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Rotary Claw Vacuum Pumps
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Ohio Medical Rotary Claw Vacuum Pumps

Ohio Medical's Selectorr oil-less rotary claw vacuum pumps provide high efficiency in a multitude of applications. Direct-driven by NEMA flange motors, these pumps are equipped with anti-suck-back valves, vacuum regulators at the pump inlet, and exhaust silencers.

All models can be operated continuously, with minimal maintenance required. Selectorr claws are well-suited for soil remediation, medical and lab vacuum, pneumatic conveying, and packaging.

Rotary claw vacuum pumps can operate continuously and dependably for long periods of time. Inlet filters are typically used for both vacuum and compressor applications in order to trap contaminants from entering the pumping chamber.

A claw vacuum pump consists of two rotors. The rotors turn in opposite directions, without contact, with very tight clearances. They are synchronized via a precision gear. As the claw moves over the suction connection and the axial suction channel inlet, gas is sucked into the compression chamber.

The revolving rotors move gas from the suction side to the pressure side. Then it is compressed by the reduction of the volume between the rotors until the lower rotor uncovers the discharge channel. This "internal compression" leads to high differential pressures at efficiencies of more than 60%. To remove the heat generated by the compression process, cooling air is sucked in between the compression housing and a silencing cover before leaving the pump.

  2 – 7.5 HP Rotary Claw Vacuum Pump Specifications & Performance:
Model C2 C3 C5B C7L C7
Pump with Motor 264341 264330 264331 264332 264333
Motor HP @ 60 Hz 2 3 5 7.5 7.5
RPM 60/50 Hz 3450 / 2850 3450 / 2850 3450 / 2850 3450 / 2850 3450 / 2850
Inlet / Discharge Connections 1" 1½" 1½" 2" 2"
Db(A), Avg. 60 Hz 79 82 77 82 83
Weight (lb.) 141 249 276 472 503
Oil Capacity (qt.) 0.8 0.8 0.8 1.2 1.2
Dimensions Schematic PDF Schematic PDF Schematic PDF Schematic PDF Schematic PDF
ACFM @ 0" 40 70 112 165 212
ACFM @ 10" 36 68 111 154 196
ACFM @ 15" 34 66 108 149 192
ACFM @ 19" 33 63 106 144 187
ACFM @ 22" 32 62 104 140 181
ACFM @ 25" 30 60 100 137 174
Ultimate Vacuum, Max., " Hg. 27" 25" 25" 25" 25"
Ultimate Vacuum, Cont.,
" Hg.
26" 25" 25" 24" 24"
SCFM @ 19" Hg. 12 23 39 53 69
  10 – 30 HP Rotary Claw Vacuum Pump Specifications & Performance:
Model C10 C15 C30
Pump with Motor 264340 264334 264345
Motor HP 60 Hz 10 15 30
RPM 60/50 Hz 3450 / 2850 3450 / 2850 3450 / 2850
Inlet / Discharge Connections 3" 3" 4" *
Db(A), Avg. 60 Hz 85 85 85
Weight (lb.) 680 688 1730
Oil Capacity (qt.) 1.2 1.2 3.4
Dimensions Schematic PDF Schematic PDF Schematic PDF
ACFM @ 0" 275 350 670
ACFM @ 10" 264 342 635
ACFM @ 15" 255 338 615
ACFM @ 19" 250 328 600
ACFM @ 22" 242 324 580
ACFM @ 25" n.a. n.a. n.a.
Ultimate Vacuum, Max, " Hg 25" 25" 26"
Ultimate Vacuum, Cont., " Hg" 23" 23" 24"
SCFM @ 19" Hg. 92 120 220
* C30 inlet and discharge ports have flanged connections.

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