Victaulic® FIRELOCK™ 746-LPA Series S004746005 Low Pressure Dry Accelerator

The series 746-LPA FireLock™ dry accelerator speeds the operation of the sprinkler's control valves by sensing the rapid decay of system pressure and exhausting air from the upper chamber of the actuating device. It attaches to the air supply's trim at the inlet of the dry actuator. System air pressure in the upper and lower chambers sets the dry accelerator in the closed position, which holds pressure in the air chamber of the actuating device. When a sprinkler opens and system air pressure releases, the air evacuates from the lower chamber faster than it does from the upper air chamber. As the air pressure in the lower chamber decreases, the pressure in the upper air chamber remains relatively higher. When a 3 to 5 psi differential occurs, the series 746-LPA FireLock™ opens and vents the lower chamber's air into the atmosphere. This action also exhausts the air quickly from the actuator, which causes the sprinkler valve to operate. The series 746-LPA FireLock™ features a unique, built-in check valve that allows rapid pressure equalization of the dry accelerator during system charging and fast response to variations in system air pressure. The series 746-LPA FireLock™ is equipped with all required parts and is easily attached to the valve trim without additional modification. The series 746-LPA FireLock™ dry accelerator is rated to 300 psi working pressure and is tested and UL Listed/FM approved for use with all sizes of Victaulic® series 768, series 769 fire safety valves.