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I-768N 

/ Series 768N FireLock NXT

 Dry Valve

 

/ Installation, Maintenance, and Testing Manual

installed on the charge line downstream of the priming manifold 
assembly. Another option is to install a Series 75B Supplemental 
Alarm Device.

7.  Pitch the water supply piping.

 Per NFPA 13 requirements, piping 

must be pitched so that  systems can drain properly. For areas that 
are subject to high levels of condensation, or where piping is not 
properly pitched, an optional Series 75D Water Column Device kit 
is available to assist in a utomatically draining water out of the riser.

8.  IF THE INLET WATER SUPPLY IS INTERRUPTED FOR ANY 

REASON, AND SYSTEM SUPPLY PRESSURE TO THE VALVE 
DECREASES, ENSURE THAT THE CHARGE LINE IS FULLY 
PRESSURIZED BEFORE PLACING THE  SYSTEM BACK IN 
SERVICE.

HYDROSTATIC TESTING

 WARNING

•  If air testing is required, DO NOT exceed 

50 psi/345 kPa/3.4 Bar  air  pressure.

Failure to follow this instruction could result in 
death or serious personal injury and property 
 damage.

The Series 768N FireLock NXT Dry Valve is cULus Listed and 
FM Approved for a maximum working pressure of:

 

  •  300 psi/2065 kPa/20.7 Bar 

The Series 768N FireLock NXT Dry Valve is factory tested to:

 

  •  600 psi/4135 kPa/4.1 Bar  (all  sizes) 

The valve can be hydrostatically tested against the clapper at:

 

  •  200 psi/1380 kPa/13.8 Bar  or  50 psi/345 kPa/3.4 Bar  above   
    the normal water supply pressure (2-hour limited time period) for  
    acceptance by the authority having jurisdiction

RECEIVING THE SHIPMENT

NOTICE

•  Drawings and/or pictures in this manual may be exaggerated for 

clarity.

•  This product and this installation, maintenance, and testing 

manual contain trademarks, copyrights, and/or patented features 
that are the exclusive property of Victaulic.

The components shaded in orange below are shipped separate from 
the valve and must be installed in accordance with the trim drawing 
provided. 

NOTE:

 The Vic-Quick Riser (VQR) assembly is shown.

1.

  Ensure that all components are included in the shipment and that 

all necessary tools are available for installation. Verify that the 
provided trim drawing matches the system’s requirements.

 CAUTION

•  Ensure that all protective shipping items are removed from the 

interior and exterior of the valve body before installation.

•  Ensure that no foreign material gets into the valve body, pipe 

nipples, or valve openings.

•  If using any material other than PTFE thread sealant tape, use 

extra caution so that material does not enter the trim.

Failure to follow these instructions could cause improper valve 
operation, resulting in personal injury and property damage.

2.

  Remove all plastic caps and foam spacers from the valve.

3.

  Install the valve assembly into the riser with two Victaulic rigid 

couplings. Refer to the instructions, supplied with the coupling, for 
complete installation requirements. 

SERIES 768N FIRELOCK NXT 

DRY VALVES MUST BE INSTALLED ONLY IN THE VERTICAL 
POSITION WITH THE ARROW ON THE BODY POINTING 
UPWARD.

4.

  For components shipped separate from the valve, apply a small 

amount of pipe joint compound or PTFE thread sealant tape to 
the external threads of all threaded connections. DO NOT get any 
tape, compound, or other foreign material into the openings of the 
threaded connections.

4a.  FOR VALVES INSTALLED WITH A SERIES 746-LPA DRY 

ACCELERATOR: 

The end with the vent seal “button” must be 

installed facing down (toward the trim), in accordance with the trim 
drawing provided.

Compression Fitting and Tube Configuration 

for Auto Drain and Alarm Manifold Assembly

Compression Fitting and Tube Configuration 

for Actuator

5.

  Compression fittings and tubes are provided for connection 

from the outlet of the auto drain, alarm manifold assembly, and 
actuator to the drip cup or drain. Install the compression fittings 
in accordance with the trim drawing provided. 

NEVER INSERT 

A PLUG INTO THE OUTLET OF THE AUTO DRAIN, ALARM 
MANIFOLD ASSEMBLY, OR ACTUATOR IN PLACE OF THE 
COMPRESSION FITTING/TUBE.

I-768N_5

REV_C

Содержание 768N FireLock NXT Series

Страница 1: ...ore 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 fo...

Страница 2: ...se the 1 4 turn vent ball valve Step 9b If a Series 746 LPA Dry Accelerator is installed open the isolation ball valve This will set the accelerator Step 10 Open the water supply main drain valve Step...

Страница 3: ...the water flow alarm test will be performed 2 Open the water supply main drain valve fully to flush the water supply of any contaminants 3 Close the water supply main drain valve 4 Open the alarm test...

Страница 4: ...failure resulting in death or serious personal injury and property damage 1 Read and understand all instructions and refer to the trim diagrams before installing maintaining or testing this Victaulic...

Страница 5: ...Vic Quick Riser VQR assembly is shown 1 Ensure that all components are included in the shipment and that all necessary tools are available for installation Verify that the provided trim drawing match...

Страница 6: ...ns inches mm Approx Weight Each lbs kg A A1 B C D D1 E F G H K Without Trim With Trim 1 9 00 16 37 32 75 9 25 16 50 11 00 9 25 3 25 10 25 22 50 6 00 16 7 43 0 228 60 415 80 832 235 419 279 235 83 260...

Страница 7: ...FireLock NXT Dry Valve 2 FireLock Rigid Coupling 3 Water Supply Main Control Valve 4 Drip Cup 5 Water Supply Main Drain Valve Flow Test 6 System Pressure Gauge Gauge Valve Assembly 7 System Main Drai...

Страница 8: ...ssembly Bolt 8 Clapper Spring 9 Clapper Shaft 10 Clapper Shaft Bushing and O Ring Qty 2 Item Description 11 Cover Plate 12 Cover Plate Gasket 13 Cover Plate Bolts 14 Latch 15 Latch Spring 16 Latch Spr...

Страница 9: ...unted air compressor provides the greatest protection for systems When shop air or a tank mounted air compressor is used the Series 757 Regulated AMTA must be installed The Series 757 Regulated AMTA p...

Страница 10: ...I 768N Series 768N FireLock NXT Dry Valve Installation Maintenance and Testing Manual SECTION I Initial System Setup I 768N_10 REV_C...

Страница 11: ...st ball valve is closed Step 4 Charge the system with air by turning on the compressor or by opening the fast fill ball valve on the AMTA Charge the system to 13psi 90kPa 0 9Bar minimum Refer to the A...

Страница 12: ...ater to flow through the auto drain tube Step 9 Verify that the charge line pressure is equal to the supply pressure and verify that the auto drain is set by pulling up on the auto drain sleeve Step 9...

Страница 13: ...jurisdiction remote station alarm monitors and those in the affected area that the system is in service Valve Normal Operating Position Water Supply Main Control Valve Open Water Supply Main Drain Va...

Страница 14: ...I 768N Series 768N FireLock NXT Dry Valve Installation Maintenance and Testing Manual SECTION II Resetting the System I 768N_14 REV_C...

Страница 15: ...main drain valve Confirm that the system is drained Step 3a Push in the ball drip plunger to release pressure Step 4 Close the system main drain valve Step 5 Confirm that all system drains are shut an...

Страница 16: ...accordance with current NFPA 25 requirements or in accordance with the requirements of the local authority having jurisdiction whichever is more stringent Always refer to the instructions in this man...

Страница 17: ...echanical damage and corrosion Replace any damaged or corroded parts 4 Confirm that the dry valve and trim are located in an area that is not subject to freezing temperatures 5 Confirm that all valves...

Страница 18: ...quirements The frequency of inspections must be increased in the presence of contaminated water supplies corrosive scaling water supplies and corrosive atmospheres Any activities that require taking t...

Страница 19: ...water supply main drain valve is fully open record the water supply pressure from the water supply gauge as the r esidual pressure 8 Close the water supply main drain valve slowly 9 Record the water p...

Страница 20: ...upply main drain valve fully to flush the water supply of any contaminants 3 Close the water supply main drain valve 4 Open the alarm test ball valve Confirm that mechanical and electrical alarms are...

Страница 21: ...ow air alarm activates 8 Close the system main drain valve 9 Close the slow fill ball valve on the AMTA if equipped 10 Open the fast fill ball valve on the AMTA Bring the pressure back up to the norma...

Страница 22: ...drain valve fully to flush the water supply of any contaminants 4 Close the water supply main control valve to the point where additional closure will not provide flow through the water supply main dr...

Страница 23: ...alve fully to flush the water supply of any contaminants 4 Close the water supply main drain valve 5 Open the remote system test valve inspector s test connection to simulate the operation of a sprink...

Страница 24: ...f the local authority having jurisdiction whichever is more stringent Always refer to the instructions in this manual for additional inspection and testing requirements The frequency of inspections mu...

Страница 25: ...e removed Failure to follow this instruction could result in death or serious personal injury and property damage 11 After all pressure is released from the system loosen the cover plate bolts slowly...

Страница 26: ...ntaining the fire protection system in proper operating condition To ensure proper system operation valves must be inspected in accordance with current NFPA 25 requirements or in accordance with the r...

Страница 27: ...ION Use only Victaulic supplied replacement parts Failure to follow this instruction could cause improper valve operation resulting in property damage 6 Pry the clapper seal along with the seal ring o...

Страница 28: ...Y BOLT BOLT SEAL TORQUES Nominal Size inches or mm Required Torque inch lbs N m 1 1 2 40 5 2 40 5 2 1 2 90 10 76 1mm 90 10 3 90 10 4 110 12 165 1mm 160 18 6 160 18 8 160 18 12 Replace the cover plate...

Страница 29: ...haft bushings into the valve body until hand tight 9b Tighten the clapper shaft bushings until metal to metal contact occurs with the valve body DO NOT exceed 10 ft lbs 14 N m of torque on the clapper...

Страница 30: ...2 1 2 60 81 76 1mm 60 81 3 60 81 4 100 136 165 1mm 115 156 6 115 156 8 100 136 6 Place the system back in service by following the Resetting the System section REMOVING AND REPLACING THE DIAPHRAGM 1...

Страница 31: ...e Required Internal Inspection section 2 Remove the existing cartridge from the air manifold and priming manifold assemblies shown above Rinse the cartridges to remove any deposits 3 Install the corre...

Страница 32: ...I 768N Series 768N FireLock NXT Dry Valve Installation Maintenance and Testing Manual SECTION VII Troubleshooting I 768N_32 REV_C...

Страница 33: ...ricting airflow When the AutoVent Sleeve of the Series 776 Low Pressure Actuator is pulled up the screw does not stay set in the UP position The Series 776 Low Pressure Actuator is not receiving enoug...

Страница 34: ...it und ohne Schnell ffner S 746 LPA Approval no G4070037 Name of product NXT S 768 DN 100 mit und ohne Schnell ffner S 746 LPA Approval no G4070038 Name of product NXT S 768 DN 150 mit und ohne Schnel...

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