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Instruction Manual
D103815X012
May 2020
850 and 950 Series Pressure/Vacuum Relief
Valve (ATEX Approved)
P1854
MODEL 850
P1854
Figure 1. 850 and 950 Series Pressure/Vacuum Relief Valve
Table of Contents
Introduction .................................................................. 3
Specifications .............................................................. 2
Product Identification and Marking .............................. 4
Principle of Operation .................................................. 5
Installation ................................................................... 8
Maintenance .............................................................. 11
Adjustments ............................................................... 14
Valve Repair .............................................................. 15
MODEL 950
850 and 950 Series
MODEL 850
Figure 2. 850 and 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.
Enardo™ 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.
MODEL 950
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Summary of Contents for Emerson Enardo 850 Series
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Page 1: Table Of Contents
Enardo™ pressure/vacuum relief valve Maintenance .............. 11 must be installed, operated and maintained Adjustments ............... 14 in accordance with federal, state and local codes, rules and regulations, Valve Repair .............. 15 and Emerson Process Management Regulator Technologies Tulsa, LLC (Emerson) instructions. - Page 2 850 and 950 Series Specifications The Specifications section on this page provides specifications for the 850 and 950 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 Construction Materials See Figures 3 and 4...
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Page 3: Introduction
850 and 950 Series MODEL 850 MODEL 850/MVC MODEL 851 MODEL 950 MODEL 951 MODEL 952 MODEL 952/MVC MODEL 953 Figure 4. 850 and 950 Series Pressure/Vacuum Relief Valve Available Models Product Description Failure to correct trouble could result in a hazardous condition. -
Page 4: Product Identification And Marking
850 and 950 Series • Model 850: Pressure/Vacuum Relief Valve — as expected or a separate pressure control problem Pipe-Away in the tank system that is causing both PVRV’s to be open. Ideally, the wireless monitoring of both • Model 850/MVC: Marine Vapor Control System primary and backup devices is preferred in order to Pressure/Vacuum Relief Valve. -
Page 5: Principle Of Operation
850 and 950 Series OUTER HOUSING OF STAINLESS STEEL, CARBON STEEL OR COATED ALUMINUM OUTER HOUSING OF UNCOATED ALUMINUM Figure 5. Product Identification and Marking PRESSURE FLOW VACUUM FLOW Figure 6. Pressure and Vacuum Flow • Cert. No. (Certificate Number) – Ex. 10273X This is common to products of this type. - Page 6 850 and 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 850 PIPE-AWAY PRESSURE/VACUUM RELIEF VALVE GUIDE BUSHING UPPER GUIDE...
- Page 7 850 and 950 Series WIRELESS LID TRANSMITTER SENSOR CONDUIT WIRELESS STEM WIRELESS LID SENSOR CONDUIT WIRELESS STEM Figure 8. Model 850 with Smart Wireless Option CONDUIT WIRELESS HOOD SENSOR BRACKET TRANSMITTER SET SCREW SLEEVE WIRELESS STEM WIRELESS LID CONDUIT VENT ROD SENSOR WIRELESS STEM Figure 9.
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Page 8: Installation
850 and 950 Series Installation Note All product configurations use similar 850 and 950 Series packing methods. 2. Remove valve pallets from the unit. Separate the WARNING protective cardboard coverings from the pallet stems and seals. Be careful not to damage the Wear protective gloves and clothing pallet seal surface. - Page 9 850 and 950 Series Smart Wireless Monitoring weights (if required) by engaging the hole in the weight on the appropriate pallet assembly stem. Units with Smart Wireless are shipped as self-contained and already connected. The only connection required is 5.1. The weights are marked with their pressure installation of the transmitter battery which is intrinsically equivalents and are shipped outside of the valve safe and does not require a hot-work permit.
- Page 10 850 and 950 Series Table 1. Torque Specifications - Raised Face Flange, Steel Only NOMINAL PIPE DIAMETER NUMBER OF BOLTS BOLT DIAMETER, IN. TORQUE, FT-LBS 0.50 1-1/4 0.50 1-1/2 0.50 0.63 2-1/2 0.63 0.63 3-1/2 0.63 0.63 0.75 0.75 0.88 0.88 1.00 1.00...
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Page 11: Maintenance
850 and 950 Series 3. For the Model 950 PVRVs containing hoods, the For preventive maintenance of the Enardo pressure/ sensor is located at a proper distance away from vacuum relief valve, refer to the following instructions. the stem by using a sleeve, bracket and set screw. The sensor is held within the sleeve using two jam nuts. - Page 12 850 and 950 Series 5. Inspect the valve seats installed in the unit. The sealing surfaces should be smooth and free of nicks or buildup. 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.
- Page 13 850 and 950 Series 8. Reinstall valve pallets and weights into their proper 10. Replace any lid, hood or guide that was previously chambers. Make sure the lower stem on the removed and fasten securely. When tightening pallet is centered into the valve seat. If the pallet down lids, make sure the O-ring in each lid has full appears to be off-center to the valve chamber, or contact with the sealing surface.
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Page 14: Adjustments
(in. w.c.). The individual setting of each weight is either water column (in. w.c.) as indicated in the specification etched or imprinted into the weight. Emerson offers section of this instruction manual. Standard Enardo several different sizes of pressure/vacuum relief valves. -
Page 15: Valve Repair
Contact your local Sales Office with any questions or vapors before installing or servicing additional assistance needed for repairing your valve. 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. - Page 16 Technologies, Inc. All rights reserved. 05/20. 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. Enardo™ is a mark owned by Regulator Technologies Tulsa, LLC, a...