What makes polyol difficult to pump
The pump is sized at the coldest working temperature and turns slowly, so the gear teeth fill completely.
How we build the pump for polyol
| Recommended series | ZV · NAV |
|---|---|
| Flow range of these series | 0.47 – 2,770 l/min (0.03 – 166 m³/h) |
| Body material | Cast iron as standard; stainless steel NAV for aggressive variants |
| Heating | Recommended in cold climates, for long storage or where the product thickens at night |
| Speed | Low speed: a larger pump turning slowly, often with a gear motor or inverter |
| Shaft seals | Selected for the fluid and the working temperature |
| Connections | NAV: flanged DN 40 – DN 125 PN 16; ZV: threaded ports, close-coupled to the motor |
Polyol with cyclopentane
Pre-blended polyol with cyclopentane as blowing agent is common in refrigerator and panel plants. It brings a flammable component into the dosing line, so ATEX evaluation becomes part of the pump selection, together with seals compatible with the blend.
Where polyol pumps work
Applications: PU foam lines (mattresses, panels, refrigerators), spray foam rigs, polyol blending and storage, CASE formulations.
Typical markets: Turkey, Egypt, Saudi Arabia, UAE, Iran, India, Vietnam, Indonesia, Mexico, Brazil. For these sites we size for local conditions: the coldest night temperature, 50 or 60 Hz power, heating available on site and spare parts that can be kept in stock locally.
Recommended pump series
Data we need to size your polyol pump
- Product name, producer or data sheet of the polyol
- Viscosity at the pumping temperature, and the lowest temperature on site
- Flow rate required (l/min, m³/h or bbl/h)
- Discharge pressure, or line length, diameter and height
- Suction: tank, line length and diameter, liquid level
- Power supply: voltage and 50 or 60 Hz
Frequently asked questions
Which gear pump do you recommend for polyol?
We normally propose the ZV or NAV Series. The ZV is compact, for small flows and dosing, close-coupled to the motor. The final model depends on flow, viscosity at temperature and suction, and is confirmed by our technical office.
Why do you size the pump for polyol larger than the flow requires?
Because a viscous fluid needs time to fill the gear teeth. A larger pump turning slowly fills completely, runs quietly and wears far less than a small pump at high speed.
Do you supply pumps outside Italy?
Yes. The pumps are built in our Bologna workshop and quoted for export. Write your country in the form and we will size the pump for your power supply (50 or 60 Hz) and site conditions.
This page also covers: Polyol blends, Polyol additives, Polyol and cyclopentane, Polyol or isocyanate.