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Browse Prior Art Database

Pneumatic Diode

IP.com Disclosure Number: IPCOM000096598D
Original Publication Date: 1963-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Truslove, DJ: AUTHOR

Abstract

In the pneumatic diode (upper drawing), housing 10 has a tapered cylindrical cavity 11. The wider end of cavity 11 is generally hemispherical in shape. It is extended to define a meniscus-shaped space 12 between the end wall of cavity 11 and a spherical globule 13 of liquid. This liquid is one, like mercury, having a high surface tension and a low vapor pressure. In such case, housing 10 is made of a material, like glass, which is not wetted by the particular liquid used.

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Pneumatic Diode

In the pneumatic diode (upper drawing), housing 10 has a tapered cylindrical cavity 11. The wider end of cavity 11 is generally hemispherical in shape. It is extended to define a meniscus-shaped space 12 between the end wall of cavity 11 and a spherical globule 13 of liquid. This liquid is one, like mercury, having a high surface tension and a low vapor pressure. In such case, housing 10 is made of a material, like glass, which is not wetted by the particular liquid used.

Due to its surface tension, the liquid normally assumes a substantially spherical shape filling the wider end of cavity 11, as shown, to seal off port 14. Pressure fluid supplied to duct 15 enters 12 and displaces the liquid rightward against the bias provided by its surface tension forces, until 14 is uncovered. Then, pressure fluid flows from 15 via 14 to jumper passage 16 and thence via port 17 to duct 18. The pressure required to hold the globule displaced is relatively small compared to the applied fluid pressure. Hence, the pressure drop across the valve is small. But if pressure fluid is supplied to 18, the globule is forced leftward. This blocks 14 to prevent flow from 18 to 15.

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