© 2021 Emerson. All rights reserved.
VCIOM-16425-EN 21/05
Before installation, these instructions must be read carefully and understood.
ANDERSON GREENWOOD
4020HP PRESSURE AND VACUUM RELIEF VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
TABLE OF CONTENTS
1. Safety Precautions ........................................ 2
2. General Descriptions .................................... 2
3. Operation ....................................................... 2
4. Set Pressure/Vacuum Verification ............... 3
5. Installation ..................................................... 5
6. Maintenance .................................................. 5
7. Valve Disassembly ......................................... 5
8. Valve Refurbishment ..................................... 9
9. Valve Reassembly ......................................... 9
10. Testing Set Pressure and Vacuum ............. 10
Tables and Figures
Table 1
Inlet Flange Thread Forms ............. 5
Table 2
Vacuum Pallet Ranges, inch ........... 8
Table 3
Vacuum Pallet Ranges, mm ........... 8
Table 4
Seat Lap Band Width ....................... 9
Table 5
Pallet Thickness ............................ 10
Table 6
Pallet Lengths ............................... 10
Table 7
Equivalent Weights for
Vacuum Setting ............................. 11
Table 8
Replacement Parts ....................... 13
Figure 1 Valve General Assembly ................. 4
Figure 2 Pressure Pallet Assembly .............. 6
Figure 3 Vacuum Pallet Assembly
VLP/LP 2" (50 mm), 3" (75)
and 4" (100 mm) .............................. 7
Figure 4 Vacuum Pallet Assembly
VLP/LP 6" to 12"
(150 mm to 300 mm ) ...................... 7
Figure 5 Vacuum Pallet Assembly HP .......... 8
