<img alt="" src="https://secure.leadforensics.com/92155.png" style="display:none;">


Coal Bunker Rapper

Mounted on coal bin
High voltage & collecting plate rapping

AVC Screen Rapper
Roof Mounted Rapper

Array of rappers on LPA screen

Product Image

Sample text of product information. Brand name, product type, date, anything of relevance to showcase information. 

Contact Us

Model SR-A1™ Rapper

The Model SR-A1™ Rapper, also known as the Hopper Rapper, is our most universally applicable rapper. Delivers 0-25 pounds of impact force at any mounting angle, even upside down. The Model SR-A1™ Rapper comes with a 6" square flange mount or a 2" diameter tapered mount.

The Hopper Rapper uses a heavy duty spring coil and 20 pound hammer design. When compressed, it generates the energy necessary to provide the impact force required. The hammer is fitted with two Teflon rings which eliminates friction to insure a long life with consistent results.

The unit is then sealed inside a steel tube with a shock isolating base/anvil.

The impact of the hammer in the Model SR-A1™ Rapper causes high peak acceleration in the connected surface or shaft. The rapid acceleration of the surface or plate or high voltage frame overcomes the adhesive force that binds many materials to them.

Performance Characteristics

  • Rapping Energy: Varries from 0-25 Ft-lb
  • Rapping Frequency: Varies from 1 rap/sec to 8 raps/sec
  • Ambient Temperature Range: -40°C to +70°C

Electrical Requirements

  • Input Voltage: 120-240 VDC, pulsed
  • Peak Current: 15 amps DC
  • Pulse Width: 25-125 ms, depending on impact desired


  • Electrically-welded steel tubing, 0.095" wall thickness
  • Surface treated with zing phosphate prior to assembly
  • Coil Assembly: Heavy Guage copper magnet wire with flexible end connections wet-wound around a fiberglass sleeve and encapsulated with epoxy-based electrical casting resin. Insulation tested for 1,000 megohms at 2,500 volts
  • Terminations: Two non-polarized coil terminals and on case ground terminal
  • Thermal cut-out switch imbedded in epoxy to insure against overheating
  • Paint: Forrest 673 Series, Red Wagon, powder coat. Certified -20°C to +125°C


  • CE & ATEX (Model SR-A1-IEC)



  • Low Total Cost of Ownership
  • Maximum operational performance
  • Higher accelerations versus electric or pneumatic vibrators
  • Multiple mounting configurations



  • 3-year warranty on all mechanical components, exclusive of removal/reinstallation and freight charges
  • 1-year warranty on all electrical components, exclusive of removal/reinstallation and freight charges
  • Strength and frequency of impact of the rapper is controlled by the application of 120V DC, 10A pulses from the rapper controller


SR-A1™ Rapper from AVC

Since 1977, AVC has lead in the development, distribution, and maintenance of Electrostatic Precipitators (ESPs) used in industries worldwide. AVC builds top-of-the-line voltage controllers, rapping systems, and replacement components for ESPs. By providing devices like the Hopper Rapper, AVC has built a reputation for excellence that has made us a driving force in the field.™

Devices like the Hopper Rapper help solve the problem of unwanted particles accumulating and reducing the effectiveness of the ESP by cleaning grounded plates and removing particulates efficiently. This allows ESPs to perform at maximum productivity. In a variety of environments, our rappers ensure swift, responsible disposal of fine particles. We keep the gasses clean and flowing. At every stage, AVC brand has it covered.

Industry leaders in biomass power, petroleum refining, chemical product manufacturing, and cement production industries come to us for parts and systems. If it deals with ESPs, we are the one to call. AVC provides expert clean/dirty inspections, repairs, and upgrades to confirm and safeguard that your equipment remains efficient and state-of-the-art. Our resources and know-how are unparalleled in the industry. That is why we are trusted all over the world in some of the most strenuous and hazardous conditions.

At AVC, we make the best products for the best people.