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Victaulic 746 Series Instructions Manual

Victaulic 746 Series Instructions Manual

Dry accelerators

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INSTALLATION AND REPAIR KIT INSTRUCTIONS
Series 746 and 746-LPA Dry Accelerators
INSTRUCTIONS FOR INSTALLING AND REPAIRING DRY ACCELERATORS
IMPORTANT INFORMATION
WARNING
• Read and understand all
• Wear safety glasses, hardhat, and
Failure to follow these inst ructions
could result in serious personal
injury, property damage, and/or
product failure.
The following information is a guide for proper installation of Victaulic Series 746 and Series 746-LPA Dry Accelerators. Always refer to the
installation, maintenance, and testing manual for the applicable valve for detailed system setup, operation, and maintenance instructions.
NOTE: THE SERIES 746 DRY ACCELERATOR SHOULD NOT BE USED ON VALVES EQUIPPED WITH SERIES 776 LOW-PRESSURE
ACTUATORS, SERIES 767 ELECTRIC/PNEUMATIC ACTUATORS, OR SERIES 798 DOUBLE-PNEUMATIC ACTUATORS. FOR THESE
INSTALLATIONS, A SERIES 746-LPA DRY ACCELERATOR MUST BE USED.
Dry Accelerators are quick-opening devices, which exhaust air from the actuator to speed valve operation.
A diaphragm separates the Dry Accelerator into two chambers. The closing chamber contains a compression spring, which maintains the chamber
in the closed position. The closed position is maintained as long as the pressure differential between the opening and closing chambers is less than
3 psi/0.2 Bar.
When the system introduces air pressure into the dry accelerator, air enters the closing chamber and passes through a check valve to the opening
chamber. The check valve, which allows flow into the opening chamber, prevents pressure from escaping the opening chamber. Therefore, air can
escape only through the flow restrictor.
When a rapid loss of system air pressure occurs, such as an open sprinkler, air escapes from the closing chamber faster than it escapes from the
opening chamber. As the sprinkler system's pressure continues to decay, a differential pressure develops across the diaphragm. When this differential
pressure reaches 3 – 5 psi/0.2 – 0.3 Bar, the opening chamber's pressure overcomes the compression spring's closing force, causing the closing
chamber to open to the atmosphere. The closing chamber opens immediately and releases pressure from the actuator, resulting in valve operation.
NOTE: The Series 746-LPA Dry Accelerator must be used only on systems operating below 20 psi/1.4 Bar of air. If air pressure higher than
20 psi/1.4 Bar is required, the Series 746 Dry Accelerator should be used.
www.victaulic.com
VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA.
REV_D
instructions before attempting
to perform maintenance on any
Victaulic piping products.
foot protection.
I-746/746-LPA
WARNING
• Depressurize and drain the
piping system before attempting
to remove, adjust, or perform
maintenance on any Victaulic
piping products.
Failure to follow this instruction
could result in serious personal injury
and/or property damage.
I-746.LPA_1

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Summary of Contents for Victaulic 746 Series

  • Page 1 The following information is a guide for proper installation of Victaulic Series 746 and Series 746-LPA Dry Accelerators. Always refer to the installation, maintenance, and testing manual for the applicable valve for detailed system setup, operation, and maintenance instructions.
  • Page 2 Button-Head Cap Screw Illustration is exaggerated for clarity * Denotes components that can be replaced in the field www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_2...
  • Page 3 • The Series 757P AMTA must not be used in any system installed with a Series 746 Dry Accelerator, unless a tank and an air regulator are added. www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_3...
  • Page 4: Installation

    *TEFLON IS A REGISTERED TRADEMARK OF THE DUPONT COMPANY. www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_4...
  • Page 5 Diaphragm for use in Design “A” Series 746-LPA Dry Accelerators or Design “A” Series 746 Dry Accelerators Flow Restrictor O-Ring Check Valve www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_5...
  • Page 6 Open the ¼-turn vent ball valve of the Dry Accelerator. Confirm that the gauge on the accelerator reads 0 psi/0 Bar. www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_6...
  • Page 7 Keep these cap screws for re-installation. Remove the load screw. Keep this load screw for re-installation. www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_7...
  • Page 8 Align the holes in the diaphragm with the holes in the actuator shaft and lower housing. www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_8...
  • Page 9 16. Using an adjustable wrench, install the NEW check valve with o-ring into the piston. 13. Install the NEW flow restrictor (provided with the kit) into the piston. www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_9...
  • Page 10 19. Follow all instructions in the “Placing the System Back in Service Section. www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_10...
  • Page 11 Using a 9/64-inch hex wrench, remove the cap screw that retains the piston. Keep this cap screw for re-installation. www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_11...
  • Page 12 10. Install a NEW o-ring (provided with the kit) into the recess in the shaft. piston that IS NOT counterbored. www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_12...
  • Page 13 13. Make sure a NEW o-ring is installed on the NEW check valve. 17. Follow all instructions in the “Placing the System Back in Service Section. www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_13...
  • Page 14 Using a 9/64-inch hex wrench, remove the four cap screws from the lower housing. Keep these cap screws for re-installation. Remove the piston. Keep the piston for re-assembly. www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_14...
  • Page 15 11. Install the NEW shield, provided with the kit. Make sure the three holes in the shield align properly with the three holes in the diaphragm, as shown above. www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_15...
  • Page 16 18. Follow all instructions in the “Placing the System Back in Service Section. www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_16...
  • Page 17 Notify the authority having jurisdiction that the valve has been the isolation ball valve. placed back in service. *TEFLON IS A REGISTERED TRADEMARK OF THE DUPONT COMPANY. www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_17...
  • Page 18 “button” is facing down (toward the actuator). pressure is introduced). www.victaulic.com VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. REV_D I-746/746-LPA_18...
  • Page 19 INSTRUCTIONS FOR INSTALLING AND REPAIRING DRY ACCELERATORS For complete contact information, visit www.victaulic.com I-746/746-LPA 4603 REV D UPDATED 03/2012 Z000746LPA VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2012 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA. I-746/746-LPA...

This manual is also suitable for:

746-lpa series