Bellows Pumps

What is a bellows pump?

A bellows pump is a type of positive displacement pump that uses a bellows device to pump fluid through a piping system. A bellows is basically a type of compressible container with an outlet nozzle. They have been tradtionally used to pump air in applications such as iron smelting and welding, but the same type of device has more recently been used to create high-powered pumps.

How do they work?

A bellows is essentially a chamber that can be expanded or contracted by an external force. Some of these pumps are electric or fuel powered, while simpler types are powered by hand. On one side of the chamber is a valve that allows fluid in but not out. When the chamber is expanded, fluid is drawn in through the valve, and when the chamber is contracted, fluid is forced out through the nozzle.

Where are they used?

They are capable of delivering moderate amounts of water at high discharge pressures, and they have the added advantage of being easily coupled with metering pump mechanisms. They're similar to other types of positive displacement pumps that can be used to create a steady and pulsating flow, and in many cases they can actually outperform devices like piston pumps and diaphragm pumps. The controlled rate of flow and pressure makes them perfect in medical applications and any other uses where the fluid delivery needs to be highly controlled.

Other related Pump Types include: high pressure pumps, pressure pumps, hydraulic pump, water pumps.

Expert Advice

Though gear pumps may seem simple enough, properly sizing them can be complicated. Author suggests that it actually takes five pump curves to correctly size a gear pump.

Learn how following the simple rule of NPSH Available > NPSH Required, can help you avoid cavitation.

Centrifugal pumps can sometimes be noisy, perform poorly, break shafts, and cause other problems. This is often due to one of many pump suction conditions.

Read All

Industry Updates

Switch to: Expert Advice | Pump Tweets

Colfax Fluid Handling has created an online energy savings calculator for oil and gas industry pump applications, World Pumps reports. The calculator allows comparisons between centrifugal pumps and rotary positive displacement pumps in single and multiple pump applications.

Frost & Sullivan recently recognized German pump manufacturer NETZSCH with is 2011 Global Award for Customer Value Enhancement. The company earned the accolades for its customer focus and dedication to innovation, according to the Frost & Sullivan news release.

Pump manufacturer Best PumpWorks recently announced its acquisition of the Shreveport, Louisana-based American Pump Technology, Inc.

Read All

Pump Tweets

Karl Buscher is now the Senior Vice President of Pump Solutions Group (PSG) Commercial. A company press release states that Buscher will report to PSG President Dean Douglas.

KSB has purchased a majority stake in the Danish pump manufacturer Smedegaard. Smedegaard produces circulating pumps used in heating systems.

Colfax introduces an online energy savings calculator for oil and gas industry pump applications. The calculator allows head-to-head comparisons between centrifugal pumps and rotary positive displacement pumps in both single and multiple pump applications. Check it out at the Colfax website.

Read All