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Float-Valve Pressure Control for Porous-Plate Apparatus¹

ABSTRACT

A new type of pressure-control regulator is described. The performance of this regulator is compared with the mercury tower regulator and with a two-stage diaphragm regulator. The mercury tower and float-valve regulators were both sufficiently precise for use with porous-plate apparatus. The mercury tower was found to be quite inconvenient to use, requiring more experience than either of the other regulators. The float-valve regulator was found to be easy to use with very little experience but was neither simple nor economical to construct. It was found that the two-stage diaphragm regulator was not a precise pressure control below about 0.4 atni. However, because it is compact and inexpensive, the two-stage diaphragm regulator appears to be quite useful where precision is not required.

¹ Contribution from the Dept. of Soils, Univ. of Wisconsin, Madison, Wisc. Published with the permission of the Director of the Wisconsin Agr. Exp. Sta. This work was supported in part by a grant from the Wisconsin Alumni Research Foundation. Appreciation is expressed to the Dept. of Physics for facilities used to construct apparatus.

² Assistant in soils; associate professor, Biometry and Physics Section; and assistant professor of soils, respectively.

Received for publication March 11, 1953.