Overview
The compact water-cooled Diffstak pumps with an integral cooled baffle offer exceptionally clean pumping with very low backstreaming, reduced outgassing, and a reduction in the number of elastomer seals required for installation.
The Edwards Diffstak 250 (ISO250 inlet) design has been proven over many years with thousands of pumps installed.
This pump has an unvalved ISO collar inlet flange and is supplied with: NW40 elbow, NW40 centering-ring, NW40 clamp, water pipe couplings and ferrules, inlet ISO 250 trapped ‘O’ ring.
* For maximum throughput
The Edwards Diffstak 250 (ISO250 inlet) design has been proven over many years with thousands of pumps installed.
This pump has an unvalved ISO collar inlet flange and is supplied with: NW40 elbow, NW40 centering-ring, NW40 clamp, water pipe couplings and ferrules, inlet ISO 250 trapped ‘O’ ring.
Technical Data
| Pumping speed | |
| nitrogen | 2130 l s-1 |
| hydrogen | 3200 l s-1 |
| Min backing pump displacement* | 40 m3h-1 |
| Recommended backing pump | E2M40 |
| Recommended fluid | Santovac® 5 |
| Fluid charge (dry) | 500 ml |
| Inlet connection compatible with | ISO250 |
| Backing connection | NW40 |
| Cooling water connection | 10 mm compression fittings |
| Heater power | 2.25 kW |
| Min cooling-water flow at 20°C | 180 l h-1 |
| Weight | 46 kg |
* For maximum throughput
US 18979 
GB 14217 
CA 11893 
AU 8526 
IE 5016 
BR 2419 
NZ 1734 
RU 921 
