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Vacuum is a volume of space that is empty of matter. In the context of laboratory and factory, it is usually a sealed volume with very low gas molecules count, i.e., its gaseous pressure is much less than atmospheric pressure. The first repeatable vacuum created in a laboratory is by Evangelista Torricelli in 1643. He built the first mercury barometer and wrote a convincing argument that the space at the top was a vacuum. Today, a vacuum pump is used to achieve the vacuum status of a sealed container.

Vacuum pumps can be categorized according to the technique used to achieve vacuum:

  • Positive displacement pumps repeatedly expand a cavity to allow gases to flow into the cavity from the sealed chamber. They then seal off the cavity and exhaust it to the atmosphere. Common positive displacement vacuum pumps include Rotary vane pump, Diaphragm pump, Liquid ring pump, Piston pump, Scroll pump, Screw pump, Wankel pump, External vane pump, Roots blower, Multistage Roots pump, Toepler pump, Lobe pump.
  • Momentum transfer pumps (molecular pumps) use high speed jets of dense fluid or high speed rotating blades to knock gas molecules out of the chamber. Common Momentum transfer pumps include Diffusion pump and Turbo-molecular pump
  • Entrapment pumps capture gases in a solid or adsorbed state. Common Entrapment pumps include Ion pump, Cryo-pump, Sorption pump, Non-evaporative getter.
 22 companies matched 
aoke carton box clothing bag shoe paper pattern plotter drawing flat bed cutting machine company
Vacuum Equipment, Environmental Sensors, Weather Sensors, Chromatography Instruments
Beijing Changhang Investment Casting Co.,Ltd.
Investment Castings,Artificial Joints Castings,Impellers,High-temperature alloy castings, 
Bruker AXS Inc.
Vacuum Equipment, Product Material Testing
Carl Zeiss IMT Corporation
Vacuum Equipment
Cascade TEK
Environmental Testing Services,Custom Vacuum Drying Ovens
CeramTec North America
Electrical Electronics Fasteners Hardware, Industrial Heaters Heating Elements, Vacuum Equipment, Ceramics Glass Materials, Temperature Sensors
Cheng Mei Machine Co., Ltd.
01. Thermoforming Machine02. Vacuum Forming Machine03. Pressure Forming Machinery04. Plastic Thermoforming Machine05. Hydraulic Cutting Machine
Chroma ATE, Inc.
Power Supplies Conditioners, Machine Vision Equipment, Vacuum Equipment
Clairton Industrial Tool & Supply, LLC
Normal 0 MicrosoftInternetExplorer4 ,We specialize in tools for commercial and industrial users and excel with requests for tools that are hard to find.  Our focus...
Keithley Instruments, Inc.
Data Acquisition Signal Conditioning, Vacuum Equipment, Calibration Instruments, Stards Reference Sources
LI-DAR Packaging Machinery Works Co., Ltd.
01. Vacuum Forming Machine02. Thermoforming Machine03. Blister Machine04. Plastic Packaging Machine
MKS Instruments, Inc.
Pneumatic Equipment Components, Vacuum Equipment, Flow Sensors, Flowmeters
MTI Instruments Inc.
Vacuum Equipment, Linear Position Sensors
PANalytical, Inc.
Vacuum Equipment, Light Sources, Product Material Testing
Long experience, excellent quality, advanced technology, global assistance, turn-key solutions are just some of the key elements that make TAV vacuum furnaces unique and required all over...
Working across many industry sectors, from vacuum technologies to heat treatments, we have built a reputation for quality. With a special focus on innovation, TAVENGINEERING supplies you with...
Uidea Rapid Prototype China Co., Ltd.
SLA, china rapid prototyping company, vacuum casting, cnc machining prototype, reaction injection molding, plastic extrusion, aluminium extrusion, sheet metal fabrication, rapid tooling, rapid...
ULVAC Technologies, Inc.
Industrial Assembly, Vacuum Equipment
Unitron, Inc.
Inspection Tools Instruments, Vacuum Equipment
Wellgreen Process Solutions
Stainless steel hygienic fittings are the major parts for a hygiene process system. To be one of hygienic solution provider, Wellgreen manufactures and supplies an extensive sanitary pipe...
Zygo Corporation
Vacuum Equipment