Two-Stage CRVPro Series Rotary Vane Pumps

Explore our Portfolio of Two-Stage CRVPro Series Rotary Vane Pumps


For more than 65 years, Welch has provided oil-sealed, rotary vane pumps to fulfill customer needs in laboratory and industrial applications. Welch’s pumps are well known for their high water vapor tolerance, which leads to an outstanding reliability for chemical applications. 
Welch's direct-driven rotary vane pump is lubricated automatically at an optimized oil pressure, resulting in lower ultimate pressures and stabilized temperature, thereby extending its lifespan. Made with selected materials that offer good chemical resistance, it is a suitable portable partner for a wide range of applications in laboratories and industrial environments. 
For all of our rotary vane pumps, customers can select from a variety of accessories to design a pump based on their individual needs. Welch also offers pre-defined accessory packages for various applications based on long term application experience. 

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Rotary Vane Pumps Overview

Rotary Vane Pumps are positive displacement pumps which create vacuum through rotation of one or more vanes inside the pump chamber. They are also referred to simply as rotary vacuum pumps, or alternatively, vane vacuum pumps.

The new CRVpro family of direct drive lab vacuum pumps is more reliable and has longer service intervals than comparable direct drive rotary vane vacuum pumps, and they use up to 36% less oil. Three features contribute to these benefits: they run 10°C cooler than comparable pumps (slowing corrosion), have a 40% larger oil capacity (diluting aggressive chemicals), and have a chemical resistant coating in the oil case and rotary.

The CRVpro dual stage rotary vane pump family includes all the features you'd expect in a direct drive two-stage pump: gas ballast, forced oil lubrication, anti-suckback mechanism and thermal overload protection.

It is designed for applications such as vacuum ovens, industrial applications, vacuum manifolds (Schlenk Lines), freeze dryers (Lyophilisation), glove boxes, vacuum concentrators, HVAC or as a backing pump for high vacuum systems such as mass spec devices.

Why Choose Welch?

Welch is a recognized provider of Vacuum Pumps, Systems and Fittings for Industrial and Laboratory Applications. We continually deliver products meeting the strictest requirements for mission-critical applications, and provide a comprehensive offering of products and great engineering capabilities to fit our customers’ needs.

As a reliable and trusted partner, we stand up to the challenge of supplying best-in-class products and solutions on time to manufacturers of equipment in the life sciences, healthcare, and industrial segments.

High Quality Standards

At Welch, we are committed to delivering the highest quality products and services in the industry, and this ethos is woven through every part of our design and manufacturing processes. We are ISO 13485: 2016 certified for the design and manufacture of medical devices, which confirms that we follow stringent requirements for planning, management, resourcing, production, and quality control procedures.