
11.2. Removal of product-wetted parts
1.
Remove the lower and upper housing seal (12) from the valve seat
(4).
2.
Release the lower safety nut (19). Hold the lower shaft (3) with an
SW17 wrench to keep it from turning.
3.
After removing the nut (19), lift off the lower shaft (3).
4.
Place the point of the tool along the side of the middle seal (10) and
pull it out of the groove. Take the quad ring (18) out of the groove.
5.
Remove the operating cam from the guide rod (7).
6.
In order to take off the adapter, remove the 4 screws.
7.
Remove the stop screw (26).
8.
Take the guide rod (7) out through the top of the actuator and
remove the O-ring (9).
9.
Remove the operating cam at the upper shaft.
10.
Unscrew the safety nut (27). Hold up the lock washer (28) with a
SW30 key to keep it from turning. Remove the lock washer.
11.
Lift off the actuator (21) with yoke (6).
12.
Press the upper valve shaft (2) with seat ring (5) to the bottom out of
the valve seat (4).
13.
Slide the seat ring (5) over the balancer of the upper valve shaft (2).
14.
Remove the seat seals (11) from the grooves.
15.
Removing the upper shaft seal (13, 14)
Place the point of a tool along the side of the seat seal (13) and pull
it out of the valve seat, then remove the PTFE seal (14).
16.
Remove the quad ring (15) and guide ring (16) from the groove of
the valve seat (4).
17.
Removing the lower shaft seal from the housing
Place the point of the disassembly tool along the side of the seat
seal (13) and pull it out through the top of the housing. Then remove
the PTFE seal (14) through the top of the housing, using the mandril
of the assembly tool, see page 20.
28