EMERSON Enardo 450 Pressure Vacuum Relief Valve Instruction Manual

EMERSON Enardo 450 Pressure Vacuum Relief Valve

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. Call a qualified service person to service the unit. Installation, operation and maintenance procedures performed by 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 Enardo 450 and Enardo 550 Series pressure/vacuum relief valve.

Introduction

Scope of the Manual
This manual provides specifications, installation, operation and maintenance instructions and parts ordering information for the Enardo 450 and Enardo 550 Series pressure/vacuum relief valve (PVRV).

Enardo 450 and Enardo 550 Series

Specifications

The Specifications section on this page provides specifications for the Enardo 450 and Enardo 550 Series pressure/vacuum relief valve. Specification is stamped on the nameplate attached to the relief valve. Refer to Product Identification and Marking section for the nameplate details.

• Available Construction
  • See Figures 3 and 4
• Available Sizes
  • 2 to 12 in. / 50 to 300 mm
• Pressure Setting Range(1)(2)(3)
  • Enardo 450 Series: 0.5 to 12.0 oz./sq. in. 1.0 to 21.0 in. w.c. 2.0 to 50.0 mbar
  • Enardo 550 Series: 0.5 to 12.0 oz./sq. in. 1.0 to 21.0 in. w.c. 2.0 to 50.0 mbar
• Vacuum Setting Range(1)(2)(3)
  • Enardo 450 Series: 0.5 to 12.0 oz./sq. in. 1.0 to 21.0 in. w.c. 2.0 to 50.0 mbar
• Vacuum Setting Range(1)(2)(3)
  • Enardo 550 Series: 0.5 to 12.0 oz./sq. in. 1.0 to 21.0 in. w.c. 2.0 to 50.0 mbar
• Maximum Pressure/Vacuum Setting(1)
  • See Table 1
• Housing Material
  • Aluminum, Carbon steel or Stainless steel
• Certification
  • EN IEC 60079-0:2018
  • EN IEC 60079-11:2012
  • EN ISO 80079-36:2016
  • EN ISO 80079-37:2016

1. The pressure limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
2. Pressure or vacuum setting has an increment of 0.5 oz./sq. in., 0.5 in. w.c. or 2.2 mbar.
3. Pressure and vacuum settings vary by size. Refer to Table 1 for details.

Product Description

The Enardo 450 and Enardo 550 Series pressure/vacuum relief valves provide protection against positive or vacuum overpressure and prevent air intake and evaporative losses of product while helping to contain odorous and potentially explosive vapors. The Enardo 450 Series is used for routine service in pipe- away applications while the Enardo 550 Series is used for vent-to-atmosphere application.

Features

• Stainless steel pallet with FEP Teflon® Seal
• Replaceable Seats
• Ameron System 1 Coating
• High Capacity Flow

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 5.

Nameplate
A nameplate is attached to the valve and contains the following information:

• Model Number – Ex. 550-4-521
• Size – Ex. 4 in.
• Serial Number
• Tag Number (Optional)
• Notified Body Number – Ex. 2460
• Cat. No. (Category Number)
  • Category 1 – Stainless steel, Carbon steel or Coated aluminum vents
  • 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

The Enardo 450 and Enardo 550 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. 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.

Installation

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.

WARNING
Ensure line is free of hazardous vapors before installing or servicing the valve.

1. Loosen fasteners on top of the valve and remove the lid, hood or guide.
2. Remove valve pallets from the unit. Carefully separate the protective cardboard coverings from the pallets to avoid damage on the pallet seal surface.
3. Reinsert uncovered valve pallets back into the unit.
   Enardo 450 and Enardo 550 Series Maximum Pressure/Vacuum Setting**** __

MODEL

| PRESSURE SETTING| VACUUM SETTING
---|---|---
In. w.c.| oz./sq. in.| In. w.c.| oz./sq. in.
Enardo 450-02| 21.0| 12.0| 16.0| 9.0
Enardo 450-03| 21.0| 12.0| 18.0| 10.0
Enardo 450-04| 21.0| 12.0| 21.0| 12.0
Enardo 450-06| 21.0| 12.0| 21.0| 12.0
Enardo 450-08| 21.0| 12.0| 21.0| 12.0
Enardo 450-10| 21.0| 12.0| 21.0| 12.0
Enardo 450-12| 21.0| 12.0| 19.0| 11.0
Enardo 550-02| 19.0| 10.5| 16.0| 9.0
Enardo 550-03| 21.0| 12.0| 18.0| 10.0
Enardo 550-04| 17.5| 10.0| 21.0| 12.0
Enardo 550-06| 17.5| 10.0| 21.0| 12.0
Enardo 550-08| 19.0| 10.5| 21.0| 12.0
Enardo 550-10| 16.0| 9.0| 21.0| 12.0
Enardo 550-12| 21.0| 12.0| 19.0| 11.0
4. Remove any protective flange covers. 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.

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.

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, install the weights 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. Refer to Adjustments section for more details on using weights to adjust the pallet setting.

3. Replace the covers and/or hood.
   Note
   Pallet should be centered inside unit. Do not force the lid down over the pallet stem. With correct installation, the lid should slip easily over the stem and the pallet should be free to move upwards, with the pallet stem travelling into the stem guide.

4. Replace wing nuts or nuts and tighten to secure covers/hoods in position.

5. 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 moves vertically. Valves that are tilted during usage may suffer premature damage or wear.

For proper bolt torquing of the valve connecting flange to the piping, please refer to Tables 2 to 4.

Torque Specifications – Raised Face Flange, Steel only

__

NOMINAL PIPE DIAMETER

| __

NUMBER OF BOLTS

| BOLT DIAMETER| TORQUE
---|---|---|---
In.| mm| ft-lbs| N•m
2| 4| 0.63| 16.0| 35| 47.5
3| 4| 0.63| 16.0| 60| 81.3
4| 8| 0.63| 16.0| 43| 58.3
6| 8| 0.75| 19.1| 80| 108
8| 8| 0.75| 19.1| 109| 148
10| 12| 0.88| 22.4| 101| 137
12| 12| 0.88| 22.4| 135| 183
14| 12| 1.00| 25.4| 168| 228
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 Lubricant Table.

For best results, hardened steel washers should be used on all cast flange bolted connections.

Torque Specifications – Flat Face Flange, Steel or Aluminum

__

NOMINAL PIPE DIAMETER

| __

NUMBER OF BOLTS

| BOLT DIAMETER| TORQUE
---|---|---|---
In.| mm| ft-lbs| N•m
2| 4| 0.63| 16.0| 32| 43.4
3| 4| 0.63| 16.0| 47| 64.7
4| 8| 0.63| 16.0| 32| 43.4
6| 8| 0.75| 19.1| 49| 66.4
8| 8| 0.75| 19.1| 68| 92.2
10| 12| 0.88| 22.4| 69| 93.6
12| 12| 0.88| 22.4| 98| 133
14| 12| 1.00| 25.4| 138| 187
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 Lubricant Table.

For best results, hardened steel washers should be used on all cast flange bolted connections.

Torque Reduction Factor 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

Adjustments

The Enardo 450 and Enardo 550 Series pressure/vacuum relief valves have wide range of pressure and vacuum settings in units of oz./sq. in. or in. w.c. Standard Fisher™ valve pallets 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.

Fisher weights also come in oz./sq. in. or 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 valve. To ensure that the right weight is placed on the right pallet, take note that the weights and pallets that go together 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. If the pressure and vacuum weights are mixed together, sort and reorganize the weights. When installing weights in the relief valve, check the required setting on the tag attached to the relief 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.

Relief Valve Maintenance

WARNING
Make sure line is free of hazardous vapors before installing or servicing the valve. Use of non-sparking tools is necessary if flammable vapors are present. Observe all applicable safety requirements. Only qualified and trained personnel shall maintain the valve 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.

Limited maintenance of the relief valve installed on the tank is possible, provided that all necessary safety precautions have been taken. To have the optimum sealing performance of the Enardo 450 and Enardo 550 Series, maintain the valve and use clean and undamaged pallet seals and seats. To access the pallets:

1. Loosen the fasteners on top of the valve and remove the lid, hood or guide.
2. Remove any valve pallets and weights from the unit. Take note of the proper chamber of the pallets and weights.
3. Inspect the pallets for any damage and/or buildup. Damaged pallets could not seal and move inside the valve properly. If necessary, gently clean the pallet and seal with a suitable solvent and nonabrasive cloth. Never fold or crease the seal. If the seal is damaged, replace it.
4. Remove any buildup on the weights.
5. Inspect the valve seats. The sealing surfaces should be smooth and free of nicks or buildup. If necessary, gently clean the seats with a suitable solvent and nonabrasive cloth.
6. If lid is available on the valve, clean any buildup in or around the guide hole located in the center of the part.
7. Remove any blockage in the pressure or vacuum screens that may impede proper flow of fluid.
   Enardo 450 and Enardo 550 Series Parts Repair** PART| REPLACEMENT**
   ---|---
   Pallet Seals| Simple replacement. Provided with gasket repair kit along with other gaskets. The pallet seals are fragile, handle the seals

carefully to avoid damage. Never fold or crease the pallet seal. Never use abrasive cleaners on a pallet seal.

Pallet Assemblies| Drop-in replacement. Requires removal of lid and replacement of gasket. Be careful not to damage the seals.
Body Gaskets| Requires disassembly. Provided with gasket repair kit .
Seats| Requires gasket to be replaced as we ll.
Weights| Requires removal of lid and replacement of gasket on Enardo 450 Series valves. Ensure that the proper weights are installed in the right location.
8. Reinstall valve pallets and weights into their proper chambers. 9. Reinstall weights onto their appropriate valve pallets. 10. Replace any lid, hood or guide that was removed and fasten securely. When tightening down lids, make sure the lid gasket has full contact with the sealing surface.

Note
Pallet should be centered inside the unit. Do not force the lid down over the pallet stem. With correct installation, the lid should slip easily over the stem.

Relief 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 relief valve from the tank before attempting any repairs beyond pallet assembly and weight maintenance as described on the Relief Valve Maintenance section. Most repairs consist of replacing pallet seals, lid gaskets and in some cases, the body gaskets. The seats are also replaceable if necessary. 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 5 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 the relief valve.

Parts Ordering

When corresponding with your local Sales Office about this equipment, always reference the equipment serial number stamped on the nameplate. When ordering replacement parts, specify the complete 7-character part number of each required part as found in the following parts list.

Parts List

Enardo 450 Series

Key Description

1. Lid, Pressure
2. Body, Upper
3. Lid, Vacuum
4. Body, Lower
5. Seat, Pressure(1)
6. Seat, Vacuum(1)
7. Pallet, Pressure(1)(2)
8. Stem, Pallet(1)(2)
9. Seal, Pallet(1)(2)(3)
10. Support, Seal(1)(2)
11. Gasket, Lid (2 required)(1)(3)
12. Pallet, Vacuum(1)(2)
13. Gasket, Pressure Seat (2 required)(1)(3)
14. Gasket, Vacuum Seat(1)(3)
15. Screen, Vacuum
16. Cap Screw, Lid
17. Washer, Flat
18. Cap Screw
19. Nut, Hex(2)
20. Washer, Flat(2)
21. Cap Screw
22. Washer, Flat
23. Plate, Identification

Enardo 550 Series

Key Description

1. Stud, Vent Assembly
2. Hood, Vent
3. Screen, Pressure
4. Guide Assembly, Pallet
5. Pallet, Pressure(1)(2)
6. Seat, Pressure(1)
7. Stem, Pallet, Pressure(1)(2)
8. Body, Lower
9. Stem, Pallet, Vacuum(1)(2)
10. Pallet, Vacuum(1)(2)
11. Seat, Vacuum(1)
12. Seal, Pallet(1)(2)(3)
13. Support, Seal(1)(2)
14. Screen, Vacuum
15. Lid, Vacuum
16. Gasket, Vacuum, Lid(1)(3)
17. Washer, Flat
18. Cap Screw, Lid
19. Washer, Flat(2)
20. Nut, Hex(2)
21. Gasket, Vacuum Seat(1)(3)
22. Nut, Wing
23. Nut, Hex
24. Cap Screw
25. Washer, Flat
26. Plate, Identification

Enardo 450 and Enardo 550 Series Pressure Relief Valve Seats Part Number

__

SERIES

| __

DESCRIPTION

| PART NUMBER
---|---|---
Aluminum| Carbon Steel| Stainless Steel
__

__

__

__

Enardo 450

| 2 in.| 8853743| 8853722| 8853701
3 in.| 8853744| 8853723| 8853702
4 in.| 8853745| 8853724| 8853703
6 in.| 8853746| 8853725| 8853704
8 in.| 8853747| 8853726| 8853705
10 in.| 8853748| 8853727| 8853706
12 in.| 8853749| 8853728| 8853707
__

__

__

__

Enardo 550

| 2 in.| 8853750| 8853729| 8853708
3 in.| 8853751| 8853730| 8853709
4 in.| 8853752| 8853731| 8853710
6 in.| 8853753| 8853732| 8853711
8 in.| 8853754| 8853733| 8853712
10 in.| 8853755| 8853734| 8853713
12 in.| 8853756| 8853735| 8853714

Enardo 450 and Enardo 550 Series Vacuum Relief Valve Seats Part Number

__

SERIES

| __

DESCRIPTION

| PART NUMBER
---|---|---
Aluminum| Carbon Steel| Stainless Steel
__

__

__

__

Enardo 450 and Enardo 550

| 2 in.| 8853757| 8853736| 8853715
3 in.| 8853758| 8853737| 8853716
4 in.| 8853759| 8853738| 8853717
6 in.| 8853760| 8853739| 8853718
8 in.| 8853761| 8853740| 8853719
10 in.| 8853762| 8853741| 8853720
12 in.| 8853763| 8853742| 8853721

Enardo 450 and Enardo 550 Series Pallet Assembly(1) Part Number

__

MODEL

| VALVE SIZE| PART NUMBER
---|---|---
In.| mm| Pressure (Pallet Location)| Vacuum (Pallet Location)
__

__

__

__

__

Enardo 450

| 2 x 3| 51 x 76| 8850401| 8850401
3 x 4| 76 x 102| 8850402| 8850402
4 x 6| 102 x 152| 8850404| 8850403
6 x 8| 152 x 203| 8850406| 8850405
8 x 10| 203 x 254| 8850408| 8850407
10 x 12| 254 x 305| 8850410| 8850409
12 x 14| 305 x 356| 8850412| 8850411
__

__

__

__

Enardo 550

| 2| 51| 8850401| 8850401
3| 76| 8850402| 8850402
4| 102| 8850403| 8850403
6| 152| 8850405| 8850405
8| 203| 8850407| 8850407
10| 254| 8850409| 8850409
12| 305| 8850411| 8850411
1. Pallet assemblies with 316 Stainless steel with FEP (Teflon®) seals.

Enardo 450 and Enardo 550 Series Gasket Sets(1) Part Number

__

MODEL

| VALVE SIZE| __

MATERIAL

| __

PART NUMBER

---|---|---|---
In.| mm
__

__

__

__

__

__

__

__

Enardo 450

| __

2 x 3

| __

51 x 76

| Compressed Fiber| 6105022
Teflon®| 6105024
3 x 4| 76 x 102| Compressed Fiber| 6105025
Teflon®| 6105027
4 x 6| 102 x 152| Compressed Fiber| 6105028
Teflon®| 6105030
6 x 8| 152 x 203| Compressed Fiber| 6105031
Teflon®| 6105033
8 x 10| 203 x 254| Compressed Fiber| 6105034
Teflon®| 6105036
10 x 12| 254 x 305| Compressed Fiber| 6105037
Teflon®| 6105039
12 x 14| 305 x 356| Compressed Fiber| 6105040
Teflon®| 6105042
__

__

__

__

__

__

__

__

Enardo 550

| 2| 51| Compressed Fiber| 6105001
Teflon®| 6105003
3| 76| Compressed Fiber| 6105004
Teflon®| 6105006
4| 102| Compressed Fiber| 6105007
Teflon®| 6105009
6| 152| Compressed Fiber| 6105010
Teflon®| 6105012
__

8

| __

203

| Compressed Fiber| 6105013
Teflon®| 6105015
10| 254| Compressed Fiber| 6105016
Teflon®| 6105018
__

12

| __

305

| Compressed Fiber| 6105019
Teflon®| 6105021
1. Gasket sets include body and lid gaskets and pallet seal.

Emerson Automation Solutions

Americas

• McKinney, Texas 75070 USA
• T +1 800 558 5853/ +1 972 548 3574
• Tulsa, OK 74146 USA
• T +1 918 662 6161

Europe

• Bologna 40013, Italy
• T +39 051 419 0611

Asia Pacific

• Singapore 128461, Singapore
• T +65 6777 8211

Middle East and Africa

• Dubai, United Arab Emirates
• T +971 4 811 8100

D103812X012 © 2015, 2022 Emerson Process Management Regulator Technologies, Inc. All rights reserved. 01/22. 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. The contents of this publication are presented for information purposes only, and while effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regardingthe products or services described herein or their use or applicability. All sales are governed by our terms and conditions, which are available on request. We reserve the right to modify or improve the designs or specifications of our products at any time without notice.

Emerson Process Management Regulator Technologies Tulsa, LLC 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 Tulsa, LLC product remains solely with the purchaser.

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