ANDERSON GREENWOOD
4020HP PRESSURE AND VACUUM RELIEF VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
FIGURE 2
Pallet Assembly
7.2 Vacuum Side
1. Remove hex set screws [V10], washers [V9],
cover [V2] and O-ring [V8].
2. Remove shroud [V5] and lift out vacuum
pallet assembly [V11] complete with vacuum
setting weights (for higher set valves,
remove some of the lead before lifting out
the pallet assembly).
For 8" (200 mm), 10" (250 mm) and
12" (300 mm) sizes, cover [V2] has separate
guide. If required, remove guide tube [V16]
and guide tube gasket [V15].
3. Remove seat [V3] complete with vacuum
posts [V4] by removing cap screws [V6].
4. Remove O-ring [V7]. Identify pallet assembly,
weights and seat as vacuum side parts.
If required, unscrew hex set screws [V14],
remove mesh plate [V13] and recover
vacuum mesh [V12].
7.3 Pressure Pallet (See Figure 2)
1. Remove nut [8] and washer, where used [7]
to release pivot point [9] from assembly.
2. Separate pallet disk [6], diaphragm [5],
diaphragm plate [4], disk [3], pallet [2] and
support plate [1].
3. Remove pivot point gasket [10].
SUPPORT PLATE (1)
PALLET (2)
DISK (3)
DIAPHRAGM PLATE (4)
DIAPHRAGM (5)
PALLET DISK (6)
WASHER (7)
NUT (8)
NOTE
Washer Item (7) not fitted to 2" (50 mm) and 3" (75 mm) sizes.
6
4
3
5
6
7
8
10
2
1
9
