Since 1947, Harwood Engineering Company has been engaged in the development and manufacture of pressure components and systems to contain, generate, pipe, valve, control and measure the flow and pressure at very high pressure levels in liquids and gases.

In 1947, Harwood Engineering Company offered commercial equipment for pressure up to 200,000 psi. In fact, they were the sole suppliers of equipment above 3 Kilobar (45,000 psi) in the United States.

In the intervening years, Harwood has developed the "Controlled Clearance" principle upon which primary standards of pressure above the manometer level, to as high as 30 Kilobar, are used throughout the world. They are currently making primary force standards in a new apparatus using a variant of this same principle.

For over sixty years Hardwood has made equipment for producing pure isostatic pressures to 30 Kilobar (430,000 psi) at room and elevated temperatures. They also make presses up to 10,000 tons for quasihydrostatic pressures so necessary in the manufacture of diamonds and fundamental studies in pure physics, geophysics, and geochemistry.

Hardwood's market is relatively small and does not justify extensive "agency" type of marketing since so much of their effort is to customer specification requiring direct and personal contact with their clients.

Any group seriously considering high pressure activity can find generous recognition of Hardwood's efforts by authors in this field as well as many of their own published articles.

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Technical Articles

A Contemporary Version of the Bridgman-Birch 30 Kilobar Apparatus and Certain Ancillary Devices (.pdf) (Calibration Instruments, Standards and Reference Sources) The paper briefly describes the basic Harwood apparatus, particularly the deviations from the original Bridgman model and the elaboration thereof by Birch for uses with gases at high temperature. (View Full Article)
A Deadweight Piston Manometer for Use up to 2 GPa (.pdf) (Calibration Instruments, Standards and Reference Sources) A dead-weight piston manometer which serves as a standard for accurate measurements of pressures up to 2 GPa is described. (View Full Article)

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Harwood Engineering Company
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