Water ring vaccum Type SRH

  • Features & Application
  • Selection chart
  • Principle

Water ring vaccum Type "SRH" Principle


When a proper capacity of liquid is supplied in the pump casing and the rotor is turned, liquid flows along the inner wall of the pump casing with the effect of centrifugal force. The inner wall of the casing is made eccentric with the pump axis, therefore a cavity of almost elliptical shape is produced in the center as shown in the flowing figure. The free surface of the liquid in the rotor pocket moves in the radial direction in accordance with the rotation of the rotor. The liquid free surface works as a piston. Then gas introduced from inlet port of rotor guide rotate by rotor and then discharged from the outlet port.

Influence of Seal Water Temperature

The vacuum pump is water seal type and a cavity in the pumping is filled with water vapor. The performance at low pressure is, therefore, influenced by the vapor pressure which is related to the temperature of suction gas and seal water.
The standard vacuum pump performance is based on suction temperature of 20 ˚C and seal water temperature of 15 ˚C. As the seal water temperature increases, the pump capacity is reduced. A simple approach to determine pump capacity is to apply the service correction factor. See following Figgure.

Influence of Seal Water Temperature