CEM – Gear pumps


Construction features:

Shaft: Steel
Mechanical seal: VITON (special corrosion-proof)

Bronze (B)
Pump body: Bronze, Gearings: Bronze

Cast Iron (G)
Pump body: Cast Iron G25, Gearings: Cast Iron G25



Self-priming volumetric gear electric pumps suitable for transferring of viscous liquids without any solid bodies in suspension such as lubricant oil, fuel oil and diesel oil
The GEAR ST series is fixed on a base and coupled to the engine by a flexible joint.

A gear pump uses the meshing of gears to pump fluid by displacement. They are one of the most common types of pumps for hydraulic fluid power applications. The gear pump was invented around 1600 by the German astronomer, mathematician, and astrologer Johannes Kepler

Gear pumps are also widely used in chemical installations to pump high viscosity fluids. There are two main variations; external gear pumps which use two external spur gears, and internal gear pumps which use external and internal spur gears (internal spur gear teeth face inwards, see below). Gear pumps are positive displacement (or fixed displacement), meaning they pump a constant amount of fluid for each revolution. Some gear pumps are designed to function as either a motor or a pump.

Direct current: 

  • Permanent Magnet motor 12/24V DC
  • Protection IP44
  • Insulation Class F
  • Continuous Duty (S1)

Alternating current:

  • Induction electric motor
    • 110V single-phase (MS) – 60Hz (available on request)
    • 230V single-phase (M) – 50Hz (60hz available on request)
    • 230~400VAC Three-phase – 50Hz (60hz available on request)
  • Protection IP55
  • Insulation Class F
  • Continuous Duty (S1)

Scope of operation: Liquid free of solid impurities
Temperature range of the liquid: from + 0 to + 120 °C
Viscosity of the liquid: 10°E max


  • By pass safety valve to install in the outlet to protect the pump from dangerous over pressures. The valve can be calibrated by acting on the adjusting screw
  • 6 poles motor suitable for liquids with viscosity from 10°E to 50°E
  • Mechanical seal for high temperature (max. 200 °C) made of WIDIA – VITON

Additional information


Bronze, Cast Iron


12V DC, 24V DC, 230V, 230~400V

Flow @ 5bar

5.3L/min, 10L/min, 15L/min, 25L/min, 35L/min, 50L/min, 60L/min, 70L/min, 115L/min, 164L/min, 212L/min, 258L/min, 314L/min, 365L/min, 415L/min, 515L/min, 620L/min

Flow @ 10bar

5L/min, 9.6L/min, 14.2L/min, 23.3L/min, 33.3L/min, 48.3L/min, 56.5L/min, 105L/min, 156L/min, 205L/min, 250L/min, 302L/min, 350L/min, 405L/min, 505L/min, 600L/min

About CEM

About CEM Pumps and Blowers

Established in 1970 C.E.M. elettromeccanica S.r.l. has been a leading manufacturer of electric pumps and DC motors primarily focussed for use in the maritime sector
In the 48 years we have been making motors and our constant expansion in the national and the international markets have resulted in the broadening of our extensive product range

highest quality materials

This makes us the ideal partner for large and medium-sized boat builders of pleasure, fishing and military vessels.
Our extensive range now includes:

  • DC and AC electric pumps
  • Belt driven pumps, with manual or electro magnetic clutch
  • hydraulically driven pumps
  • water pressure systems
  • centrifugal and axial blowers
  • diesel driven pumps
  • manual pumps
  • DC motors

Our commitment to using the highest quality materials used, the special care invested in the design and in the innovative production processes we adopt, we are able to offer excellent performances and a remarkable lifespan of our products exactly what you need when our product can offer extra hours of safety when in difficulty
All of our products are built to standards that are in accordance with classification and certification can be obtained from each of the bodies: Bureau Veritas, Det Norske Veritas (DNV), Lloyd’s Register and RINA