Available in 2 in. and 16 in. through 35 in. sizes, the low-cost HS-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.

Key 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.