Bellows Pump

A reliable source for Metering Pump information and leading Metering Pump Companies & Manufacturers.

In many applications this type of pump is preferred even to the more traditional piston metering pump as it offers high reliability and clean operation. Used in aerospace, avionics, medical, pharmaceutical, fuel, chemical, laboratory and research industries, the bellows pump operates in a fairly simple two part process. Read More…

Bellows Pump Bellows pumps are a specific type of metering pump which use accordion like pleated materials to enact the positive displacement of fluids.

Leading Manufacturers

Malvern, PA  |  877-778-3456

We are able to provide chemical metering pumps that our competition cannot match! We began our business operations years ago as a small company and we have grown into a company dedicated to providing our customers with the same service we provided all those years ago. To receive the highest levels of customer service in the industry contact our friendly staff today to get started!

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Jaeco Fluid Systems, Inc. $$$

Burbank, CA  |  800-848-1141

Ryan Herco Flow Solutions is a leading national distributor for fluid handling products. Our family of products include; Flowmeters, sensors, instrumentation tubing and hose, process pipe and fittings, valves, pumps, filters and filter systems, storage and drums, and corrosion resistant structural products. We have 29 U.S. Service Centers ready to serve you.

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Ryan Herco Flow Solutions $$$

Horsham, PA  |  281-578-4200

Inframark offers the PDS™ (Precision Dosing System) as a pre-assembled and pre-wired packaged system designed for efficient and precise chemical injection. The PDS system features corrosion-resistant materials for all wetted components. The proven, accurate design and durable construction of the PDS System ensure low maintenance and dependable operation for the life of the equipment.

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Inframark $$$

Lafayette, LA  |  337-235-9838

Sidewinder manufactures pneumatic and electric metering pumps. With the patented timer and adjustable stroke control, the pneumatic line provides flows to 680 QPD up to 10,000 PSI. The electric line is available in simplex and multiplex design with flows to 60 GPH and pressures to 1,000 PSI.

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Sidewinder Pumps, Inc. $$$

Wilmington, MA  |  800-282-8823

A manufacturer of metering pumps and products such as sealless pumps, dispensing pumps and chemical feed pumps, Watson-Marlow serves a variety of industries. Our benchtop pump reaches such a high level of accuracy it can dispense to within 0.5%; it also can meter out 100ml in 4 seconds.

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Watson-Marlow Fluid Technology Group $$$
placeholder image Jaeco Fluid Systems, Inc. Ryan Herco Flow Solutions Inframark Sidewinder Pumps, Inc. Watson-Marlow Fluid Technology Group

The first part of a bellows pump mechanics are the rotations or oscillations of an attached motor shaft extending the bellows, creating a vacuum effect which draws fluid in from a reservoir. The inlet valve functions only in one direction, as does the outlet valve in order to eliminate contamination or inaccuracy due to backflow. The continued movement of the motor shaft then retracts the bellows, compressing the material and displacing the fluids which are exhausted through the aforementioned outlet valve. A relatively simple process, bellows pumps can be manual or automatic and offer precision fluid metering with clean and quite operation.

Double and triple bellows systems further the possibilities of this particular type of pump as they allow the handling of hazardous, toxic, corrosive and abrasive materials in addition to fluids such as water, oil and medicine. Introducing a precise amount of fluid with each cycle, these metering systems provide a consistent amount of fluid into a continuous flow stream ensuring the homogeneity of the final process stream. With the capacity to operate for over 10,000 continuous hours without particle shedding or other contamination, bellows pumps offer limitless metering possibilities.

The simple operation of the bellows pump is accompanied by a fairly simple design which is often recognizable in medical apparatus which use the pump to carefully and continuously deliver doses to patients intravenously. The bellows themselves act as the pump head, or the compartment into which the intake fluid enters. The drive shaft is attached to one end of the bellows, with the other connected to a stable plate positioned in the flow line. On one side of the stationary end is the intake valve while the outlet is on the opposite.

While the bellows themselves may be made through electroforming, chemical deposition and mechanical forming; welding together stamped contoured diaphragms is the most popular production method for metal bellows while plastics may be stitched, sewn or molded. Common metals include aluminum, stainless steel, copper and titanium. Plastic materials such as laminated polyester, treated synthetic fabric, rubberized fabric and polyvinyl chloride are used as well.

The check valves are made of similar materials as they too must be suited to the composition of the liquid being metered. The motor is the most variable aspect of the bellows pump as it may be electric or fuel based, or altogether lacking as foot or hand pedals may also be used to enact bellow extension and retraction, though not in timed applications. Additional considerations for bellows pumps include operating pressure, flow and temperature ranges as well as stroke, size and efficiency.