EMERSON ES-950 Series Pressure-Vacuum Relief Valve Instruction Manual
- June 5, 2024
- Emerson
Table of Contents
Instruction Manual
D104632X012 December 2021
Enardo ES-850 and Enardo ES-950 Series
Enhanced Sealing Enardo ES-850 and
Enardo ES-950 Series Pressure/Vacuum
Relief Valve (ATEX Approved)
Figure 1. Enardo ES-850 and Enardo ES-950 Series Pressure/Vacuum Relief
Valve
Figure 2. Enardo ES-850 and Enardo ES-950 Series with Smart Wireless
option
WARNING
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
Specifications
The Specifications section on this page provides specifications for the Enardo ES-850 and Enardo ES-950 Series pressure/ vacuum relief valve. The specification is stamped on the nameplate attached to the relief valve. Refer to the Product Identification and Marking section for the nameplate details.
Available Constructions
See Figures 3 and 4
Inlet Connection Sizes
2 through 12 in. / 50 through 300 mm
Pressure Ranges (1)(2)
For sizes up to 6 in. / 150 mm
0.5 to 32 oz./sq. in.
1.0 to 55 in. w.c.
2.15 to 138 mbar
22 to 1406 mm w.c.
For sizes 8 in. / 200 mm and larger(3)
0.5 to 24 oz./sq. in.
1.0 to 41.5 in. w.c.
2.15 to 103 mbar
22 to 1055 mm w.c.
Vacuum Pressure Ranges(1)(2)
For sizes up to 6 in. / 150 mm
0.4 to 32 oz./sq. in.
1.0 to 55 in. w.c.
1.72 to 138 mbar
17.6 to 1406 mm w.c.| Vacuum Pressure Ranges (1)(2) (continued)
For sizes 8 in. / 200 mm and larger(3)
0.4 to 24 oz./sq. in.
1.0 to 41.5 in. w.c.
1.72 to 103 mbar
17.6 to 1055 mm w.c.
Construction Materials
Housing: Aluminum, Stainless steel or Carbon steel
Seat / Pallet: 316 Stainless steel
Pallet Seal: Nitrile (NBR), Fluorinated Ethylene
Propylene (FEP), Fluorocarbon (FKM) or
Fluorosilicone (FVMQ)
Hardware: Zinc-plated Carbon steel or Stainless steel
Weights: Zinc-plated Carbon steel, Stainless steel
or Lead
Gaskets: Nitrile (NBR), FEP, Fluorocarbon (FKM) or
Fluorosilicone (FVMQ)
Certifications
EN IEC 60079-0:2018
EN IEC 60079-11:2012
EN ISO 80079-36:2016
EN ISO 80079-37:2016
---|---
- The pressure limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
- The pressure or vacuum setting has an increment of 0.5 oz./sq. in., 0.5 in. w.c. or 2.2 bar.
- 8, 10, and 12 in. / 200, 250, and 300 mm sizes limited to a maximum pressure relief setting of 16 oz./sq.in. / 69 mbar when a vacuum relief setting of 0.4 oz./sq. in. / 1.72 bar is used.
Failure to correct trouble could result in a hazardous condition. Call a qualified service person to service the unit. Installation, operation and maintenance procedures performed by an unqualified person may result in improper adjustment and unsafe operation. Either condition may result in equipment damage or personal injury. Only a qualified person shall install or service the pressure/ vacuum relief valve.
Introduction
Scope of the Manual
This Instruction Manual provides instructions for installation, maintenance,
and parts ordering information for the Enardo ES-850 and Enardo ES-950 Series
Pressure/ Vacuum Relief Valve (PVRV).
Product Description
Enardo ES-850 and Enardo ES-950 Series
The Enardo ES-850 and Enardo ES-950 Series Pressure/ Vacuum Relief Valves
provide protection against positive or vacuum overpressure and prevent air
intake and evaporative losses of the product while helping to contain odorous
and potentially explosive vapors.
The Enardo ES-850 Series provides pressure and vacuum relief in applications
that require hazardous vapors to be piped away rather than released into the
atmosphere.
The Enardo ES-950 Series valve provides pressure and vacuum relief for normal
venting requirements while maintaining a safe internal working pressure to
prevent the routine expulsion of waste gas to the atmosphere.
- Model Enardo ES-850: Pressure/Vacuum Relief Valve — Pipe-Away
- Model Enardo ES-851: Top Mount Pressure or Side
- Mount Vacuum Relief Valve — Pipe-Away
- Model Enardo ES-950: Pressure/Vacuum Relief Valve — Vent-to-Atmosphere
- Model Enardo ES-951: Pressure Relief Valve — Vent-to-Atmosphere
- Model Enardo ES-952: Top Mount Vacuum Relief Valve — End-of-Line
- Model Enardo ES-953: Side Mount Vacuum Relief Valve
MODEL EnARDO ES-850 PRESSURE/VACUUM RELIEF VALVE MODEL UMBER
MODEL EnARDO ES-950 PRESSURE/VACUUM RELIEF VALVE MODEL NUMBER
Figure 3. Pressure/Vacuum Relief Valve Model Number
Figure 4. Enardo ES-850 and Enardo ES-950 Series Pressure/Vacuum Relief Valve Available Models
Table 1. Model Enardo ES-850 Weights(1)
INLET CONNECTION| OUTLET CONNECTION| WEIGHT (ALUMINUM)|
WEIGHT (STAINLESS STEEL OR CARBON STEEL)| WEIGHT OF CALIBRATION
WEIGHTS REQUIRED TO ACHIEVE DESIRED RELIEF SETTING (2)(3)
---|---|---|---|---
Weight per oz/sq. in.| Weight per in. w. c.
In.| mm| In.| mm| Lb| kg| Lb| kg|
Lb| kg| Lb| kg
2| 50| 3| 80| 29| 13| 80| 36| 0.9| 0.3| 0.5| 0.2
3| 80| 3| 80| 31| 14| 85| 39| 0.9| 0.3| 0.5| 0.2
3| 80| 4| 100| 33| 15| 90| 41| 0.9| 0.3| 0.5| 0.2
4| 100| 6| 150| 57| 26| 144| 65| 2.3| 1.0| 1.3| 0.6
6| 150| 6| 150| 62| 28| 155| 70| 2.3| 1.0| 1.3| 0.6
6| 150| 8| 200| 70| 32| 178| 81| 2.3| 1.0| 1.3| 0.6
8| 200| 10| 250| 161| 73| 485| 220| 7.8| 3.5| 4.5| 2.0
10| 250| 10| 250| 166| 75| 503| 228| 7.8| 3.5| 4.5| 2.0
10| 250| 12| 300| 172| 78| 525| 238| 7.8| 3.5| 4.5| 2.0
12| 300| 12| 300| 175| 79| 532| 241| 7.8| 3.5| 4.5| 2.0
12| 300| 14| 350| 208| 94| 622| 282| 7.8| 3.5| 4.5| 2.0
1. Unit weights indicate the Net Weight of the valve in pounds and kilograms
at a standard set pressure (0.5 oz/sq. in. pressure – 0.5 oz/sq. in. vacuum).
It does not include a shipping crate or box.
2. Multiply the relief set 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 the determination of valve relief settings.
Table 2. Model Enardo ES-950 Weights(1)
INLET CONNECTION| WEIGHT (ALUMINUM)| WEIGHT (STAINLESS STEEL OR CARBON STEEL)|
WEIGHT OF CALIBRATION WEIGHTS REQUIRED TO ACHIEVE DESIRED RELIEF SETTING(20)
---|---|---|---
Weight per oz/sq. in.| Weight per in. w. c.
In.| mm| Lb| kg| Lb| kg| Lb| kg| Lb| kg
2| 50| 21| 10| 54| 24| 0.9| 0.3| 0.5| 0.2
3| 80| 23| 10| 58| 26| 0.9| 0.3| 0.5| 0.2
4| 100| 41| 19| 110| 50| 2.| 1.0| 1.| 0.6
6| 150| 45| 20| 123| 56| 2.| 1.0| 1.| 0.6
8| 200| 123| 56| 362| 164| 8.| 4.| 5.| 2.0
10| 250| 129| 59| 383| 174| 8.| 4.| 5.| 2.0
12| 300| 144| 65| 405| 184| 8.| 4.| 5.| 2.0
1. Unit weights indicate the Net Weight of the valve in pounds and kilograms
at a standard set pressure (0.5 oz/sq. in. pressure – 0.5 oz/sq. in. vacuum).
It does not include a shipping crate or box.
2. Multiply the relief set 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 the determination of valve relief setting.
Smart Wireless Monitoring Option
**WARNING**
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.
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.
The following are a few specific examples of how this added visibility can
help prevent problems: Example #1 – Redundant PVRVs Redundant PVRVs are
commonly used for added safety. If the primary PVRV fails to close or is
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 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.
Figure 5. Pressure and Vacuum Flow
Example #2 – Tank Blanketing
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.
Example #3 – Emergency Vent
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.
Product Identification and Marking
CAUTION
As part of the legacy Model Enardo 850/ Enardo 950 ATEX certification, an 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.
| II 1 G Ex h IIC T6 Ga| OUTER HOUSInG OF STAInLESS STEEL, CARBOn STEEL OR
COATED ALUMInUM
---|---|---
| II 2 G Ex h IIC T6 Gb| OUTER HOUSInG OF UnCOATED ALUMInUM
Hazardous Locations
Fisher™ pressure/vacuum relief valves are available with outer housings of
carbon steel, stainless steel or aluminum, as indicated in Figure 6.
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)
-
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
– Flow Rate SCFH (Air) – Ex. 00000
Principle of Operation
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.
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.
MODEL EnARDO ES-850 PIPE-AWAY PRESSURE/VACUUM RELIEF VALVE
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
Figure 8. Model Enardo ES-850 with Smart Wireless Option
Figure 9. Model Enardo ES-950 with Smart Wireless Option
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. 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.
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.
-
Loosen fasteners on top of the valve and remove the lid, hood or guide. REMOVE CARDBOARD FROM PALLET STEMS REMOVE CARDBOARD FROM PALLET STEMS note
All product configurations use similar packing methods. -
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.
-
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.
-
Remove any protective flange covers.
note
For more details on using weights to adjust the pallet setting, read the
Adjustments section.
CAUTION
Use care when installing weights and securing lids to avoid getting
pinched.
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 arebeing
installed to provide the specified pressure and/or vacuum setting. Refer to
the nameplate data to verify the specified factory settings.
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. 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.
CAUTION
Use care when installing weights and securing lids to avoid getting
pinched.
6. Install the covers and/or hood.
7. Re-use existing wing nuts or nuts and tighten to secure 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.
For proper bolt torquing of the valve connecting flange to thepiping, please
refer to Tables 3 to 5.
Smart Wireless Monitoring
WANRNING
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.
- 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
- 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.
Table 3. Torque Specifications – Raised Face Flange, Steel Only
NOMINAL PIPE DIAMETER| NUMBER OF BOLTS| BOLT DIAMETER, IN.|
TORQUE, FT-LBS
---|---|---|---
2| 4| 0.63| 35
3| 4| 0.63| 60
4| 8| 0.63| 43
6| 8| 0.75| 80
8| 8| 0.75| 109
10| 12| 0.88| 101
12| 12| 0.88| 135
14| 12| 1.00| 168
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| 4| 0.63| 32
3| 4| 0.63| 47
4| 8| 0.63| 32
6| 8| 0.75| 49
8| 8| 0.75| 68
10| 12| 0.88| 69
12| 12| 0.88| 98
14| 12| 1.00| 138
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| COEFFICIENT OF FRICTION| MULTIPLY TORQUE VALUE IN
TABLE BY
---|---|---
Machine Oil| f = 0.15| 0.75
API SA2 Grease| f = 0.12| 0.60
Nickel-based Lubricant| f = 0.11| 0.55
Copper-based Lubricant| f = 0.10| 0.50
Heavy-Duty Lubricating Paste| f = 0.06| 0.30
3. For the Model Enardo ES-950 PVRVs containing hoods, 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.
Maintenance
Enardo ES-850 and Enardo ES-950 Series
WARNING
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. Ensure that all proper safety procedures and safeguards are followed when working on units, especially if they are in the elevated position. 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. Valves should be removed from the location having a potentially explosive atmosphere and taken to a safe location for repair and maintenance.
CAUTION
When removing and installing seats, ensure to handle it with care to
prevent damage (scratches, nicks, etc.) to the sealing surface.
For preventive maintenance of the Fisher™ pressure/ vacuum relief valve, refer
to the following instructions.
- Loosen the fasteners on top of the valve and remove the lid, hood or guide.
- 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.
- Inspect the pallets for any damage or buildup that 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.
- Clear away any buildup on the weights or on the housing.
- 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.
- 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.
- If the valve is fitted with a screen of some type, clear away any blockage that may impede proper flow.
- 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.
- Reinstall weights onto their appropriate valve pallets.
- 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.
- 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.
- 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.
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.
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.
Figure 12. Model Enardo 950 PVRV Retrofit Sticker Placement
Smart Wireless Monitoring Maintenace
- 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.
- 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.
The overall ATEX rating for all Wireless Models Enardo 850 and 950 Valves are listed below:
Zone 0: 1 G Ex h ia IIC T5 G
Zone 1: 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.
Figure 13. Weights on Pallet
Table 6. Valve Maintenance
| PART | REPLACEMENT |
|---|---|
| Pallet Seals | 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 Assemblies| 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.
Body Gaskets| Requires disassembly. Provided with gasket repair kit
Seats| Requires 0-ring gasket to be replaced as well.
Use care when removing and installing seats to prevent damage
(scratches, nicks, etc.) to the sealing surface.
Use a light lubricant when replacing the 0-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.
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.
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 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.
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.
Valve Repair
WARNING
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.
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.
Most repairs will consist of replacing pallet seals, lid gaskets 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.
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.
Contact your local Sales Office with any questions or additional assistance
needed for repairing your valve.
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business of Emerson Automation Solutions.
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not to be construed as warranties or guarantees, express or implied, regarding
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