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 63 (ISO63 inlet) design has been proven over many years with thousands of pumps installed.

This pump has a manually operated high vacuum isolation valve and is supplied with: NW10 elbow, NW10 centering-ring, NW10 clamp, water pipe couplings and ferrules, inlet ISO63 Co-Seal.

Pumping speed
nitrogen	135 l s-1
hydrogen	200 l s-1
Min backing pump displacement*	5 m3h-1
Recommended backing pump	RV5
Recommended fluid	Santovac® 5
Fluid charge (dry)	60 ml
Inlet connection compatible with	ISO63
Backing connection	NW10
Cooling water connection	6 mm compression fittings
Heater power	0.45 kW
Min cooling-water flow at 20°C	42 l h-1
Pneumatic connections	6 mm coupling x ¼” BSP male stud
Pneumatic actuating pressure
Minimum	2.4 bar / 35 psi
Maximum	6.9 bar / 100 psi
Weight	9 kg

* For maximum throughput. For applications where maximum throughput is not required, use an RV3.