Diffstak 250/2000P

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 a pneumatically actuated high vacuum isolation valve and is supplied with: NW40 elbow, NW40 centering-ring, NW40 clamp, water pipe couplings and ferrules, inlet ISO 250 trapped ‘O’ ring.

Dane techniczne
Pumping speed  
   nitrogen 2000 l s-1
   hydrogen 3000 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
Pneumatic connections 6mm coupling x ¼ BSP male stud
Pneumatic actuating pressure  
   Minimum 2.4bar / 35psi
   Maximum 6.9bar / 100psi
   250/2000M 59kg
   250/2000P 60kg

* For maximum throughput
250/2000P only