EMERSON ENARDO ES 850 User Manual

Instruction Manual  
D104632X012  
Enardo ES-850 and Enardo ES-950 Series  
December 2021  
Enhanced Sealing Enardo ES-850 and  
Enardo ES-950 Series Pressure/Vacuum  
Relief Valve (ATEX Approved)  
P1854  
MODEL EnARDO ES-850  
MODEL EnARDO ES-850  
P1854  
MODEL EnARDO ES-950  
MODEL EnARDO ES-950  
Figure 1. Enardo ES-850 and Enardo ES-950 Series  
Figure 2. Enardo ES-850 and Enardo ES-950 Series  
Pressure/Vacuum Relief Valve  
with Smart Wireless option  
Table of Contents  
WARnInG  
Introduction...........................................................................2  
Specifications .......................................................................2  
Product Identification and Marking.......................................5  
Principle of Operation...........................................................5  
Installation ............................................................................8  
Maintenance....................................................................... 11  
Adjustments........................................................................14  
Valve Repair .......................................................................16  
Failure to follow these instructions or to  
properly install and maintain this equipment  
could result in an explosion, fire and/or  
chemical contamination causing property  
damage and personal injury or death.  
Fisher™ pressure/vacuum relief valve  
must be installed, operated and maintained  
in accordance with federal, state and  
local codes, rules and regulations,  
and Emerson Process Management  
Regulator Technologies Tulsa, LLC  
(Emerson) instructions. These units are not  
designed or intended for use in mobile, high  
vibration or high acceleration applications.  
Enardo ES-850 and Enardo ES-950 Series  
Model  
-
Inlet Size  
x
Outlet Size  
-
Housing Material  
1 = Aluminum  
Pallet and Seat Material  
Pallet Seal Material  
1 = FEP  
Body/Seat/Lid Seal Material  
-
Enardo ES-850  
2 to 12 in.  
3 to 14 in.  
2 = 316SST  
1 = PTFE Body and FEP  
Seat/Lid  
4 = 316SST  
2 = Nitrile (NBR)  
5 = Carbon Steel  
3 = Fluorocarbon (FKM)  
4 = Fluorosilicone (FVMQ)  
2 = Nitrile (NBR)  
3 = Fluorocarbon (FKM)  
4 = Fluorosilicone (FVMQ)  
Pressure Units  
z = oz./sq. in.  
n = in. w.c.  
mm = mm w.c.  
mb = mbar  
Pressure Setting  
/
Vacuum Units  
Vacuum Setting  
-
Weight Material  
-
Options  
0.5 to 32.0 oz./sq. in.  
0.86 to 55.0 in. w.c.  
22 to 1406 mm w.c.  
2.2 to 138 mbar  
z = oz./sq. in.  
n = in. w.c.  
mm = mm w.c.  
mb = mbar  
0.5 to 32.0 oz./sq. in.  
0.86 to 55.0 in. w.c.  
22 to 1406 mm w.c.  
2.2 to 138 mbar  
C = CS ZP  
S = SST  
L = Lead  
0 = No Options  
F = Flat Face Flange (standard for Alumunim)  
R = Raised Face Flange (standard for CS, SS)  
X = Epoxy Coating  
W1 = Wireless Pressure and Vacuum Monitoring  
W2 = Wireless Pressure Monitoring Only  
W3 = Wireless Vacuum Monitoring Only  
W4 = Wired Pressure and Vacuum Monitoring  
W5 = Wired Pressure Monitoring Only  
W6 = Wired Vacuum Monitoring Only  
MODEL EnARDO ES-850 PRESSURE/VACUUM RELIEF VALVE MODEL nUMBER  
Model  
-
Inlet Size  
-
Housing Material  
1 = Aluminum  
Pallet and Seat Material  
2 = 316SST  
Pallet Seal Material  
1 = FEP  
Body/Seat/Lid Seal Material  
-
Enardo ES-950  
2 to 12 in.  
1 = PTFE Body and FEP Seat/Lid  
2 = Nitrile (NBR)  
4 = 316SST  
2 = Nitrile (NBR)  
5 = Carbon Steel  
3 = Fluorocarbon (FKM)  
4 = Fluorosilicone (FVMQ)  
3 = Fluorocarbon (FKM)  
4 = Fluorosilicone (FVMQ)  
Pressure Units  
z = oz./sq. in.  
n = in. w.c.  
mm = mm w.c.  
mb = mbar  
Pressure Setting  
/
Vacuum Units  
z = oz./sq. in.  
n = in. w.c.  
mm = mm w.c.  
mb = mbar  
Vacuum Setting  
-
Weight Material  
C = CS ZP  
S = SST  
L = Lead  
-
Options  
0.5 to 32.0 oz./sq. in.  
0.86 to 55.0 in. w.c.  
22 to 1406 mm w.c.  
2.2 to 138 mbar  
0.5 to 32.0 oz./sq. in.  
0.86 to 55.0 in. w.c.  
22 to 1406 mm w.c.  
2.2 to 138 mbar  
0 = No Options  
F = Flat Face Flange (standard for Alumunim)  
R = Raised Face Flange (standard for CS, SS)  
X = Epoxy Coating  
W1 = Wireless Pressure and Vacuum Monitoring  
W2 = Wireless Pressure Monitoring Only  
W3 = Wireless Vacuum Monitoring Only  
W4 = Wired Pressure and Vacuum Monitoring  
W5 = Wired Pressure Monitoring Only  
W6 = Wired Vacuum Monitoring Only  
MODEL EnARDO ES-950 PRESSURE/VACUUM RELIEF VALVE MODEL nUMBER  
Figure 3. Pressure/Vacuum Relief Valve Model Number  
MODEL EnARDO ES-850  
MODEL EnARDO ES-851  
MODEL EnARDO ES-950  
MODEL EnARDO ES-951  
MODEL EnARDO ES-952  
MODEL EnARDO ES-953  
Figure 4. Enardo ES-850 and Enardo ES-950 Series Pressure/Vacuum Relief Valve Available Models  
3
Enardo ES-850 and Enardo ES-950 Series  
Table 1. Model Enardo ES-850 Weights(1)  
WEIGHT OF CALIBRATIOn WEIGHTS REQUIRED TO  
WEIGHT  
WEIGHT  
ACHIEVE DESIRED RELIEF SETTInG(2)(3)  
InLET COnnECTIOn  
OUTLET COnnECTIOn  
(STAInLESS STEEL OR  
(ALUMInUM)  
CARBOn STEEL)  
Weight per oz/sq. in.  
Weight per in. w. c.  
In.  
2
mm  
50  
In.  
3
mm  
80  
Lb  
kg  
13  
14  
15  
26  
28  
32  
73  
75  
78  
79  
94  
Lb  
80  
kg  
36  
Lb  
0.9  
0.9  
0.9  
2.3  
2.3  
2.3  
7.8  
7.8  
7.8  
7.8  
7.8  
kg  
0.3  
0.3  
0.3  
1.0  
1.0  
1.0  
3.5  
3.5  
3.5  
3.5  
3.5  
Lb  
0.5  
0.5  
0.5  
1.3  
1.3  
1.3  
4.5  
4.5  
4.5  
4.5  
4.5  
kg  
0.2  
0.2  
0.2  
0.6  
0.6  
0.6  
2.0  
2.0  
2.0  
2.0  
2.0  
29  
31  
3
80  
3
80  
85  
39  
3
80  
4
100  
150  
150  
200  
250  
250  
300  
300  
350  
33  
90  
41  
4
100  
150  
150  
200  
250  
250  
300  
300  
6
57  
144  
155  
178  
485  
503  
525  
532  
622  
65  
6
6
62  
70  
6
8
70  
81  
8
10  
10  
12  
12  
14  
161  
166  
172  
175  
208  
220  
228  
238  
241  
282  
10  
10  
12  
12  
1. Unit weights indicate Net Weight of valve in pounds and kilograms at standard set pressure (0.5 oz/sq. in. pressure – 0.5 oz/sq. in. vacuum). It does not include shipping crate or box.  
2. Multiply the relief setting by the value shown to determine the weight of the calibration weights used to achieve the desired relief setting.  
3. Values shown for calibration weights are for reference purposes only. They are not intended to be used for determination of valve relief setting.  
Table 2. Model Enardo ES-950 Weights(1)  
WEIGHT OF CALIBRATIOn WEIGHTS REQUIRED TO ACHIEVE  
WEIGHT  
(STAInLESS STEEL OR  
CARBOn STEEL)  
DESIRED RELIEF SETTInG(2)(3)  
WEIGHT  
(ALUMInUM)  
InLET COnnECTIOn  
Weight per oz/sq. in.  
Weight per in. w. c.  
In.  
2
mm  
50  
Lb  
21  
kg  
10  
10  
19  
20  
56  
59  
65  
Lb  
54  
kg  
24  
Lb  
0.9  
0.9  
2.3  
2.3  
7.8  
7.8  
7.8  
kg  
0.3  
0.3  
1.0  
1.0  
3.5  
3.5  
3.5  
Lb  
0.5  
0.5  
1.3  
1.3  
4.5  
4.5  
4.5  
kg  
0.2  
0.2  
0.6  
0.6  
2.0  
2.0  
2.0  
3
80  
23  
58  
26  
4
100  
150  
200  
250  
300  
41  
110  
123  
362  
383  
405  
50  
6
45  
56  
8
123  
129  
144  
164  
174  
184  
10  
12  
1. Unit weights indicate Net Weight of valve in pounds and kilograms at standard set pressure (0.5 oz/sq. in. pressure – 0.5 oz/sq. in. vacuum). It does not include shipping crate or box.  
2. Multiply the relief setting by the value shown to determine the weight of the calibration weights used to achieve the desired relief setting.  
3. Values shown for calibration weights are for reference purposes only. They are not intended to be used for determination of valve relief setting.  
The following are a few specific examples of how this added  
visibility can help prevent problems:  
Smart Wireless Monitoring Option  
Example #1 – Redundant PVRVs  
WARnInG  
Redundant PVRVs are commonly used for added safety. If  
the primary PVRV fails closed or partially-closed, then the  
backup PVRV automatically takes over. This is achieved by  
establishing a pressure set point that is slightly higher for  
the backup device. In this way, if the primary PVRV fails, the  
tank remains protected. But redundancy is lost and should  
The surface resistivity of the antenna  
assembly when the optional transmitter  
is installed is greater than 1 GΩ. To avoid  
electrostatic charge build up, it must not be  
rubbed or cleaned with solvents or dry cloth.  
be addressed as soon as possible. But how will you know  
if this has occurred? Monitoring the open/closed position  
of the backup PVRV can provide quick identification of this  
issue, for either the pressure or vacuum side. Under normal  
conditions, the backup PVRV remains closed. If the backup  
PVRV is open, this points to either the primary PVRV not  
functioning as expected or a separate pressure control  
problem in the tank system that is causing both PVRVs to  
be open. Ideally, the wireless monitoring of both primary and  
backup devices is preferred in order to gain the most insight.  
Further troubleshooting can then be performed and the  
problem can be detected and addressed.  
The Smart Wireless Monitoring Option is available  
with PVRV Models Enardo ES-850 (Pipe-away) and  
Enardo ES-950 (Vent-to-atmosphere). This option allows the  
remote sensing and “OPEN/CLOSED” value transmission  
of the open or closed status of the pressure vent, the  
vacuum vent or both. Use Option Code WP for pressure vent  
monitoring, Option Code WV for vacuum vent monitoring  
or WPV for the monitoring of both at the end of the model  
string. Knowing whether a PVRV is open or closed can  
enable immediate response to prevent problems related to  
safety, emissions and quality of the tank contents.  
4
Enardo ES-850 and Enardo ES-950 Series  
OUTER HOUSInG OF STAInLESS STEEL,  
CARBOn STEEL OR COATED ALUMInUM  
II 1 G Ex h IIC T6 Ga  
OUTER HOUSInG OF  
UnCOATED ALUMInUM  
II 2 G Ex h IIC T6 Gb  
Figure 6. Product Identification and Marking  
Hazardous Locations  
Fisher™ pressure/vacuum relief valves are available with  
outer housings of carbon steel, stainless steel or aluminum,  
as indicated in Figure 6.  
PRESSURE FLOW  
nameplate  
A nameplate is attached to the valve and contains the  
following information:  
• Model number – Ex. ES-950-8-5211  
• Size – Ex. 8 in.  
• Serial number  
• Tag number (Optional)  
VACUUM FLOW  
Figure 5. Pressure and Vacuum Flow  
Example #2 – Tank Blanketing  
Notified Body Number – Ex. 2460  
• Cat. no. (Category number) –  
- Category 1 – Stainless steel, Carbon steel or  
Coated aluminum vent  
- Category 2 – Uncoated aluminum vents  
• Date – Date of Manufacture  
Certificate – Ex. PRESAFE 17 ATEX 10273X  
• Pressure Setting and Flow Rate  
- Setting – Ex. Z4.0  
- Flow Rate SCFH (Air) – Ex. 00000  
• Vacuum Setting and Flow Rate  
- Setting – Ex. Z0.5  
Tank blanketing is sometimes used in order to inert the vapor  
space in a tank for added safety. A tank blanketing regulator  
controls the inflow of nitrogen or another blanketing gas  
by responding to a low pressure set point. In this scenario,  
a PVRV (vacuum side) generally acts as a backup to the  
blanketing regulator. If the blanketing system fails for some  
reason, the PVRV automatically takes over, as its set point is  
slightly higher than that of the regulator. But once again, how  
is one to know that this has occurred? A wireless-monitored  
PVRV would indicate that the vacuum side is open. Under  
normal operation, it should be closed.  
- Flow Rate SCFH (Air) – Ex. 00000  
Example #3 – Emergency Vent  
Principle of Operation  
A storage tank’s emergency vent should remain closed,  
except in abnormal conditions. If an emergency vent is also  
remotely monitored, and found to be open, then there may  
be a pressure control issue somewhere in the system. In this  
scenario, the PVRV should also be open. If it is not, it could  
be part of the issue. Again, a wireless-monitored PVRV can  
readily provide this information.  
Enardo ES-850 and Enardo ES-950 Series  
The Enardo ES-850 and Enardo ES-950 Series pressure/  
vacuum relief valves maintain a tight seal until system  
pressure or vacuum exceeds the set pressure of the valve.  
Set pressure is determined by stacking a series of weights  
onto the valve pallet unless the pressure and vacuum set  
points have been specified for the minimum settings. When  
overpressure occurs, the weighted pallet lifts, breaking the  
seal between the seat and pallet. This allows vapors to pass  
through the valve orifice and relieve pressure buildup. The  
valve reseals upon relief and remains sealed.  
Product Identification and Marking  
CAUTIOn  
As part of the legacy Model Enardo 850/  
Enardo 950 ATEX certification, an  
It is important to know that relieving vapors near the set  
pressure in a continuous manner may cause the pallet to  
flutter or oscillate inside the valve chamber. This is common  
to products of this type. Operating the valve with flutter or  
oscillation may cause premature valve damage or wear over  
time. Fisher pressure/vacuum relief valve flow charts and  
sizing program results designate the “flutter zone” to assist  
with correct valve sizing. Contact your local Sales Office with  
any questions or additional assistance.  
ignition risk analysis was performed.  
Grounding of the unit is not deemed to be  
necessary because all conducting parts  
of the equipment are arranged such that  
a dangerous potential difference cannot  
exist between them. However, grounding or  
bonding allowances can be made at user  
request if internal, local or national codes or  
standards require.  
5
Enardo ES-850 and Enardo ES-950 Series  
LID AnD  
UPPER GUIDE  
LID O-RInG  
OUTLET FLAnGE  
PRESSURE CHAMBER  
LID AnD  
UPPER GUIDE  
VALVE PALLET  
VALVE SEAT  
VACUUM CHAMBER  
DRAIn PLUG  
VALVE PALLET STEM  
BODY ATTACHMEnT  
GASKET  
VALVE PALLET SEAL  
SEAT O-RInG  
InLET FLAnGE  
InSTALLATIOn STUD  
MODEL EnARDO ES-850 PIPE-AWAY PRESSURE/VACUUM RELIEF VALVE  
GUIDE BUSHInG  
UPPER GUIDE  
PRESSURE CHAMBER  
(ATMOSPHERE)  
VEnT ROD  
LID AnD  
UPPER GUIDE  
VALVE PALLET  
WEATHER  
HOOD  
VACUUM CHAMBER  
VALVE SEAT  
VALVE PALLET STEM  
VALVE PALLET SEAL  
VACUUM SEAT RETAInER  
InLET FLAnGE  
VACUUM SCREEn  
MODEL EnARDO ES-950 VEnT-TO-ATMOSPHERE PRESSURE/VACUUM RELIEF VALVE  
Figure 7. Models Enardo ES-850 and Enardo ES-950 Pressure/Vacuum Relief Valve Assembly  
6
Enardo ES-850 and Enardo ES-950 Series  
WIRELESS LID  
WIRELESS STEM  
TRAnSMITTER  
SEnSOR  
COnDUIT  
WIRELESS LID  
SEnSOR  
COnDUIT  
WIRELESS  
STEM  
Figure 8. Model Enardo ES-850 with Smart Wireless Option  
COnDUIT  
WIRELESS HOOD SEnSOR BRACKET  
SET SCREW  
SLEEVE  
TRAnSMITTER  
WIRELESS STEM  
WIRELESS LID  
COnDUIT  
VEnT ROD  
SEnSOR  
WIRELESS  
STEM  
Figure 9. Model Enardo ES-950 with Smart Wireless Option  
7
Enardo ES-850 and Enardo ES-950 Series  
Installation  
Enardo ES-850 and Enardo ES-950 Series  
WARnInG  
Take all necessary precautions and safety  
measures when lifting valves into place  
to prevent unbalanced load situations.  
Do not install calibration weights or pallet  
assemblies prior to mounting and installation  
of valve. Special care must be taken during  
installation to prevent damage to the seat  
sealing surface.  
CARDBOARD  
REMOVE CARDBOARD FROM PALLET STEMS  
Wear protective gloves and clothing  
to prevent skin contact when handling  
lead weights. Wear eye protection. Avoid  
breathing dust/fumes/mist/vapors/spray.  
Do not eat, drink or smoke while using the  
product. Avoid release to the environment.  
Wash hands with soap and water after  
handling. Keep away from excessive heat  
and open flames.  
note  
All product configurations use similar  
packing methods.  
2. Remove valve pallets from the unit. Separate the  
protective cardboard coverings from the pallet stems  
and seals. Gently clean the seal with a suitable solvent  
and lint free, nonabrasive cloth to remove any dirt/  
particles and achieve good seal tightness. Be careful not  
to damage the pallet seal surface.  
If lead weights need to be disposed of, follow  
all local, regional and national regulatory  
requirements for the safe and proper  
disposal of lead.  
Make sure line is free of hazardous vapors  
before installing or servicing the valve.  
Product material of construction can include  
aluminum, carbon steel and stainless steel.  
Care should be taken to avoid mechanical  
impacts that could result in a spark.  
1. Loosen fasteners on top of the valve and remove the lid,  
hood or guide.  
3. Reinsert uncovered valve pallets back into the unit.  
Make sure that the lower stem is being guided by the  
saber guides before lowering the pallet onto the seat  
to avoid hitting the seat sealing edge with an off-set  
pallet . If the pallet appears to be off-center to the  
valve chamber, or if there is difficulty positioning the  
lid or guide, carefully inspect the pallet to ensure it is  
inserted properly.  
4. Remove any protective flange covers.  
CARDBOARDS  
REMOVE CARDBOARD FROM PALLET STEMS  
8
Enardo ES-850 and Enardo ES-950 Series  
note  
CAUTIOn  
For more details on using weights  
to adjust the pallet setting, read the  
Adjustments section.  
Use care when installing weights and  
securing lids to avoid getting pinched.  
6. Install the covers and/or hood.  
CAUTIOn  
7. Re-use existing wing nuts or nuts and tighten to secure  
Use care when installing weights and  
securing lids to avoid getting pinched.  
covers/hoods in position.  
8. Attach the valve to the appropriate mating flange using  
appropriate flange gasket which is compatible with  
process conditions (customer provided). To ensure  
proper function, install the valve to a level surface,  
not greater than 1° off horizontal so the pallet will  
move vertically. Valves that are tilted during usage  
may suffer premature damage or wear, and may have  
more leakage.  
5. Reinstall pressure and/or vacuum pallet assemblies into  
their respective openings. Install the setting weights  
(if required) by engaging the hole in the weight on the  
appropriate pallet assembly stem.  
5.1. The weights are marked with their pressure  
equivalents and are shipped outside of the valve  
chamber. Verify that the appropriate weights are  
being installed to provide the specified pressure  
and/or vacuum setting. Refer to the nameplate data  
to verify the specified factory settings.  
For proper bolt torquing of the valve connecting flange to the  
piping, please refer to Tables 3 to 5.  
Smart Wireless Monitoring  
WARnInG  
Do not thread wireless sensor too far into  
lid. Sensor may contact pallet stem and  
prevent valve from opening properly. This  
condition may result in equipment damage or  
personal injury.  
Units with Smart Wireless are shipped as self-contained  
and already connected. The only connection required is  
installation of the transmitter battery (shipped separately)  
which is intrinsically safe and does not require a  
hot-work permit.  
1. Install valves with the Smart Wireless monitoring option  
in a similar manner to the standard PVRVs with a few  
differences. Remove any cardboard or other packaging  
from the inner chambers. Remove the lid(s) and/  
or hood to allow insertion of the appropriate weights  
during installation.  
5.2. To adjust valve settings higher than minimum,  
use the weights to increase the pressure setting.  
Weights are packed separately within the unit  
shipping package and are labelled “PRESSURE”  
and/or “VACUUM”. If weights are shipped with the  
unit, they should be installed onto the pallets in the  
valve chamber in which they are labelled. Gently  
slide the weights onto the pallet stem and down on  
top of the valve pallet.  
2. Remove any lid with the sensing equipment threaded  
into it as a single unit. The sensor should remain  
engaged with the lid during this process. Position all  
sensors within 0.100 in. of the pallet stem. Maintain  
this critical distance. If the sensor location within a lid is  
altered, re-test the unit to ensure proper functioning of  
the sensor and transmitter. If this is the case, re-apply  
thread sealant to mitigate any leakage of the sensor/  
lid interface.  
For 10 in. / 250 mm FEP pallets make sure to  
put the PTFE (Teflon®) spacer on top of the pallet  
before adding the weights.  
note  
Make sure that the pallet assembly stem  
positively engages the stem guide hole in the  
hood or cover. Each pallet assembly must be  
free to move upwards, with the pallet stem  
travelling into the stem guide.  
Teflon® is a mark owned by E.I. du Pont de Nemours and Co.  
9
Enardo ES-850 and Enardo ES-950 Series  
Table 3. Torque Specifications - Raised Face Flange, Steel Only  
nOMInAL PIPE DIAMETER  
nUMBER OF BOLTS  
BOLT DIAMETER, In.  
TORQUE, FT-LBS  
2
3
4
4
0.63  
0.63  
0.63  
0.75  
0.75  
0.88  
0.88  
1.00  
35  
60  
4
8
43  
6
8
80  
8
8
109  
101  
135  
168  
10  
12  
14  
12  
12  
12  
Assumptions: Use of SAE grade 5 bolts or studs or stronger. No lubricant. Compressed mineral fiber material or similar.  
Notes: If lubricant is used on bolts, apply torque reduction factor listed in Table 5. For best results, hardened steel washers should be used on all cast flange bolted connections.  
Table 4. Torque Specifications - Flat Face Flange, Steel or Aluminum  
nOMInAL PIPE DIAMETER  
nUMBER OF BOLTS  
BOLT DIAMETER, In.  
TORQUE, FT-LBS  
2
3
4
4
0.63  
0.63  
0.63  
0.75  
0.75  
0.88  
0.88  
1.00  
32  
47  
32  
49  
68  
69  
98  
138  
4
8
6
8
8
8
10  
12  
14  
12  
12  
12  
Assumptions: Use of SAE grade 5 bolts or studs or stronger. No lubricant. Elastomer <70 Durometer Shore A.  
Notes: Flat faced flanges should never be mated to a raised face flange for installation. If lubricant is used on bolts, apply torque reduction factor listed in Table 5. For best results,  
hardened steel washers should be used on all cast flange bolted connections.  
Table 5. Torque Reduction Factors per Lubricant  
DESCRIPTIOn  
Machine Oil  
COEFFICIEnT OF FRICTIOn  
MULTIPLY TORQUE VALUE In TABLE BY  
f = 0.15  
f = 0.12  
f = 0.11  
f = 0.10  
f = 0.06  
0.75  
0.60  
0.55  
0.50  
0.30  
API SA2 Grease  
Nickel-based Lubricant  
Copper-based Lubricant  
Heavy-Duty Lubricating Paste  
10  
Enardo ES-850 and Enardo ES-950 Series  
Figure 10. Model Enardo ES-850, Installation of Weights  
Figure 11. Model Enardo ES-950, Installation of Weights  
3. For the Model Enardo ES-950 PVRVs containing hoods,  
Avoid release to the environment. Wash hands  
with soap and water after handling. Keep  
away from excessive heat and open flames.  
Ensure that all proper safety procedures and  
safeguards are followed when working on units,  
especially if they are in the elevated position.  
the sensor is located at a proper distance away from  
the stem by using a sleeve, bracket and set screw. The  
sensor is held within the sleeve using two jam nuts.  
Fasten the sleeve to the hood using a bracket. Using  
a set screw, mate the bracket and sleeve to ensure  
that the sensor is in the proper location and cannot  
be adjusted. When installing weights, lift the hood and  
sensor/bracket/sleeve off the vent rods as one. Remove  
the sensor/bracket/sleeve from the hood and install the  
weights. Reverse the process to reassemble the hood  
and sensor.  
Make sure line is free of hazardous vapors  
before installing or servicing the valve.  
Observe all applicable safety requirements.  
Only qualified and trained personnel  
shall perform maintenance functions in  
hazardous locations.  
Maintenance  
Valves should be removed from the location  
having a potentially explosive atmosphere  
and taken to a safe location for repair  
and maintenance.  
Enardo ES-850 and Enardo ES-950 Series  
WARnInG  
CAUTIOn  
Wear protective gloves and clothing to prevent  
skin contact when handling lead weights. Wear  
eye protection. Avoid breathing dust/fumes/  
mist/vapors/spray. Do not eat, drink or smoke  
while using the product.  
When removing and installing seats, ensure  
to handle it with care to prevent damage  
(scratches, nicks, etc.) to the sealing surface.  
11  
Enardo ES-850 and Enardo ES-950 Series  
For preventive maintenance of the Fisher™ pressure/  
3. Inspect the pallets for any damage or buildup that  
vacuum relief valve, refer to the following instructions.  
may affect its sealing characteristics or its ability to  
move properly inside the valve. Gently clean the seal  
with a suitable solvent and lint free, nonabrasive  
cloth to remove any dirt/particles and achieve good  
seal tightness.  
1. Loosen the fasteners on top of the valve and remove  
the lid, hood or guide.  
4. Clear away any buildup on the weights or on  
the housing.  
2. Remove any valve pallets and weights from the unit.  
Keep in mind that these will be reinstalled, so keep track  
of the chamber from which they were removed.  
5. Inspect the valve seats installed in the unit. The sealing  
surfaces should be smooth and free of nicks or buildup.  
A good, clean seat sealing surface free from defects is  
essential to achieving a tight seal. Check the guides for  
anything that may keep the valve pallet from moving  
properly inside the valve. If necessary, gently clean the  
seats with a suitable solvent and nonabrasive cloth.  
12  
Enardo ES-850 and Enardo ES-950 Series  
6. If the valve has a lid, clean any buildup that may exist  
in or around the guide hole located in the center of  
the part.  
9. Reinstall weights onto their appropriate valve pallets.  
7. If the valve is fitted with a screen of some type, clear  
away any blockage that may impede proper flow.  
10. Replace any lid, hood or guide that was previously  
removed and fasten securely. When tightening down  
lids, make sure the O-ring in each lid has full contact  
with the sealing surface.  
11. For seat removal, see Figure 7 for the valve  
configuration drawings. The valve seats are installed in  
machined bores in both the upper body (pressure) and  
in the lower body (vacuum) and are fitted with O-ring  
seals. Remove the upper body seat by removing the  
upper body casting (Model Enardo ES-850) or the Vent  
Hood assembly (Model Enardo ES-950). Then remove  
the seat from the bore. The lower seat (vacuum) is  
retained by a Spirolox® retaining ring. Remove this ring  
with a flat-bladed screwdriver as shown above.  
8. Reinstall valve pallets and weights into their proper  
chambers. Make sure the lower stem on the pallet  
is centered into the valve seat. If the pallet appears  
to be off-center to the valve chamber, or if there is  
difficulty positioning the lid or guide, the pallet may be  
inserted improperly.  
Spirolox® is a mark owned by Smalley Steel Ring Company.  
13  
Enardo ES-850 and Enardo ES-950 Series  
PLACE RETROFIT STICKER nEXT TO VALVE nAMEPLATE.  
Figure 12. Model Enardo 950 PVRV Retrofit Sticker Placement  
Smart Wireless Monitoring Maintenace  
1. Maintain Wireless Models Enardo ES-850 and Enardo ES-950  
PVRVs in the same way as all standard Models  
Enardo ES-850 and Enardo ES-950 PVRVs. Clean the  
pallet and seat sealing surfaces, remove any buildup  
of residues on the weights and ensure any screens are  
not blocked.  
Remove ring using a flat-bladed screwdriver  
12. For seat replacement, the seats are installed in the  
reverse order of the removal. Make sure the bores are  
clean and that the O-ring seals are not damaged. Use a  
light lubricant when replacing the O-ring and seat.  
2. Take certain precautions when cleaning the transmitter.  
The surface resistivity of the antenna assembly when  
the optional transmitter is installed is greater than 1 GΩ.  
To avoid electrostatic charge build-up, it must not be  
rubbed or cleaned with solvents or dry cloth.  
Retrofit Kits  
The stainless steel seats, pallet assemblies and gaskets  
used in the Enardo ES Series valves are completely  
backwards compatible with Models Enardo 850/Enardo 950  
valves already installed; even those with PPS pallets and  
seats. Existing valves can be upgraded via readily available  
retrofit kits. Each kit contains one (1) Enardo ES Series  
valve seat, one (1) seat O-ring, one (1) lid O-ring, one (1)  
body gasket and one (1) pallet seal. For 8, 10 and 12 in.  
valves that require FEP pallet seals, the retrofit kit contains  
a complete pallet assembly. For valves that have both  
pressure and vacuum relief capabilities, two (2) retrofit kits  
are required to upgrade the entire valve. Note that the kits  
are not specific to the venting function and can be used on  
either the pressure or vacuum side of the valve.  
The overall ATEX rating for all Wireless  
Models Enardo 850 and 950 Valves are listed below:  
Zone 0:  
Zone 1:  
II 1 G Ex h ia IIC T5 G  
II 2 G Ex h ia IIC T5 Gb  
Adjustments  
The Fisher™ pressure/vacuum relief valves have wide range  
of pressure and vacuum settings in units of ounces per  
square inch (oz./sq. in.) or inches of water column (in. w.c.)  
as indicated in the specification section of this instruction  
manual. Standard Fisher valve pallets assemblies are  
marked with a minimum equivalent pressure value in the  
specified units. Installed alone has minimum settings of  
1/2 oz./sq. in. or 1 in. w.c. The pallets are calibrated by the  
seal support located on the bottom side of the pallet. The  
pallet’s setting of 1/2 oz./sq. in. or 1 in. w.c. is etched into  
the support. When a valve requires a setting higher than  
the 1/2 oz./sq. in. or 1 in. w.c. standard pallet setting, use  
weights to increase the pallet’s setting up to the required  
setting. The same seal support used with FEP seals on  
8 in. / 200 mm and larger valves. In this case, the base  
calibration of the pallet assembly can be determined  
by examining the upper and lower guide stems. Pallet  
assemblies calibrated to 1.0 in. w.c. or 25 mm w.c. will have  
stems fabricated using solid bar stock. Pallet assemblies  
calibrated to 0.5 oz./sq. in. or 2.2 mbar will have stems that  
have been fabricated using tubing with plugged ends.  
Follow the instructions outlined in the Maintenance section of  
this manual to replace the existing seats, gaskets and when  
required, pallet assemblies. Once the upgrade is complete,  
place the green retrofit sticker that is included with each kit  
next to the nameplate of the valve as shown in Figure 12.  
The sticker provides confirmation that the valve has been  
upgraded to the Enardo ES Series configuration.  
14  
Enardo ES-850 and Enardo ES-950 Series  
Figure 13. Weights on Pallet  
Table 6. Valve Maintenance  
PART  
REPLACEMEnT  
Simple replacement. Provided with gasket repair kit  
along with other gaskets. The pallet seals are fragile and should  
be handled carefully to avoid damage. They must never be folded  
or creased. Never use abrasive cleaners on a pallet seal.  
Pallet Seals  
Drop-in replacement. Requires removal of lid.  
Replace pallet seal as needed. For best results replace entire pallet assembly.  
Again, care must be taken not to damage the seals.  
Pallet Assemblies  
Body Gaskets  
Requires disassembly. Provided with gasket repair kit  
Requires O-ring gasket to be replaced as well.  
Use care when removing and installing seats to prevent damage  
(scratches, nicks, etc.) to the sealing surface.  
Seats  
Use a light lubricant when replacing the O-ring and installing the seat.  
Additional calibration weights are marked with their  
equivalent pressure value and should be added as  
necessary to achieve the specified setting.  
your order, then they are not needed. For 8 in. / 200 mm  
and larger valves that use FEP seals, a PTFE spacer is  
included and must be installed on top of the pallet before any  
calibration weights are added. The spacer is not used if no  
additional calibration weights are needed.  
Fisher™ weights also come in units of ounces per square  
inch (oz./sq. in.) or inches of water column (in. w.c.). The  
individual setting of each weight is either etched or imprinted  
into the weight. Emerson offers several different sizes of  
pressure/vacuum relief valves. To ensure that the right  
weight is placed on the right pallet, take note that the weights  
and pallets that go together will have the same outside  
diameter. Standard Fisher weights allow the user to stack in  
increments of 1/2 oz./sq. in. or 1/2 in. w.c.  
If the pressure and vacuum weights are mixed together, sort  
and reorganize the weights.  
When installing weights for the Fisher pressure/vacuum  
relief valve, check the required settings on the tag attached  
to the valve. Add weights to the pallet to achieve the required  
setting. If the relief valve’s setting is 6 oz./sq. in., add weights  
with the total setting of 5-1/2 oz./sq. in. to the valve since  
the pallet’s setting alone is 1/2 oz./sq. in. Hence, the valve  
pressure setting is the sum of the settings of the pallet and  
the weights. The relief pressure or vacuum setting is equal  
to the sum of the pallet assembly and individual calibration  
weight equivalent pressure value.  
Pressure/vacuum relief valve is shipped with prepackaged  
weight kits to set the valve pressure properly. The package  
labelled “pressure” is for the pallet in the pressure chamber,  
while the package labelled “vacuum” is for the pallet in the  
vacuum chamber. All weights in these packages should be  
installed. If one or neither of these packages is included with  
15  
Enardo ES-850 and Enardo ES-950 Series  
Valve Repair  
Most repairs will consist of replacing pallet seals, lid gaskets  
WARnInG  
and in some cases, the body gaskets. The seats are also  
replaceable if the need arises. These repairs are relatively  
simple and can normally be handled by plant maintenance  
personnel using common hand tools.  
Make sure line is free of hazardous vapors  
before installing or servicing the valve.  
Observe all applicable safety requirements.  
Only qualified and trained personnel  
shall perform maintenance functions in  
hazardous locations.  
Most valve maintenance can be performed by the customer  
or by a valve repair facility. See Table 6 for the proper  
maintenance of the relief valve parts.  
In most cases, it is not necessary to return the valves to  
the factory. If the valve needs to be tested and certified at  
a specified pressure and/or vacuum, return it to the factory  
or send it to a qualified valve repair facility that is capable  
of performing the necessary tests in accordance with  
API Bulletin 2521 recommendations.  
All replacement parts must be provided  
by Emerson.  
Remove the valve from the tank before attempting any  
repairs beyond pallet assembly and weight maintenance as  
described on Maintenance section.  
Contact your local Sales Office with any questions or  
additional assistance needed for repairing your valve.  
D104632X012 © 2021 Emerson Process Management Regulator  
Technologies, Inc. All rights reserved. 12/21.  
The Emerson logo is a trademark and service mark of Emerson Electric Co.  
All other marks are the property of their prospective owners.  
Fisher™ is a mark owned by Fisher Controls International LLC, a business  
of Emerson Automation Solutions.  
Emerson Automation Solutions  
Americas  
Asia Pacific  
McKinney, Texas 75070 USA  
T +1 800 558 5853  
+1 972 548 3574  
Singapore 128461, Singapore  
T +65 6777 8211  
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.  
Tulsa, OK 74146 USA  
T +1 918 662 6161  
Europe  
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T +39 051 419 0611  
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Dubai, United Arab Emirates  
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Emerson Process Management Regulator Technologies, Inc, does  
not assume responsibility for the selection, use or maintenance of any  
product. Responsibility for proper selection, use and maintenance of any  
Emerson Process Management Regulator Technologies, Inc. product  
remains solely with the purchaser.  

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