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ANDERSON GREENWOOD 4020HP PRESSURE AND VACUUM RELIEF VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
HP Vacuum Pallet
Remove nut [8], washer where used [7], to
release stem [9] from assembly. Separate
pallet disk [6], diaphragm [5], backing disk [4],
spacer disk [3], disk [2], pallet [1], support plate
where fitted [10] and any weights taking care to
identify weights removed to help reassembly.
NOTES
Figure 5
Washer item [7] not fitted to 2" (50 mm) and
3" (75 mm) sizes and; Support plate [10] used on
8" (200 mm), 10" (250 mm) and 12" (300 mm) only
Figure 5
For HP vacuum pallets subject to 2.91 psig
(200 mbar) or more in service positive pressure,
use diaphragm plate and diaphragm construction
as per spring loaded pallet shown in Figure 2.
TABLE 2 - VACUUM PALLET RANGES, inch
Nominal Size
Trim Material
2
3
4
6
8
10
12
TABLE 3 - VACUUM PALLET RANGES, mm
Nominal Size
Trim Material
50
75
100
150
200
250
300
FIGURE 5 (See Notes)
HP Vacuum Pallet
From
Aluminium
1.2
316 SST
2.5
Aluminium
1.1
316 SST
2.5
Aluminium
1.1
316 SST
2.5
Aluminium
1.1
316 SST
2.5
Aluminium
1.1
316 SST
2.5
Aluminium
1.1
316 SST
2.5
Aluminium
1.1
316 SST
2.5
From
Aluminium
316 SST
Aluminium
316 SST
Aluminium
316 SST
Aluminium
316 SST
Aluminium
316 SST
Aluminium
316 SST
Aluminium
316 SST
2
5
4
SUPPORT PLATE (10)
PALLET (1)
DISK (2)
VLP Pallet
To (inc)
2.4
5.8
1.7
3.9
1.6
3.5
2.0
4.4
2.3
4.8
2.6
4.6
2.1
4.4
VLP Pallet
To (inc)
30
61
64
147
28
43
64
99
28
41
64
89
28
51
64
112
28
58
64
122
28
66
64
117
28
53
64
112
9
3
10
8
7
6
PALLET DISK (6)
LP Pallet
Above
To (inc)
2.4
7.0
5.8
14.0
1.7
7.0
3.9
14.0
1.6
7.0
3.5
14.0
2.0
7.0
4.4
14.0
2.3
12
4.8
20
2.6
13
4.6
22
2.1
14
4.4
24
LP Pallet
Above
To (inc)
61
178
147
356
43
178
99
356
41
178
89
356
51
178
112
356
58
305
122
508
66
330
117
559
53
356
112
610
1
SPACER DISK (3)
BACKING DISC (4)
DIAPHRAGM (5)
HP Pallet
Above
To
7.0
100
14.0
100
7.0
100
14.0
100
7.0
100
14.0
100
7.0
100
14.0
100
12
100
20
100
13
100
22
100
14
100
24
100
HP Pallet
Above
To
178
2540
356
2540
178
2540
356
2540
178
2540
356
2540
178
2540
356
2540
305
2540
508
2540
330
2540
559
2540
356
2540
610
2540
8
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