Precision Machine & Manufacturing, Inc.

Precision Machine & Manufacturing, Inc.

1290 S. Bertelsen Road Eugene, OR 97402

PMDS Self-Cleaning Rotary Valve

PMDS Self-Cleaning Rotary Valve

PMDS Self-Cleaning Rotary Valve

A mechanically self-cleaning rotary valve for applications where sticky or wet material can build-up in a conventional rotary valve or rotary feeder and disrupt feeding.  Two rotors – one for carrying the material and the second designed to sweep through the pockets on the first rotor – are timed together to effectively keep the rotor pockets clean and at full available capacity.  Using the same modular design principle as the PMV rotary valve, the PMDS is easy to maintain and rebuild if necessary.

Common Applications

  • Coal mill feeding
  • Dryer feed
  • Feeding reactor vessels
  • Lignite or other higher rank coal
  • Activated carbon
  • Biosolids
  • Diatomaceous earth
  • Specialty chemicals
  • Pet coke
  • Sugar beet pulp
  • Hemp

Key Advantages

  • Eliminates the requirement to regularly stop production to clean out a conventional rotary valve in order to maintain process capacity; saves manpower and keeps the process continuously operating.
  • Minimizes process capacity fluctuations that can arise from material build-up in conventional rotary valves feeding a mill, process vessel, or reactor.
  • Can make lignite coal an economically viable fuel alternative as a key material handling challenge associated with it can be managed.
  • Modular design makes field repairs a reality; saving money and potentially reducing the investment in spares.
  • Compliant with NFPA 69 and 85 standards

Problems Solved

High inherent-moisture coal or coal with lots of surface moisture can be effectively handled without material build-up; useful in situations where raw coal must be stored outside or where incoming coal is carried in open-top trucks or rail cars.

For applications where metering or airlock functionality is needed at the inlet to the heated vessel with steam escapement, the PMDS can minimize complications from the steam mixing with the incoming material.

More positive cleaning action than air assist, vibration, or other add-on features to conventional rotary valves

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