Victaulic FireLock NXT 768N Rebuild Instructions
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Victaulic FireLock NXT 768N Rebuild Instructions

Dry valves; deluge valves, and actuated valves with preaction trim
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REBUILD KIT INSTRUCTIONS
Rebuild Kit Instructions for Series 768N FireLock NXT
Series 769N FireLock NXT
Series 769N FireLock NXT
• Read and understand all instructions before attempting to install, remove, adjust, or perform maintenance on any Victaulic piping products.
• Depressurize and drain piping systems before attempting to install, remove, adjust, or perform maintenance on any Victaulic piping
products.
• Wear safety glasses, hardhat, and foot protection.
• Save this installation, maintenance, and testing manual for future reference.
Failure to follow instructions and warnings could cause system failure, resulting in death or serious personal injury and property damage.
REV_A
™
Deluge Valves, and
™
Actuated Valves with Preaction Trim
WARNING
I-768N/769N.RBKIT
™
Dry Valves,
I-768N/769N.RBKIT

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Summary of Contents for Victaulic FireLock NXT 768N

  • Page 1 WARNING • Read and understand all instructions before attempting to install, remove, adjust, or perform maintenance on any Victaulic piping products. • Depressurize and drain piping systems before attempting to install, remove, adjust, or perform maintenance on any Victaulic piping products.

  • Page 2: Table Of Contents

    I-768N/769N.RBKIT / Series 768N and Series 769N FireLock NXT ™ Valves / Rebuild Kit Instructions TABLE OF CONTENTS HAZARD IDENTIFICATION Hazard Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Definitions for identifying the various hazard levels are Overview of Replacement Parts .

  • Page 3: Overview Of Replacement Parts

    I-768N/769N.RBKIT / Series 768N and Series 769N FireLock NXT ™ Valves / Rebuild Kit Instructions OVERVIEW OF REPLACEMENT PARTS Dry Valve . NOTE: The trim for Series The following drawing identifies components with replaceable parts for a typical Series 768N FireLock NXT ™...

  • Page 4: Removing The System From Service

    I-768N/769N.RBKIT / Series 768N and Series 769N FireLock NXT ™ Valves / Rebuild Kit Instructions REMOVING THE SYSTEM FROM SERVICE Notify the authority having jurisdiction, remote station alarm Close the charge line ball valve . monitors, and those in the affected area that the system is being Open the system main drain valve to drain any water that has taken out of service .

  • Page 5: Instructions For Replacing Internal Valve Components

    I-768N/769N.RBKIT / Series 768N and Series 769N FireLock NXT ™ Valves / Rebuild Kit Instructions INSTRUCTIONS FOR REPLACING INTERNAL VALVE COMPONENTS Item Description Item Description Clapper Seal Cover Plate Gasket Seal Ring Seal Assembly Bolt/Bolt Seal Seal Washer* Clapper Shaft Bushing O-Ring Clapper Shaft Latch Shaft Bushing O-Ring Latch Shaft...
  • Page 6 I-768N/769N.RBKIT / Series 768N and Series 769N FireLock NXT ™ Valves / Rebuild Kit Instructions WARNING • Verify that the valve is depressurized and drained completely before the cover plate bolts are removed. Failure to follow this instruction could result in death or serious personal injury and property damage.
  • Page 7 I-768N/769N.RBKIT / Series 768N and Series 769N FireLock NXT ™ Valves / Rebuild Kit Instructions 10. Place a new latch shaft bushing o-ring (supplied with the kit) onto each latch shaft bushing . 10a. Apply thread sealant to each latch shaft bushing . Install the latch shaft bushings into the valve body until hand-tight .
  • Page 8 14. Rotate the clapper out of the valve body . Remove the seal seal . Contact Victaulic if the clapper requires replacement . assembly bolt/bolt seal from the clapper seal, as shown above .
  • Page 9 I-768N/769N.RBKIT / Series 768N and Series 769N FireLock NXT ™ Valves / Rebuild Kit Instructions 22. Align the holes of the new cover plate gasket (supplied with the kit) with the holes in the cover plate . 22a. Insert one cover plate bolt through the cover plate and cover plate gasket to ease alignment .
  • Page 10 I-768N/769N.RBKIT / Series 768N and Series 769N FireLock NXT ™ Valves / Rebuild Kit Instructions 24. Break the unions that connect the trim to the diaphragm cover . CAUTION Refer to the applicable trim drawing for details . • Use caution when installing a new diaphragm into the valve body.

  • Page 11: Assemblies And Actuators

    I-768N/769N.RBKIT / Series 768N and Series 769N FireLock NXT ™ Valves / Rebuild Kit Instructions MAINTENANCE OF AIR, PRIMING, AND ALARM MANIFOLD ASSEMBLIES AND ACTUATORS Air Manifold Assembly Priming Manifold Assembly O-Ring NOTE: The o-ring indicated is the same for the alarm manifold assembly and priming manifold assembly.

  • Page 12: Replacing The Cartridge In The Air And Priming

    Failure to follow this instruction could cause improper valve operation, resulting in property damage. Use only new, Victaulic-supplied o-rings and filters . Install the new o-ring and filter onto the filter adapter, as shown above . Carefully re-install the filter adapter into the actuator . Use caution to prevent damage to the o-ring .
  • Page 13 For complete contact information, visit victaulic.com I-768N/769N.RBKIT 8964 REV A UPDATED 11/2016 Z000768NRB VICTAULIC AND FIRELOCK NXT ARE REGISTERED TRADEMARKS OR TRADEMARKS OF VICTAULIC COMPANY AND/OR ITS AFFILIATED ENTITIES IN THE UNITED STATES AND/OR OTHER COUNTRIES. © 2016 VICTAULIC COMPANY. ALL RIGHTS RESERVED.

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