KHH High Vacuum Dry PumpHigh Vacuum 1.3kPa [abs] Continuous & Dry.


Ultimate Pressure
1.3 kPa [abs]
Flow Rate
179 L/min (60 Hz)
  • Continuous operation at ultimate pressure of 1.3 kPa or lower. Suitable for applications requiring high degree of vacuum.
  • Compact design thanks to direct connect motor flange.
  • Quiet operation, long life.


Model KHH251-101
Designed Pumping Capacity (50/60 Hz) ※1 L/min 149/179
Ultimate Pressure ※2 kPa [abs] or lower 1.3
Piping Connection Size   Hose nipple (ODΦ14)
Voltage (50/60 Hz) V Single-Phase 100 / Single-Phase 100
Standard Motor Current Rating (50/60 Hz) A 6.1/5.5
Operating Noise Level (50/60 Hz) ※3 dB 68/69
Built-In Motor kW 0.25
Mass kg 19
  1. Designed pumping capacity: Theoretical value calculated from cylinder volume. Refer to "Performance Data" for actual flow rate.
  2. Pump can be continuously operated at the maximum attainable vacuum.
  3. Operating noise level measured on a new pump with the standard built-in ORION motor. Operating noise levels are from a position of 1 m in front of the unit and at a height of 1 m.
  • Working vacuum range: 8 kPa (abs] to ultimate pressure. Please consult your dealer regarding continuous operation at levels on the dotted lines in the performance data charts. Models with ductable exhaust available (KHH251A) are also available. When ducting off exhaust, the allowable back pressure from the piping is 10kPa. (This pressure should not be used for any purpose.)
  • Operating environment (inlet air) conditions: air temp: 0 to 40 °C, humidity: normal levels (65+20%).
  • Operating environment (inlet air) conditions: air temp: 0 to 40 ℃, humidity: normal level (65±20%).
  • Due to the high compression ratios found in high-compression pumps, condensation can easily form within the pump. Therefore the following measures should be taken in order to avoid trouble from rust due to condensation: During a trial run (operation of 5 minutes or less, such as a momentary operation or short test run) if the operating pressure goes above 8 kPa (abs], then a dry run of 10 to 15 minutes should be made at a pressure of 8 kPa (abs) at the vacuum side of the pump.
  • Allowable intermittent power supply voltage fluctuation range is +10% of the specified voltage, allowable sustained supply voltage fluctuation range is +5% of the specified voltage.
  • Please install an overload protection device (such as a thermal relay). Setting guideline (may vary depending on the specific application): Use the current rating listed on the motor nameplate as a guide.
  • This is a precision made device. Please handle with care during shipping and installation.
  • Note: If detailed specifications are required, please Contact ORION to request a specifications sheet.

External Dimensions(Units:mm)


Performance Data