3 Screw Pumps


PWO Series is one of the most successful products manufactured by SEIM, since ten years sold all over the world.

It’s the specific three rotors pump for cooling lubricant fluids (water based emulsion) and cutting oils at HIGH PRESSURE.

To implement further a successful product is quite challenging: SEIM succeeded making now triple its offer of PW pumps. No longer one choice, but three: the definitive Italian solution, which doesn’t fear competition in term of durability and reliability – and price competitiveness. Aside the consolidated PWO models, at today our line-up includes the PWA and PWE:

• The PWA pump, including Advanced SEIM technology – specific hardening process - suitable for pumping fluid with some grade of particles contamination.

• The PWE pump, the Evoluted screw pump for Extreme applications, with internal execution including high resistance to abrasion spindle set and casing.

Then the well-known and successful PWO Series got two “twin sized” models (PWA and PWE), both including the benefits for the PWO – last but not least the screw profile finishing, to grant top hydraulic performances.

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Specifications - Overall dimensions - Sales Catalogue
Design available SEIM standard. mechanical or radial seal - incl. versions with high wear resitant liner (models PWA and PWE)
Flow rate L/min 650
Flow rate m³/h 40
Flow rate USGPM 172
Suction pressure Mechanical seal: from -0,5 to 10 bar (-8 to 145 psi) - Radial seal: 0 to 1,5 Bar (0 to 22 psi) *
Delivery pressure 100 (opt.150)
Seal Radial or mechanical
Bearing Radial ball
Bearing lubrication Self-lubricated external
Drive typical 2900 to 3600 rpm, up to 4500 with VFD *
Construction shape SEIM standard. mechanical or radial seal - incl. versions with high wear resitant liner (models PWA and PWE)
IN/OUT SAE 3.000
Safety valve Available BVPA model as built-on, for sizes 025 to 045 *
  • Installation: Indoor or Outdoor. Horizontal or Vertical (also semi-submerged - top tank mounting)
  • Environment: Industrial, Marine
  • Amb. Temperature Min/Max:
  • Operating temperature C°: 32 - 212
  • Fluids: Water based emulsion (min. 5% oil content) - Cutting oils - Light fuel oils.
  • Solid content: ask SEIM for details
  • Viscosity range cSt: 1- 10 (400 opt.)
  • Viscosity range SSU: 31 - 60 (opt. 1770)
  • Speed: typical 2900 to 3600 rpm, up to 4500 with VFD *
  • Rotation (shaft view): Clockwise CW
  • Body/Flange: GG25 (GJL250)
  • O-rings: Viton ®
  • Painting: On demand


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