The QSI "Quiet Single Impact" Series piston vibrators pair noise reduction with timed impact operation to reduce noise levels and energy usage while maintaining material flow.  Houston Vibrator, manufacturer of the patented QI (Quiet Impact) Series reduced noise piston vibrator, has expanded that line to include a Single Impulse version for timed impact applications. QSI Series piston vibrators deliver a single impulse on a timed cycle to promote material flow and prevent material buildup on hopper walls. QSI models can be operated using a pneumatic or electronic timer or PLC and a solenoid valve to deliver a single impact on a predetermined schedule, or they can be activated manually as needed using a self-closing valve.  QSI Series vibrators are applicable suitable in a wide variety of applications. For those customers currently using a standard Single Impulse or timed impactor, the QSI Series models will provide a reduction in noise with only a minor decrease in force. For those customers currently using standard impacting or Quiet Impact models, a QSI can drastically reduce air consumption and therefore energy costs while maintaining effective material flow. Ideal for dust collectors and batching equipment.