Vacuum Pumps

Verified by Mel Sykes, Industrial Supply Chain Specialist - April 2026

Specification	Details
Types	Rotary vane, diaphragm, scroll, liquid ring, turbo molecular
Ultimate vacuum	Rough (1 mbar), medium (0.001 mbar), high (<0.001 mbar)
Brands	Busch, Edwards, Becker, Leybold

What are Vacuum Pumps?

Vacuum pumps are devices that remove gas molecules from a sealed container to create a partial vacuum inside it. They're important in manufacturing and research for processes requiring low pressure or high vacuums.

Types and Variants

There are several types of vacuum pumps, each suited to different applications based on their design and performance characteristics:

• Rotary Vane: These operate by rotating vanes within a rotor that moves eccentrically inside the pump casing. They can achieve rough vacuum levels up to 1 mbar with dimensions ranging from 200mm x 250mm to 600mm x 800mm, depending on capacity.
• Diaphragm: Diaphragm pumps use a flexing diaphragm instead of vanes. They're compact and can handle gases contaminated with liquids or solids, making them ideal for rough vacuum applications (up to 1 mbar). Typical dimensions range from 200mm x 300mm to 450mm x 600mm.
• Scroll: Scroll pumps use two spiral-shaped scrolls that compress gas in a circular motion. They can achieve medium vacuum levels down to about 0.001 mbar and are typically compact, measuring around 200mm x 300mm.
• Liquid Ring: Liquid ring pumps use an internal rotating impeller with guide vanes submerged in water or another liquid. They're commonly used for rough and medium vacuum applications (up to about 0.5 mbar) and can handle condensable vapours, gases containing liquids, and solids. Dimensions vary widely but usually range from 300mm x 400mm to 700mm x 900mm.
• Turbo Molecular: Turbo molecular pumps are high-speed impeller devices that achieve ultra-high vacuum levels below 0.001 mbar. They're compact yet powerful, with dimensions typically around 250mm x 350mm.

Materials and Specifications

Vacuum pump components are often made from materials that resist corrosion and wear. Common grades include A2-70 stainless steel for the rotor in rotary vane pumps and EN8 carbon steel for the housing of diaphragm pumps. These ensure durability under harsh conditions like high temperatures (up to 65°C) or corrosive environments.

Standards such as ISO 21360-1, BS EN 12041, and DIN 28479 provide guidelines for testing and performance requirements. For instance, ISO 21360-1 details the minimum operational requirements for vacuum pumps used in semiconductor manufacturing processes.

Selection Criteria

Choosing the right vacuum pump involves several considerations:

• Vacuum Level: Determine if you need rough (up to 1 mbar), medium (down to 0.001 mbar), or high (<0.001 mbar) vacuum levels based on your application.
• Flow Rate and Capacity: Consider the volume of gas needing removal per minute, which impacts pump dimensions and power requirements.
• Compatibility with Media: Ensure compatibility with the gases or vapours involved in your process to prevent damage or contamination.

UK Suppliers

MLC lists verified suppliers from Companies House that offer a range of vacuum pumps. These include brands like Busch, Edwards, Becker, and Leybold. For instance, MLC's supplier list shows companies such as Leybold Holdings Ltd., which offers a wide range of industrial vacuum solutions for various applications.

Common Applications

Vacuum pumps are critical in many industries:

• Semiconductor Manufacturing: Used to create ultra-high vacuums (below 0.001 mbar) for processes like deposition and etching.
• Medical Devices: important for creating strong suction during surgical procedures or for testing and manufacturing medical equipment that requires airtight seals.
• Vacuum Packaging: Ensures food products remain fresh by removing air from packaging to prevent spoilage.
• Waste Management: Used in vacuum systems to transport waste materials through pipelines, reducing odour emissions and improving hygiene.