Rotary Claw Vacuum Pumps

Selectorr oil-less rotary claw vacuum pumps provide high efficiency on a multitude of applications. Direct driven by Nema flange motors, these pumps are equipped with anti suck-back valves and exhaust silencers.

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

Rotary Claw Vacuum Pumps: Oil-less
Model C2 C3 C5B C7LB C7B C10B C15B C30
Part # (with motor) 264341 264330 264331 264332 264333 264340 264334 264345
Part # (without motor) 264341‑LM 264330‑LM 264331‑LM 264332‑LM 264333‑LM 264340‑LM 264334‑LM 264345‑LM
Motor HP 60 Hz 2 3 5 7.5 7.5 10** 15 30
RPM 60/50 Hz 3450/2850 3450/2850 3450/2850 3450/2850 3450/2850 3450/2850 3450/2850 3450/2850
Inlet/Discharge Connections 1"/1" 1 1/2" 1 1/2" 2" 2" 3" 3" 4"*
dB(A), average 60 Hz 80 75 77 80 80 78 80 85
Approximate Weight Pump Only (lb.) 141 280 302 514 548 741 750 1730
Approximate Weight with Motor (lb.) 185 370 445 747 787 1063 1237 2135
Gear Box Oil Capacity (quarts) 0.4 0.5 0.5 1.0 1.0 2.0 2.0 3.4
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ACFM @ 0" 40 70 112 165 212 275 350 670
ACFM @ 10" 36 68 111 154 196 264 342 635
ACFM @ 15" 34 66 108 149 192 255 338 615
ACFM @ 19" 33 63 106 144 187 250 328 600
ACFM @ 22" 32 62 104 140 181 242 324 580
ACFM @ 25" 30 60 100 137 174 N.A. N.A. N.A.
Ultimate Vacuum, Max, " Hg. 27" 25" 25" 25" 25" 25" 25" 26"
Ultimate Vacuum, Continuous, " Hg. 26" 25" 25" 24" 24" 24" 23" 24"
SCFM @19" Hg. 12 23 39 53 69 92 120 220
* C30 inlet and discharge ports have flanged connections.
** For 230 or 208 volt operation, use 15 HP motor.


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.