ANDERSON GREENWOOD
4020HP PRESSURE AND VACUUM RELIEF VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
9.2 Pressure Pallet (See Figure 2)
Assemble pivot point gasket [10], support
plate [1], pallet [2], disk [3], diaphragm plate [4],
diaphragm [5], and pallet disk [6], to pivot
point [9] and secure using washer if fitted [7]
and nut [8].
If required, PTFE tape can be applied to stem
threads and locking compound used to secure
the nut.
9.3 Vacuum Side (See Figure 2)
1. If previously removed, assemble vacuum
mesh [V12], mesh plate [V13] and secure
using hex set screws [V14].
2. Reassemble vacuum posts [V4] (if removed),
and O-ring [V7] to seat [V3]. Secure
seat to body [V1] using cap screws [V6]
ensuring that O-ring is not dislodged
during assembly.
3. Reinstall vacuum pallet as identified during
valve disassembly ensuring the pallet slides
easily between the vacuum posts.
4. Return vacuum setting weights again as
identified during disassembly. Assemble
shroud [V5] which should be installed over
the vacuum posts [V4].
For 8" (200 mm), 10" (250 mm) and
12" (300 mm) sizes, cover [V2] has separate
guide. If previously removed, fit new
guide tube gasket [V15] and assemble
guide tube [V16].
5. Assemble O-ring [V8] to cover [V2] and
assemble cover to body [V1] ensuring that
O-ring is not dislodged during assembly.
Secure using washers [V9], and hex set
screws [V10].
CAUTION
Whenever cover is removed and refitted, ensure
correct engagement of the pallet stem.
9.4 Pressure Side (See Figure 1)
1. Reassemble guide posts [P4] (if removed),
and O-ring [P7] to seat [P3]. Secure
seat to body [V1] using cap screws [P6]
ensuring that O-ring is not dislodged
during assembly.
2. Reinstall pressure pallet as identified during
valve disassembly ensuring the pallet slides
easily between the guide posts. Place ball
[P11] in socket of pivot point [8]. Refit bird
screen [P5] and weather hood [P1].
3. Assemble stem [P13] complete with lower
spring plate [P12] to locate on ball [P11].
Assemble spring [P14], and upper spring
plate [P15]. For valves 6" (150 mm) and
larger, fit skid ring [P17] in recess of upper
spring plate.
4. Assemble casing [P2] over stem [P13] and
guide posts [P4] securing with washers
[P8] and nuts [P9]. Assemble adjusting
screw [P16] over stem [P13] and screw into
casing [P2]. Apply nominal load to spring
and secure using locknut [P18]. Assemble
Cap [P19].
10.0 TESTING SET PRESSURE AND VACUUM
The pressure and vacuum settings should be
checked and if necessary adjusted as described
in Section 4.
CAUTION
This product is a safety related component and
improper application, installation or maintenance
of the valve or the use of parts or components not
supplied by Emerson Automation Solutions Final
Control UK Ltd. may result in failure of the valve
.
TABLE 5 - PALLET THICKNESS
TABLE 6 - PALLET LENGTHS
Pallet Material Thickness, In. (mm)
2 (50)
3 (75)
4 (100)
6 (150)
8 (200)
10 (250)
12 (300)
HP
0.03 (0.76)
0.03 (0.76)
0.03 (0.76)
0.05 (1.27)
0.05 (1.27)
0.05 (1.27)
0.05 (1.27)
LP
0.03 (0.76)
0.03 (0.76)
0.03 (0.76)
0.05 (1.27)
0.05 (1.27)
0.05 (1.27)
0.05 (1.27)
VLP
0.03 (0.76)
0.02 (0.51)
0.02 (0.51)
0.02 (0.51)
0.02 (0.51)
0.02 (0.51)
0.02 (0.51)
Nominal Size,
In. (mm)
Dimensions
Pressure Pallet
Vacuum Pallet
A, In. (mm)
B, In. (mm)
A, In. (mm)
B, In. (mm)
10
2 (50)
3.03 (77)
0.19 (5)
3.03 (77)
0.31 (8)
3 (75)
4.40 (112)
0.3 (8)
4.40 (112)
0.5 (13)
4 (100)
5.78 (147)
0.4 (10)
5.78 (147)
0.6 (15)
6 (150)
8.70 (221)
0.6 (15)
8.70 (221)
0.9 (23)
8 (200)
11.6 (295)
0.8 (20)
11.6 (295)
1.25 (32)
10 (250)
14.5 (368)
1.0 (25)
14.5 (368)
1.57 (40)
12 (300)
17.4 (442)
1.18 (30)
17.4 (442)
1.8 (46)
