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MERCER 9100 Series Manual

Direct spring operated pressure relief valve
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ENG-502000
9100 SERIES
DIRECT SPRING OPERATED PRESSURE
RELIEF VALVE
INSTALLATION, OPERATION, &
MAINTENANCE MANUAL
Before installation of a Mercer Valve Co., Inc. Pressure Relief Valve, all sections of this document and all
regulatory authority codes must be read and understood. Failure to do so voids all warranties.

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Summary of Contents for MERCER 9100 Series

  • Page 1 RELIEF VALVE INSTALLATION, OPERATION, & MAINTENANCE MANUAL Before installation of a Mercer Valve Co., Inc. Pressure Relief Valve, all sections of this document and all regulatory authority codes must be read and understood. Failure to do so voids all warranties.

  • Page 2: Table Of Contents

    DATE 23-July-2020 3152 Table of Contents Scope ..............................4 Definitions ............................5 Handling and Shipping ........................7 Unpacking and Storing........................8 Installation ............................9 Operation ............................13 Maintenance ............................ 14 Inspections ............................16 Visual Inspection ..........................16 Set Pressure Inspection ........................18 Leak Inspection ..........................
  • Page 3 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Repair Kit Product Numbering ....................... 65 Exploded Views ..........................66 Cutaway View ..........................70 Trouble Shooting Guide ........................74 MERCER VALVE CO., INC. RESERVES THE RIGHT TO CHANGE PRODUCT DESIGNS AND SPECIFICATIONS WITHOUT NOTICE.

  • Page 4: Scope

    INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Scope This document is used for the installation, operation, and maintenance of a Mercer Valve Co., Inc. 9100 Series pressure relief valve. This document should be read and understood before the valve is installed, put into service, or maintained. Failure to do so can result in improper operation that could result in damage to equipment or affect the safety of individuals around the equipment.

  • Page 5: Definitions

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Definitions Accumulation is the amount of pressure increase above the MAWP of the system that is allowed. Accumulation is set from the applicable codes.
  • Page 6 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Over Pressure is the amount of pressure increase above the set pressure allowed for the pressure relief valve to achieve full lift and full flow. Set pressure plus over pressure should never exceed MAWP plus accumulation, but they will often be equal.

  • Page 7: Handling And Shipping

    INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Handling and Shipping Mercer Valve Co., Inc. produces a very durable pressure relief valve. Even though these valves are able to take some abuse, it is recommended that they are handled and shipped with care. This will help prevent damage prior to their installation.

  • Page 8: Unpacking And Storing

    The protectors should also seal the openings so that foreign materials cannot ingress. PRVs are usually stored vertically to keep parts aligned, however, this isn’t required for Mercer’s PRVs. Although vertical storage can help with initial startup in certain circumstances, these valves may be stored horizontally.

  • Page 9: Installation

    Before installation, the valve should be visually inspected for any damage that occurred during shipping and storage. If any damage is found, do not install and immediately contact Mercer Valve Co., Inc.
  • Page 10 The PRV should be oriented in a vertical position with its inlet pointing downwards and its outlet pointing in a horizontal direction. Mercer Valve Co., Inc. must be contacted to ensure proper operation if the valve cannot be installed in this orientation.

  • Page 11: Cap

    The built-up backpressure still cannot exceed the allowable overpressure. When greater built-up or variable superimposed backpressure exists, a 9100 Series valve may not be suitable and Mercer Valve Co. should be consulted prior to installation.
  • Page 12 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Extreme caution is required regarding the outlet piping if liquid can be present. The presence of liquid can increase the required force the valve needs to open and this alters the actual relief pressure.

  • Page 13: Operation

    INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Operation The Mercer Valve 9100 Series is an ASME Section VIII, Division 1 certified PRV for gas/ vapor and liquid applications. It has a set pressure definition for both gas/ vapor and liquid applications of a “POP.” When the valve reaches set pressure, the disk will open, creating a “POP” sound. The valve could exhibit simmer or warn before its set pressure but this is not considered the set point.

  • Page 14: Maintenance

    INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Maintenance For dependable performance, PRVs must be maintained regularly. Mercer Valve Co., Inc. recommends its PRVs are inspected and tested annually. After the valve has been installed and a service history has been established, the testing and inspection frequency may be adjusted. Some guidelines for testing frequencies can be found in NB-23, API 576, and API 598.
  • Page 15 When the start date is not specified, the following is what Mercer Valve Co. recommends for its products, which will clarify this ambiguity should the user/ owner of the PRV adopt it to their standards. This recommendation is irrespective of the warranty Mercer Valve Co.

  • Page 16: Inspections

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Inspections Pressure relief valves are used to help with safe operation of the system that they are installed on. They are designed to stop excessive over pressure scenarios. More information on causes of over pressure can be found in API 521.
  • Page 17 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Seal Wire Pressed Security Seal Figure 3: Typical Cap and Seal Wire  Flanged Connections – The flanges should be checked for wear, such as pitting, and any reduction in width that would cause improper sealing and reduction in pressure rating.

  • Page 18: B) Set Pressure Inspection

    The procedures for testing set pressure are as follows: 1. Check the set pressure definition from NB-18. For Mercer 9100 Series valves, a crisp “pop” is the definition of set pressure for both gas/ vapor and liquid valves.

  • Page 19: C) Leak Inspection

    If the valve has a CDTP, the leak test pressure will be below the CDTP in lieu of the set pressure. Mercer Valve Co., Inc. should be contacted for proper leak pressure and specification for the valve. In the tests, the pressure is held steady for a length of time and the valve is observed for any leakage.
  • Page 20 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Flow gauges can also be used to check for leakage. These tests are similar to the API 527 test except a flow gauge is attached to the outlet instead of a cup of water.

  • Page 21: Test Equipment

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Test Equipment Testing and inspections can be performed in multiple locations. They can be performed onsite in place (in situ testing), onsite on a mobile test unit, or offsite in a shop or test facility. Each environment offers its own advantages and disadvantages.

  • Page 22: B) Offsite Testing

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Figure 6: Picture of Typical In Situ Testing b) Offsite Testing Offsite testing allows for the most thorough and accurate testing and inspection. The valves are removed from the units and brought to a shop.

  • Page 23: C) Mobile Test Units

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL For liquid testing, the test bench, at a minimum, should have enough volume to perform 5 to 10 consecutive set pressure tests before the test stand has to be refilled with liquid. Approximately 2 (60 liters) of volume is required for most valves.

  • Page 24: D) Test Gauges

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL d) Test Gauges When testing the set pressure or leak checking, it is recommended that two pressure gauges are used. This enables quick identification if they are reading incorrectly. If the gauges are not reading identical values within their respective tolerances, it is an indication that at least one gauge is inaccurate and both should be checked to make sure they are calibrated correctly.

  • Page 25: Tester Qualifications

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 10. Tester Qualifications Only qualified individuals should perform PRV tests and repairs. They should be trained to test and calibrate pressure relief valves. They should understand how to properly operate the equipment and know the hazards involved.

  • Page 26: Tool List

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 11. Tool List The following Tool List shows the recommended tool to be used with an associated component. The list is not exhaustive and more tools that are not listed may be necessary.
  • Page 27 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL ® Fine Grade Abrasive Hand Pad (similar to Scotch-Brite™ 7447 ® Phenyl-Methyl Silicon Grease (similar to Molykote Water Resistant NLGI #2 Grease (similar to Aqua Lube Marine Grease) MERCER VALVE CO., INC.

  • Page 28: Disassembly

    See section 17. Always make sure there is no pressure in the system prior to removing a PRV. The 9100 Series contains several different orifice sizes. For most C to G orifices, the valves are bottom entry type with the bonnet integral to the body cavity. These valves have a removable inlet base.
  • Page 29 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 3. Relieve the compression on the spring by turning the adjustment screw counter clockwise. This is important so that components will not spring out and pose a hazard. If the adjustment screw...

  • Page 30: Center Bushing O-Ring

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Nozzle Nozzle Base O-ring Inlet Base Figure 14: Nozzle/Seat Subassembly of Bottom Entry Valve 10. Remove the lock nut and washer. See Figure 15.

  • Page 31: B) 2" Body - Bottom Entry

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 15. Unscrew the adjustment bushing from the adjustment screw. The adjustment bushing has left handed threads. See Figure 16. 16. PRV is disassembled.
  • Page 32 A replacement disk is included in the repair kit. a) Not all 9100 Series valve configurations have a lower spring guide. This component is used to guide the bottom of the spring on the top side of the disk.
  • Page 33 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Adjustment Screw Adjustment Screw O-ring Adjustment Bushing Figure 21: 2" Body Inner Bonnet Components If the center bushing is being removed, continue with the following. Otherwise, skip to step 19.

  • Page 34: C) Top Entry

    4. Remove the bonnet: a) H Orifice - The 9100 Series H orifice has a threaded bonnet. i) Rigidly support the body to prevent movement during disassembly. ii) Unscrew the bonnet from the body using the wrenching flats. The wrench flat width is 3-1/4”.
  • Page 35 Wrenching Flats Figure 25: 9100 Series Threaded H Bonnet b) J Orifice and Larger – The 9100 Series J orifice and larger has a bolted bonnet. i) Loosen each of the bonnet bolts in an alternating “star” pattern. ii) Remove and set aside all the bonnet bolts.

  • Page 36: Bonnet

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Nozzle Subassembly (Screwed In Type) Nozzle Base O-Ring Valve Body Figure 27: Top Entry Inner Components 9. Remove and discard the bonnet o-ring. This is located on the bottom side of the bonnet. See Figure 28.

  • Page 37: D) Lift Levers - Bottom Entry

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Adjustment Screw O-Ring Bonnet Figure 30: Top Entry Adjustment Screw O-Ring 14. Unscrew the adjustment bushing from the adjustment screw. The adjustment bushing has left handed threads.
  • Page 38 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 2. Bend straight and pull out the cotter pin. See Figure 33. Set it aside. i) A replacement cotter pin is not provided in the repair kit.
  • Page 39 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL O-Ring Seal Adjustment Nut (Closed Lift Lever) Lift Lever Lock Nut Lock Nut Figure 35: Removed Lift Lever Cap 7. Loosen the lock nut by using two additional jam nuts on the adjustment screw to prevent it from turning.

  • Page 40: E) Lift Levers - Top Entry

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL a) *These components do not have to be disassembled unless the center bushing o-ring is suspected of leaking. Removing these parts is not recommended.
  • Page 41 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL a) A replacement o-ring is included in the repair kit. O-Ring Figure 39: Pivot Block O-ring 4. Unscrew and remove the bolts attaching the lift lever cap to the bonnet. See Figure 40.
  • Page 42 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 6. Bend straight and pull out the cotter pin. Figure 41. Set it aside. i) A replacement cotter pin is not provided in the repair kit.

  • Page 43: Component Inspection

    INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 13. Component Inspection The following general procedure is recommended in the inspection of a 9100 Series PRV. New parts should be inspected. 1. Inspect the seat for cuts and abrasions. The seat is the non-metallic element in the nozzle subassembly.
  • Page 44 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL b) If the spherical surface is damaged or scratched, the disk needs to be replaced. 4. Referring to Figure 43, measure the diameter, �� . This diameter must be within the range of values listed in Table 4.
  • Page 45 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 6. Inspect the set spring for damage. Clean or replace the spring, if necessary. Check that the spring appears square. A spring with too much curvature can cause the valve to leak.

  • Page 46: Reassembly

    INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 14. Reassembly The following general procedure is recommended for the reassembling of a 9100 Series PRV. Parts should not be difficult to put back together and excessive force should never be used. a) Cleaning & Lubrication Cleaning: ...
  • Page 47 Figure 45: Adjustment Screw O-Ring Notch 6. Lightly lubricate the center bushing o-ring. a) Older 9100 Series may have two o-rings and two notches on the center bushing. 7. Carefully place the center bushing o-ring onto the center bushing. The o-ring should reside in a notch on the center bushing.

  • Page 48: Adjustment Bushing

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Nozzle Base O-Ring Apply Anti Seize Here Figure 47: Nozzle Pocket of Bottom Entry Valve 14. Put a dot of medium strength thread retainer onto the bottom of the threads of the nozzle. See Figure 52.
  • Page 49 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 24. Place the base seal onto the inlet base. See Figure 13. 25. Put a small amount of anti-seize on the threads of the inlet base that get screwed into the body.

  • Page 50: Ii) 2" Bodies - Bottom Entry

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Table 7: Lock Nut Torque Values Orifice Sizes Torque, lbf-ft (N-m) ± 5% C to G Lock Nut 25 (34) 1” & 2” Body Center Nut (Lift...

  • Page 51: Adjustment Screw

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 7. Lightly lubricate the center bushing o-ring. 8. Carefully place the center bushing o-ring onto the center bushing making sure not to cut the o- ring.
  • Page 52 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Apply Thread Retainer Here Figure 51: Thread Retainer on Center Bushing 12. Tighten the center nut against the center bushing. When tightening, use the flats on the center bushing to stop the center bushing from turning.
  • Page 53 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 26. Install the disk subassembly into the adjustment screw and spring. a) Do not put any lubricant on the disk or disk stem.

  • Page 54: Iii) Top Entry

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL a) If the has a lift lever option, utilize two jam nuts to turn and adjust the adjustment screw. See Figure 36. The jam nuts are tightened against each other to 100 lbf-ft (136 N-m).
  • Page 55 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL a) The adjustment bushing must slip into the valve bore freely but with little radial play. b) Remove and inspect/ re-clean parts if the fit is not correct.
  • Page 56 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 12. If you are converting from a K orifice to a J orifice, a conversion adapter will be required. This will need to be purchased separately and requires a special tool.
  • Page 57 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 22. Check and make sure the set spring slides over the disk or lower spring guide freely without sticking or binding. 23. With the body positioned upright, place the disk subassembly on the nozzle subassembly within the body cavity.

  • Page 58: C) Lift Levers - Bottom Entry

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 31. Check the lift of the valve. Refer to section “9 Test Equipment e) Lift Checking”. The measured lift of the PRV should meet or exceed the minimum lift denoted in NB-18 publication.
  • Page 59 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Continue with assembling the bottom portion of the PRV in section 14 b)i) step 12 for 1” and in section 14 b)ii) step 14 for 2” bodies.

  • Page 60: D) Lift Levers - Top Entry

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Hole Used for Lock-Wire Figure 60: Lift Lever Orientation and Lock Wire 18. Reassembly is complete. d) Lift Levers – Top Entry 1. Screw the two jam nuts onto the lift rod until the upper jam nut is flush with the top of the lift rod.

  • Page 61: Valve Setting Procedure

    1. Rigidly connect the valve to a test fixture. 2. For Mercer 9100 Series PRVs, a crisp “pop” is the definition of set pressure for both liquid and gas/ vapor valves. 3. Increase the spring tension by turning the adjustment screw in the clockwise direction.

  • Page 62: Tag Information

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 16. Tag Information Information and identification about the valve can be found on the tag, also called the nameplate. This information can be used to verify if the valve is installed in the proper service. It also can be used to get an appropriate replacement.

  • Page 63: Product Number System

    INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 17. Product Number System Not all code combinations are valid product numbers. Not all possible configurations are shown. Consult Mercer Valve Co., Inc. for any questions on valid product number configurations. a) Valve Product Numbering 9100 Series Threaded MERCER VALVE CO., INC.
  • Page 64 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 9100 Series Flanged MERCER VALVE CO., INC. RESERVES THE RIGHT TO CHANGE PRODUCT DESIGNS AND SPECIFICATIONS WITHOUT NOTICE. Rev.: J Date: 23-July-2020 ECN: 3152...

  • Page 65: 9100 Series Direct Spring Operated Pressure Relief Valve Installation, Operation, And Maintenance Manual B) Repair Kit Product Numbering

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL b) Repair Kit Product Numbering Parts Included in Repair Kit: 1. Nozzle Subassembly 2. Disk Subassembly 3. Base Seal (Bottom Entry Only) 4. O-ring Set Parts Not Included in Repair Kit: ...

  • Page 66: Exploded Views

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 18. Exploded Views Bottom Entry - 1” Body Figure 62: Exploded View of 1" Body See Table 13 for part identification. MERCER VALVE CO., INC. RESERVES THE RIGHT TO CHANGE PRODUCT DESIGNS AND SPECIFICATIONS WITHOUT NOTICE.
  • Page 67 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Bottom Entry - 2” Body Figure 63: Exploded View of 2" Body See Table 14 for part identification. MERCER VALVE CO., INC. RESERVES THE RIGHT TO CHANGE PRODUCT DESIGNS AND SPECIFICATIONS WITHOUT NOTICE.
  • Page 68 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Top Entry – Threaded Bonnet Figure 64: Exploded View of Top Entry Threaded Bonnet See Table 15 for part identification. MERCER VALVE CO., INC. RESERVES THE RIGHT TO CHANGE PRODUCT DESIGNS AND SPECIFICATIONS WITHOUT NOTICE.
  • Page 69 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Top Entry – Bolted Bonnet Figure 65: Exploded View of Top Entry Bolted Bonnet See Table 16 for part identification. MERCER VALVE CO., INC. RESERVES THE RIGHT TO CHANGE PRODUCT DESIGNS AND SPECIFICATIONS WITHOUT NOTICE.

  • Page 70: Cutaway View

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 19. Cutaway View Bottom Entry - 1” Body Figure 66: Cutaway View of 1" Body Table 13: Part Identification of 1” Body ITEM NO...
  • Page 71 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Bottom Entry - 2” Body Figure 67: Cutaway View of 2" Body Table 14: Part Identification of 2" Body ITEM NO PART NAME...
  • Page 72 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Top Entry – Threaded Bonnet Figure 68: Cutaway View of Top Entry Threaded Bonnet Table 15: Part Identification of Top Entry Thread Bonnet...
  • Page 73 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL Top Entry – Bolted Bonnet Figure 69: Cutaway View of Top Entry Bolted Bonnet Table 16: Part Identification of Top Entry Bolted Bonnet...

  • Page 74: Trouble Shooting Guide

    MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL 20. Trouble Shooting Guide The following describes some, but not all, problems that could occur in PRVs. This list is not exhaustive. Complicated problems and causes may exist, which require more involved solutions.
  • Page 75 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL i) Inspect the inside of the valve, the set spring, and the bore of the adjustment screw for build up or damages. c) Superimposed back pressure is causing the valve to remain closed.
  • Page 76 MERCER VALVE COMPANY, INC. 9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL CORPORATE HEADQUARTERS 9609 NW 4 STREET OKLAHOMA CITY, OK 73127 1-800-833-6402 PHONE: (405) 495-6533, FAX: (405) 495-8728 SALES@MERCERVALVE.NET FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.MERCERVALVE.NET...

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