dhve-20 Diffusion Pumps Available in 2 in. and 16 in. through 35 in. sizes, the low-cost dhve-series pumps provide high speed, low ultimate pressure, high throughput, high tolerable forepressure, and low backstreaming. The HS-Series diffusion pumps come with full thermal protection and optional quick-cool coils. The 16 in. through 35 in. pumps come with sight glass/fill and drain assemblies, and are available with ASA or ISO flanges. Diffusion Pumps Features Five-stage fractionating jet purifies pumping fluid and assures low base pressure. High tolerable forepressure. Full thermal protection. Fluid-level sight glass provides quick indication of pump fluid status at all times. Fill and drain assembly for pump oil. Standard gauge port (NW-25) below inlet flange included. Foreline baffle prevents loss of fluid into backing pump system. Optional halo baffle reduces backstreaming without adding height. Ordering Details Download dhve-20 Diffusion Pump 3D Model Specifications Technical Specifications Pumping Speed, Operating Range Pumping Speed, AVS 4.1 (1963) 10, 000 l/s air, 12, 500 l/s He and H2 17, 500 l/s Air Maximum Throughput 12.5 T-l/s (16.7 mbar l/s) in operating range, 18 T-l/s (23 mbar-l/s) @ 0.01 torr Operating Range 1.3 x 10-3 to 5 x 10-8 torr (1.7 x 10-3 to 6.5 x 10-8 mbar) Maximum Forepressure No Load: 0.65 torr (0.85 mbar) Full Load: 0.55 torr (0.72 mbar) Recommended Backing Pump ɛ100 cfm (170 m3/hr) Backstreaming Rate, Standard Cold Cap <1.5 x 10-3 mg/cm2/min Warmup Time 45 minutes Cooldown Time 85 minutes Fluid Charge 5 quarts (4.7 liters) Electrical Requirements 3 ph, 50/60 Hz, 240/415/480 VAC Pump Power 12, 000 watts Cooling Water Requirements 1.5 gpm (300 l/hr) at 60-80°F (15-26°C) Water Connections 1⁄4 in. FPT Tee Recommended Fluid DC-704