Claw Pumps
The Onion Equipments Claw is a vacuum or pressure pump operating on the rotary claw principle. The rotary claw principle is based on dry running, non contacting rotors. As the rotors rotate, a void is created on the inlet side of the pumping chamber pulling air inward. The trapped air is then pushed to the discharge side of the pumping chamber where it is first internally compressed then discharged. The standard Claw cannot be used to produce vacuum and pressure simultaneously. A Claw pump configured for vacuum operation will have the inlet port connected to the vacuum line, and the discharge port will be open to atmospheric pressure (through a silencer). A Claw pump configured for pressure operation will have the inlet port connected to the pressure line, and the inlet port will be open to atmospheric pressure (through a silencer and filter). Claw vacuum pumps have an ultimate pressure between 15 and 173 torr, depending on the model, and Claw pressure pumps have an ultimate pressure of 29.4 psig.
A small, fixed, gauged clearance is maintained between all of the moving parts in the pumping chambers. This means that there is no friction (no wear) in the pumping chamber and therefore no lubricant required in the pumping chamber. The wearing parts of the Claw are well isolated from the heat and contaminates usually found in pumping chamber. The wearing parts of the Claw primarily consist of bearings and gears which are thermally separated from the pumping chamber by a double endplate design with an atmospheric air space
The advantages :
  • Non-Contacting Design (No vanes to wear out) Up to 29” Hg Vacuum and 24 PSI
  • Dry (oil free) pumping chamber
  • Air cooled
  • Low maintenance- no wear in pumping chamber
  • Simple modular construction
  • Suitable for variable speed applications
  • Suitable for heavy moisture and dusty environments
  • Integral relief valve (Where necessary)
  • Lower power requirements than rotary vane and liquid rings due to frictionless pump chamber
  • 3 year standard warranty
The disadvantages :
  • Flow limited to 330 CFM
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