Emerson ANDERSON GREENWOOD 4142HF Manual

Before installation, these instructions must be carefully read and understood.
ANDERSON GREENWOOD 4142HF PRESSURE RELIEF VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
© 2021 Emerson. All rights reserved.Emerson.com VCIOM-16471-EN 21/05
TABLE OF CONTENTS
Tables and Figures
Table 1 Seat Lap Band Width....................... 6
Table 2 Pallet Thickness.............................. 7
Table 3 Pallet Pressure Ranges.................. 7
Table 4 Equivalent Weights for
Pressure Settings............................ 9
Table 5 Replacement Parts ....................... 10
Figure 1 Valve General Assembly ................. 5
Figure 2 Pallet Construction ......................... 8
1. Safety Precautions ........................................ 2
2. General Descriptions .................................... 2
3. Operation ....................................................... 2
4. Set Pressure Verification.............................. 3
5. Installation..................................................... 3
6. Maintenance .................................................. 4
7. Testing Set Pressure .................................... 7
8. Pallet Identification ....................................... 7

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ANDERSON GREENWOOD 4142HF PRESSURE RELIEF VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
1 SAFETY PRECAUTIONS
Read and understand this instruction manual
before installing, operating or performing
maintenance on the Anderson Greenwood
4142HF Pressure Relief Valve (PRV) following
all precautions and warnings noted herein.
NOTE
This manual is issued for guidance only and does
not affect our standard terms and conditions and
our Product Limited Warranty, all of which are
available on request.
WARNING
The relief valve must be isolated from tank
pressure before servicing. All gas/vapour must
be blocked and pressure safely vented. Wear
appropriate protective clothing and breathing
apparatus if hazardous gas/vapours are present.
Use appropriate lifting equipment where required.
3 OPERATION
The Anderson Greenwood 4142HF PRV is a
direct acting vent valve based on the weight of
the pallet to keep the valve closed. When tank
pressure acting on the seat sealing area equals
the opposing force acting on the pallet, the
valve is on the threshold of opening. Any further
increase in pressure will cause the pressure
pallet to lift allowing the contents of the tank to
vent through the valve (out-breathing).
In order for the valve to open and achieve its
design lift, an overpressure will be required.
The 4142HF PRV has been designed to achieve
this design lift and rated capacity within 10%
overpressure. Since the weight on the pallet
determines the set pressure of the valve, the
settings are changed by varying the weight on
the pallet.
2 GENERAL DESCRIPTION
The Anderson Greenwood 4142HF PRV is
employed in gas/vapour service applications
for low pressure storage tanks, vessels or
applications requiring low pressure protection
with high capacity flow requirements. This
product helps to prevent damage to the tank
and also prevents the tank’s contents from
escaping, ensuring the safety of personnel and
the surrounding environment.
Pressure relief valves are designed to limit the
maximum pressure that can exist in a tank due
to inflow of the tank contents or due to changes
in temperature as a result of environmental
conditions.
• For ease of maintenance, both pressure and
vacuum seats are removable.
• Polytetrafluoroethylene (PTFE) coated
internals are supplied as an all-weather
option.

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ANDERSON GREENWOOD 4142HF PRESSURE RELIEF VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
4 SET PRESSURE VERIFICATION
If the pressure setting is to be verified prior to
installation, it is recommended that a test rig
with a suitable accumulator be used having the
following general features:
• Connection to the accumulator tank should
ensure a negligible pressure drop between
the accumulator and the test valve.
• Observed pressure shall be measured in the
accumulator tank.
• The flange on which the valve is mounted
shall be level.
• The valve should be tested using clean air or
nitrogen.
Remove valve from shipping container and
remove all packaging. Check that the pressure
setting, the rated capacity and other details on
the nameplate are correct.
4.1 Set Pressure Verification
For set pressure verification, the test apparatus
needs to limit the maximum flow rate into
the accumulator such that a pressure drop
measured in the accumulator can be observed
when the valve set pressure is reached.
1. Ensure that the test rig is clean and fasten
the valve securely to the test flange.
2. Check nameplate for required set pressure.
3. Increase the inlet pressure slowly until the
pallet assembly can be seen to be gently
lifting and reseating on the seat. The inlet
pressure at this point is the adjusted set
pressure and should coincide with the point
at which no further rise in inlet pressure
is observed. Repeat a further two times to
ensure repeatability.
4.2 Set Pressure Adjustment (See Figure 1)
The valve has been factory set to the required
setting, however, if it is necessary to make a
set pressure adjustment this can be done as
follows:
1. Remove hex set screws [7] and washers [5]
then remove cover [2] and O-ring [8].
2. The set pressure can be increased or
reduced by adding or removing lead weights
which can be supplied in various settings.
3. Refit cover [2] ensuring O-ring [8] is correctly
installed and secure using hex set screw [7]
and washers [5].
CAUTION
Whenever the cover is removed and re fitted,
ensure correct engagement of the pallet stem in
the weather hood guide tube.
4. Repeat set pressure verification as per 4.1
and repeat set pressure adjustment if
required.
If it is not possible to verify the set pressure on
a test rig, the required setting can be verified
by measuring the combined weight of the pallet
and installed weights. Refer to Table 4 for
combined weight and equivalent set pressures.
5 INSTALLATION
The mating connection to the tank should be
flat machined horizontal flange and should be
thoroughly cleaned to remove all foreign matter
which could lead to valve leakage if trapped
between the valve seat and the pallet. The bore
diameter of the tank connection nozzle should
be at least equal to the inlet bore of the valve
connection. For correct valve operation, all
discharge piping shall be adequately supported
and there shall be no external loads applied to
the valve body.
Fit an inlet gasket to the mating flange
ensuring it does not obstruct the flow path
and install the valve. Ensure that the main axis
of the valve is perpendicular. Flange bolting
should be tightened uniformly to ensure a good
seal.
For valves of aluminium construction,
appropriate flat face flanges should be used
and a full face gasket fitted.
NOTE:
Storage tank inlet piping configurations should
conform to recognised standards. Different
configurations will develop different inlet pressure
losses when the valve is flowing. This should be
taken into consideration when sizing the valve for
the application.
It is recommended that the external surfaces
of carbon steel valves are painted immediately
after installation.
Any discharge pipework should be adequately
supported to prevent any loads being applied
to the valve body and should have adequate
drainage to prevent accumulation of liquids on
the downstream side.
Discharge pipework must be at least equal in
size to the valve outlet and any built up back
pressure in the discharge line should be limited
to 10% of the valve set pressure.
Discharge lines should be positioned so as
to allow safe disposal of tank contents under
relief conditions.

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ANDERSON GREENWOOD 4142HF PRESSURE RELIEF VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
6 MAINTENANCE
Regular inspection should be carried out to
ensure that the pressure port is free from
debris and that nothing preventing the correct
operation of the valve is present. Maintenance
should be performed at regular intervals and
should be carried out by suitably qualified
personnel in an appropriately equipped
workshop. Alternatively, the valve should
be returned to the manufacturer or suitably
authorized agent for service/repair. During
transport to the workshop the valve should
be kept vertical to prevent damage to the
internals.
WARNING
The relief valve must be isolated from tank
pressure before servicing or removing. All gas/
vapour must be blocked and pressure safely
vented. Wear appropriate protective clothing and
breathing apparatus if hazardous gas/vapours
are present.
6.1 Valve Disassembly (For reference
numbers, see Figure 1)
Before the valve is disassembled it should be
thoroughly cleaned to remove potential hazards
from process contamination.
1. Seat Assembly
• Remove hex set screws [7], washers [5],
cover [2] and O-ring [8]. Remove shroud
[3.4] and lift out pallet assembly [10]
complete with pressure setting weights
(for higher set valves, remove some of the
lead before lifting out the pallet assembly).
• Remove seat [3.1] complete with guide
posts [3.2] by removing cap-screws [4].
This will separate the upper body [1] from
the inlet flange [9]. Remove gasket [6] and
O-ring [3.3].
6.2 Pallet Assemblies (For reference
numbers, see Figure 2)
1. VLP/LP Pallet assembly 2”, 3”, 4”
Remove nut [4] and washer, where used [5],
to release stem [3] from assembly. Separate
pallet disc [2], diaphragm [6], pallet [1] and
any weights taking care to identify weights
removed to help re-assembly.
2. VLP/LP Pallet assembly 6”, 8”, 10”, 12”
Remove nut [4] and washer [5] to release
stem [3] from assembly. Separate pallet
disc [2], diaphragm [6], backing disc [7],
spacer disc [8], pallet [1] and any weights
taking care to identify weights removed to
help re-assembly.
3. HP Pallet assembly 2”, 3”, 4”, 6”
Remove nut [4] and washer [5] to release
stem [3] from assembly. Separate pallet
disc [2], diaphragm [6], backing disc [7],
spacer disc [8], disc [9], pallet [1] and any
weights taking care to identify weights
removed to help re- assembly.
4. HP Pallet assembly 8”, 10”, 12”
Remove nut [4] and washer [5] to release
stem [3] from assembly. Separate pallet disc
[2], diaphragm [6], backing disc [7], spacer
disc [8], disc [9], pallet [1], support plate
[10] and any weights taking care to identify
weights removed to help re- assembly.

5
ANDERSON GREENWOOD 4142HF PRESSURE RELIEF VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
FIGURE 1
Valve General Assembly
PARTS LIST
Item No. Description
1Upper Body
2Cover
3Seat Assembly
3.1 Seat
3.2 Vacuum Post
3.3 O-ring
3.4 Shroud
4Capscrew
5Washer
6Body Gasket
7Hex Set Screw
8O-ring
9Inlet Flange
10 Pallet Assembly

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ANDERSON GREENWOOD 4142HF PRESSURE RELIEF VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
6.3 Valve Refurbishment
With valve in component parts thoroughly clean
all surfaces with a suitable solvent and check
for wear, corrosion or other forms of damage.
Particular attention should be given to the
sealing face of the valve seat.
Sealing Face
Slight damage can be removed by lapping the
seat face (removing guide posts); however, care
should be taken not to increase the width of
the seat face beyond those given in table 1. If
successive refurbishments or severe damage
requires the seat to be re-machined, consult
the factory for approved dimensions.
Discard and replace any damaged parts plus all
soft goods including:
• O-rings
• Diaphragms
• Backing Disks
• Spacer Disks
• Gasket
Also discard and replace the pallet disc.
See table 5 for replacement parts.
6.4 Pallet Reassembly (For reference
numbers , see Figure 2)
1. VLP/LP Pallet assembly 2”, 3”, 4”
Assemble pallet [1], diaphragm [6], and
pallet disc [2], to stem [3] and secure using
washer where used [5], and nut [4].
2. VLP/LP Pallet assembly 6”, 8”, 10”, 12”
Assemble pallet [1], spacer disc [8], backing
disc [7], diaphragm [6], and pallet disc [2],
to stem [3] and secure using washer [5] and
nut [4].
3. HP Pallet assembly 2”, 3”, 4”, 6”
Assemble pallet [1], disc [9], spacer disc [8],
backing disc [7], diaphragm [6], and pallet
disc [2], to stem [3] and secure using washer
[5] and nut [4].
4. HP Pallet assembly 8”, 10”, 12”
Assemble support plate [10], pallet [1],
disc [9], spacer disc [8], backing disc [7],
diaphragm [6], and pallet disc [2], to stem [3]
and secure using washer [5] and nut [4].
If required, PTFE tape can be applied to stem
threads and locking compound used to secure
the nut.
TABLE 1 - SEAT LAP BANDWIDTHS
Valve Size,
In. (mm)
Nominal Width
mm
Max Width
mm
2 (50)
1.0
1.5
3 (75) 1.0 1.5
4 (100) 1.2 1.8
6 (150) 1.5 1.8
8 (200) 1.5 2.2
10 (250) 2.0 3
12 (300) 2.0 3
6.5 Valve Re-assembly
Re-assemble guide posts [3.2] (if removed)
and O-ring [3.3] to seat [3.1]. Fit new gasket
[6] between upper body [1] and inlet flange [9].
Secure seat [3.1] and
upper body [1] to inlet flange [9] using cap-
screws [4]
ensuring that O-ring is not dislodged during
assembly.
Re install pallet ensuring the pallet slides easily
between the guide posts. Return setting weights.
Assemble shroud [3.4] which should be installed
over the guide posts [3.2] before the cover is
assembled.
Assemble O-ring [8] to cover [2], assemble
cover to upper body [1] ensuring that O-ring is
not dislodged during assembly. Secure using
washers [5], and hex set screws [7].
CAUTION
Whenever the cover is removed and re-fitted,
ensure correct engagement of the pallet stem.

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ANDERSON GREENWOOD 4142HF PRESSURE RELIEF VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
7 TESTING SET PRESSURE
The pressure setting should be checked and if
necessary adjusted as described in section 4.
8 PALLET IDENTIFICATION
The pressure setting should be checked and if
necessary adjusted as described in section 4.
1. Pressure Ranges
There are three pallet designs with the
following designations which each cover the
respective pressure ranges given in table 3.
• VLP This is a plain spun pallet suitable for
very low pressures.
• LP This is simillar to the VLP pallet appart
from the material thickness and is
suitable for slightly higher pressure.
See table 3 for comparison of material
thicknes.
• HP This construction uses a substantial
disc in combination with a spun pallet
and is suitable for use up to the highest
pressures.
TABLE 2 - PALLET THICKNESS
PALLET MATERIAL THICKNESS (mm)
2" 3" 4" 6" 8" 10" 12"
LP 1.0 1.0
1.0 1.5 1.5
1.5 1.5
VLP 0.6 0.6 0.6 0.6 0.6 0.6 0.6
Note the 2", 3' and 4" VLP and LP designs
contain a recess in the pallet to act as an air
cushion to assist seat tightness.
Note the 8” 10” and 12” HP pallets also use
a pallet support plate on the back face of the
pallet.
VLP / LP PALLET 2", 3" AND 4" HP PALLET 2", 3", 4" AND 6"
VLP / LP PALLET 6", 8", 10" AND 12" HP PALLET 8", 10" AND 12"
TABLE 3 - PALLET PRESSURE RANGES
Size,
In. (mm) Trim Material VLP Pallet LP Pallet HP Pallet
Min Max Min Max Min Max
2 (50) Aluminum 1.2 2.4 2.4 7.0 7.0 100
316 SST 2.5 5.6 5.6 14.0 14.0 100
3 (75) Aluminum 1.1 1.6 1.6 7.0 7.0 100
316 SST 2.5 3.7 3.7 140 140 100
4 (100) Aluminum 1.1 1.5 1.5 7.0 7.0 100
316 SST 2.5 3.4 3.4 14.0 14.0 100
6 (150) Aluminum 1.1 1.9 1.9 7.0 7.0 100
316 SST 2.5 4.2 4.2 140 140 100
8 (200) Aluminum 1.1 2.2 2.2 12 12 100
316 SST 2.5 4.5 4.5 20 20 100
10 (250) Aluminum 1.1 2.1 2.1 13 13 100
316 SST 2.5 4.3 4.3 22 22 100
12 (300) Aluminum 1.1 2.0 2.0 14 14 100
316 SST 2.5 4.1 4.1 24 24 100

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ANDERSON GREENWOOD 4142HF PRESSURE RELIEF VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
FIGURE 2
Pallet Construction
Pallet [1] Spacer Disc (8)
Backing Disc (7)
Diaphragm (6)
Pallet Disc (2)
Diaphragm [6]
Pallet Disc [2]
VERY LOW PRESSURE (VLP) AND LOW PRESSURE (LP) 2", 3", 4"
HIGH PRESSURE (HP) 2", 3", 4", 6" HIGH PRESSURE (HP) 8", 10", 12"
VERY LOW PRESSURE (VLP) AND LOW PRESSURE (LP) 6", 8", 10", 12"
Pallet [1]
Note: Washer item [5] not fitted to 2" and 3" VLP/LP
Pallet [1] Pallet [1]
Support Plate [10]
Disc [9] Disc [9]
Space Disc [8] Space Disc [8]
Backing Disc [7] Backing Disc [7]
Diaphragm [6] Diaphragm [6]
Pallet Disc [2] Pallet Disc [2]

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ANDERSON GREENWOOD 4142HF PRESSURE RELIEF VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
TABLE 4 - EQUIVALENT WEIGHTS FOR PRESSURE SETTINGS
Inlet Size 2" 3" 4" 6" 8" 10" 12"
Mean Sealing Area (in2)4.53 9.971 17.603 39.662 69.829 109.563 156.894
Setting (mbar) lb oz lb oz lb oz lb oz lb oz lb oz lb oz
1 0 1.1 02.3 04.1 09.2 10.2 19.4 24.4
2 0 2.1 04.6 08.2 12.4 20.4 32.9 48.9
3 0 3.2 06.9 012.3 111.6 30.6 412.3 613.3
4 0 4.2 09.3 10.4 24.8 40.9 65.8 91.7
5 0 5.3 011.6 14.4 214.0 51.1 715.2 11 6.2
6 0 6.3 013.9 18.5 37.3 61.3 98.7 13 10.6
7 0 7.4 10.2 112.6 40.5 71.5 11 2.1 15 15.0
8 0 8.4 12.5 20.7 49.7 81.7 12 11.5 18 3.5
9 0 9.5 14.8 24.8 52.9 91.9 14 5.0 20 7.9
10 010.5 17.2 28.9 512.1 10 2.2 15 14.4 22 12.3
12 012.6 111.8 31.1 614.5 12 2.6 19 1.3 27 5.2
14 014.7 20.4 39.2 80.9 14 3.0 22 4.2 31 14.1
16 10.8 25.0 41.4 93.4 16 3.5 25 7.1 36 6.9
18 12.9 29.7 49.6 10 5.8 18 3.9 28 10.0 40 15.8
20 15.0 214.3 51.8 11 8.2 20 4.3 31 12.9 45 8.7
22 17.1 32.9 59.9 12 10.6 22 4.8 34 15.7 50 1.5
24 19.2 37.6 62.1 13 13.1 24 5.2 38 2.6 54 10.4
26 111.3 312.2 610.3 14 15.5 26 5.6 41 5.5 59 3.3
28 113.5 40.8 72.5 16 1.9 28 6.0 44 8.4 63 12.2
30 115.6 45.5 710.6 17 4.3 30 6.5 47 11.3 68 5.0
32 21.7 410.1 82.8 18 6.7 32 6.9 50 14.2 72 13.9
34 23.8 414.7 811.0 19 9.2 34 7.3 54 1.1 77 6.8
36 25.9 53.4 93.2 20 11.6 36 7.8 57 3.9 81 15.6
38 28.0 58.0 911.3 21 14.0 38 8.2 60 6.8 86 8.5
40 210.1 512.6 10 3.5 23 0.4 40 8.6 63 9.7 91 1.4
42 212.2 61.2 10 11.7 24 2.8 42 9.1 66 12.6 95 10.2
44 214.3 65.9 11 3.9 25 5.2 44 9.5 69 15.5 100 3.1
46 30.4 610.5 11 12.0 26 7.7 46 9.9 73 2.4 104 12.0
48 32.5 615.1 12 4.2 27 10.1 48 10.4 76 5.3 109 4.8
50 34.6 73.8 12 12.4 28 12.5 50 10.8 79 8.1 113 13.7
52 36.7 78.4 13 4.6 29 14.9 52 11.2 82 11.0 118 6.6
54 38.8 713.0 13 12.7 31 1.4 54 11.6 85 13.9 122 15.4
56 310.9 81.7 14 4.9 32 3.8 56 12.1 89 0.8 127 8.3
58 313.0 86.3 14 13.1 33 6.2 58 12.5 92 3.7 132 1.2
60 315.1 810.9 15 5.3 34 8.6 60 12.9 95 6.6 136 10.0
62 41.2 815.6 15 13.4 35 11.0 62 13.4 98 9.5 141 2.9
64 43.3 94.2 16 5.6 36 13.5 64 13.8 101 12.3 145 11.8
66 45.4 98.8 16 13.8 37 15.9 66 14.2 104 15.2 150 4.6
68 47.5 913.5 17 6.0 39 2.3 68 14.7 108 2.1 154 13.5
70 49.6 10 2.1 17 14.1 40 4.7 70 15.1 111 5.0 159 6.4
72 411.7 10 6.7 18 6.3 41 7.1 72 15.5 114 7.9 163 15.2
74 413.8 10 11.3 18 14.5 42 9.6 74 16.0 117 10.8 168 8.1
76 415.9 10 16.0 19 6.7 43 12.0 77 0.4 120 13.7 173 1.0
78 52.1 11 4.6 19 14.8 44 14.4 79 0.8 124 0.5 177 9.9
80 54.2 11 9.2 20 7.0 46 0.8 81 1.3 127 3.4 182 2.7
82 56.3 11 13.9 20 15.2 47 3.2 83 1.7 130 6.3 186 11.6
84 58.4 12 2.5 21 7.4 48 5.7 85 2.1 133 9.2 191 4.5
86 510.5 12 7.1 21 15.5 49 8.1 87 2.6 136 12.1 195 13.3
88 512.6 12 11.8 22 7.7 50 10.5 89 3.0 139 15.0 200 6.2
90 514.7 13 0.4 22 15.9 51 12.9 91 3.4 143 1.9 204 15.1
92 60.8 13 5.0 23 8.1 52 15.4 93 3.8 146 4.7 209 7.9
94 62.9 13 9.7 24 0.3 54 1.8 95 4.3 149 7.6 214 0.8
96 65.0 13 14.3 24 8.4 55 4.2 97 4.7 152 10.5 218 9.7
98 67.1 14 2.9 25 0.6 56 6.6 99 5.1 155 13.4 223 2.5
100 69.2 14 7.5 25 8.8 57 9.0 101 5.6 159 0.3 227 11.4

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ANDERSON GREENWOOD 4142HF PRESSURE RELIEF VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
TABLE 5 - REPLACEMENT PARTS (REFER TO FIGURES 1 AND 2)
Description Ref Usage Material
Nominal Size
2" 3" 4" 6" 8" 10" 12"
Pallet Disc Fig 2 [2]
Very low pressure Stainless steel 809736-228 809742-228 809748-228 809754-228 809760-228 809766-228 809772-228
Low pressure Stainless steel 809397-228 809398-228 809399-228 809400-228 809443-228 809506-228 809522-228
High pressure Stainless steel 809397-228 809398-228 809399-228 809400-228 809443-228 809506-228 809522-228
Diaphragm Fig 2 [6]
Very low pressure PFA 810044-574 810046-574 810048-574 809589-574 809592-574 809595-574 809598-574
PTFE 809580-A29 809583-A29 809586-A29 809589-A29 809592-A29 809595-A29 809598-A29
Low pressure PFA 810045-574 810047-574 810049-574 810314-574 810316-574 810318-574 810320-574
PTFE 809581-A29 809584-A29 809587-A29 810314-A29 810316-A29 810318-A29 810320-A29
High pressure PTFE 809582-A29 809585-A29 809588-A29 809591-A29 809594-A29 809597-A29 809600-A29
Backing Disc Fig 2 [7]
Very low pressure Gen Service N/A N/A N/A 809989-447 810050-447 810051-447 810052-447
Low pressure Gen Service N/A N/A N/A 810313-447 810315-447 810317-447 810319-447
High pressure Gen Service 809601-447 809602-447 809630-447 809604-447 809605-447 809606-447 809607-447
Spacer Disc Fig 2 [8]
Very low pressure Gen Service N/A N/A N/A 809990-447 810053-447 810054-447 810055-447
Low pressure Gen Service N/A N/A N/A 809611-447 809612-447 809613-447 809614-447
High pressure Gen Service 809608-447 809609-447 809610-447 809611-447 809612-447 809613-447 809614-447
Body Gasket Fig 1 [6] HC501F Gen Service 809401-447 809402-447 809403-447 808422-447 809444-447 809507-447 809523-447
O-ring
Fig 1 [3.3] Seat
Viton 809702-504 809703-504 809632-504 800397-504 809634-504 807878-504 800386-504
Nitrile 809702-503 809703-503 809632-503 800397-503 809634-503 807878-503 800386-503
PTFE 809702-502 809703-502 809632-502 800397-502 809634-502 807878-502 800386-502
Fig 1 [8] Cover
Viton 809630-504 809631-504 809633-504 809634-504 809640-504 809641-504 809642-504
Nitrile 809630-503 809631-503 809633-503 809634-503 809640-503 809641-503 809642-503
PTFE 809630-502 809631-502 809633-502 809634-502 809640-502 809641-502 809642-502
When ordering replacement parts, specify
relief valve by model number, pipe size and
serial number. Identify replacement parts by
part number, description and material where
possible.
WARNING
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.
The information and technical data contained in this document are subject to change without notice.
Emerson Automation Solutions Final Control UK Ltd does not warrant that the specifications are
current and assumes no responsibility for the use or misuse thereof. The purchaser should verify that
there have been no changes to the specifications prior to use.
VCIOM-16471-EN © 2021 Emerson Electric Co. All rights reserved 05/21. Anderson Greenwood is a mark owned by one of the companies in the Emerson Automation
Solutions business unit of Emerson Electric Co. The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their
prospective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be
construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed
by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time
without notice.
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