Oil Rotary Vacuum Pump

GLD・GLS Series



2-stage evacuation system / with backflow prevention / with gas ballast mechanism / with thermal protector / with switch / with input terminal (without cord)


  • The two-stage exhaust system has lower pressure (good vacuum) than the one-stage exhaust system.
  • Low noise and low vibration.
  • The backflow prevention mechanism prevents oil from flowing back to the vacuum chamber when it is stopped due to a power failure.
  • The exhaust speed is stable due to the installation of the forced oil supply mechanism.
  • Operation from atmospheric pressure is possible.
  • Easy connection by internal components knock pins and maintenance by flange motor.


  Unit 50Hz 60Hz
Actual pumping speed
L/min 135 162
Ultimate pressure※1
Pa 0.67
    Single phase, 100~120V/200~240V , 400W, 4P
Full load current
A 6.8 (100~120V)
3.5 (200~240V)
5.8 (100~120V)
2.9 (200~240V)
Oil capacity
mL 1,000
Recommended oil
kg 29
Inlet port diameter
mm KF-25
Ambient temperature
External dimensions
mm 170(W)×487.5(L)×249.5(H)
※1:Ultimate pressure is measured by Pirani gauge.
   (In the case of measurement by McLeod gauge, the value is lower by an order of magnitude for pumps with an Ultimate pressure of 1.3 Pa or less.)
※2:Power supply plug and Power supply code are not included.

Corresponding certificate/Voltage

Model Applicable standard CE
Declartion of confirmity





●:Standard、○:Option、-:Not Applicable
TUV Certification: A high-quality product that complies with European standards as assessed by an international third party that conducts product safety testing and certification.
cTUVus Certification: A high quality product that complies with Canadian and US standards as assessed by an international third party that conducts product safety testing and certification.


Oil is deteriorated with operating, and becomes the factor of performance shortage.
A decrease and the dirt of oil are confirmed, and please regularly add and replace it.
The backflow prevention valve mechanism prevents the pump oil backflow to the vacuum tank side at the time of emergency such as power failure.
Please make a suction side into atmospheric pressure when the pump is stopped for a long time.
Oil smoke from the exhaust port (oil mist) is especially generated near atmospheric pressure.
It is not suitable for the pump if operation is performed continuously at a high evacuation pressure of 10kPa or more.
There is a risk of explosion. Never block the outlet or operate the pump with equipment mounted at the outlet side that blocks the passage of gas.
Otherwise, the internal pump pressure increases causing the pump to explode, the oil level gauge to protrude or the motor to be overloaded.
This motor houses an automatic returning thermal protector, which may be activated in case of trouble.
The motor will restart automatically when the temperature goes down.
If the thermal protector is activated, switch off the power immediately for safety reason.

Dimension drawing


Pumping Speed Curves


Optional parts


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