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Instruction Manual
D103812X012
January 2022
Enardo 450 and Enardo 550 Series Pressure/
Vacuum Relief Valve (ATEX Approved)
Table of Contents
Introduction .................................................................. 1
Specifications .............................................................. 2
Principle of Operation .................................................. 4
Installation ................................................................... 4
Adjustments ................................................................ 6
Relief Valve Maintenance ............................................ 6
Relief Valve Repair ...................................................... 7
Parts Ordering ............................................................. 8
Parts List...................................................................... 8
▲
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.
Enardo 450 and Enardo 550 Series
Figure 1. Enardo 450 Series Pressure/Vacuum Relief Valve -
Figure 2. 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).
Pipe-Away
Vent-to-Atmosphere
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Related Manuals for Emerson FISHER Enardo 450 Series
Summary of Contents for Emerson FISHER Enardo 450 Series
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Page 1: Table Of Contents
Figure 2. Enardo 550 Series Pressure/Vacuum Relief Valve - Vent-to-Atmosphere federal, state and local codes, rules and regulations and Emerson Process Management Regulator Technologies Tulsa, LLC (Emerson) instructions. Introduction Call a qualified service person to service the unit. -
Page 2: Specifications
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 Vacuum Setting Range (1)(2)(3) - Page 3 Enardo 450 and Enardo 550 Series — — Enardo 550 — Inlet Housing Pallet Pallet Pressure Vacuum Options Connection Material Material Seal Settings Settings Size Material 1 = FEP Teflon z = oz./sq. in. 2 to 12 in. 1 = Aluminum 2 = 316 ®...
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Page 4: Principle Of Operation
Enardo 450 and Enardo 550 Series PRESSURE FLOW VACUUM FLOW Figure 6. Enardo 450 and Enardo 550 Series Pressure/Vacuum Relief Valve Operational Schematics Principle of Operation Installation The Enardo 450 and Enardo 550 Series pressure/ ▲ WARNING vacuum relief valves maintain a tight seal until system pressure or vacuum exceeds the set pressure of the Wear protective gloves and clothing valve. - Page 5 Enardo 450 and Enardo 550 Series Table 1. Enardo 450 and Enardo 550 Series Maximum Pressure/Vacuum Setting PRESSURE SETTING VACUUM SETTING MODEL In. w.c. oz./sq. in. In. w.c. oz./sq. in. Enardo 450-02 21.0 12.0 16.0 Enardo 450-03 21.0 12.0 18.0 10.0 Enardo 450-04 21.0...
- Page 6 Enardo 450 and Enardo 550 Series Table 2. Torque Specifications - Raised Face Flange, Steel only BOLT DIAMETER TORQUE NUMBER OF BOLTS NOMINAL PIPE DIAMETER ft-lbs N•m 0.63 16.0 47.5 0.63 16.0 81.3 0.63 16.0 58.3 0.75 19.1 0.75 19.1 0.88 22.4 0.88...
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Page 7: Adjustments
Valves should be removed from the individual setting of each weight is either etched or location having a potentially explosive imprinted into the weight. Emerson offers several atmosphere and taken to a safe location different sizes of pressure/vacuum relief valve. To for repair and maintenance. -
Page 8: Relief Valve Repair
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. -
Page 9: Parts Ordering
Enardo 450 and Enardo 550 Series 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. - Page 10 Enardo 450 and Enardo 550 Series Enardo 550 Series Description Stud, Vent Assembly Hood, Vent Screen, Pressure Guide Assembly, Pallet Pallet, Pressure (1)(2) Seat, Pressure Stem, Pallet, Pressure (1)(2) Body, Lower Stem, Pallet, Vacuum (1)(2) Pallet, Vacuum (1)(2) Seat, Vacuum Seal, Pallet (1)(2)(3) Support, Seal...
- Page 11 Enardo 450 and Enardo 550 Series Table 6. Enardo 450 and Enardo 550 Series Pressure Relief Valve Seats Part Number PART NUMBER SERIES DESCRIPTION Aluminum Carbon Steel Stainless Steel 2 in. 8853743 8853722 8853701 3 in. 8853744 8853723 8853702 4 in. 8853745 8853724 8853703...
- Page 12 Technologies, Inc. All rights reserved. 01/22. Emerson Automation Solutions 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...