Constant head flow unit

Details Constant head flow unit Constant head flow unit

1998-10-26

2000-08-22

Williams, Hezron

Measuring and testing

With fluid pressure

Porosity or permeability

73 73, G01N 1508, G01N 502

Patent

active

061054186

ABSTRACT:
On-site percolation testing apparatus comprising a constant head flow unit disposed within a generally cylindrical, percolation chamber to be positioned within the in-ground test site. The constant head flow unit includes a J-shaped conduit for intermittently delivering water from a predetermined supply of water to the chamber. A first end of the conduit extends up from and out of the chamber in direct communication with the water supply. A second end thereof, disposed within the chamber, includes an automatic shut-off valve to control the flow of water through the conduit into the chamber. Cooperating with the shut-off valve is a floating member positioned to move up and down as the water level changes. As the floating member moves down it contacts the shut-off valve and opens same to release water into the chamber. With the water rising, the floating member moves out of contact with the valve allowing the water pressure of the incoming water to again close the valve. This process will be repeated a number of times during the test. However, by the use of the constant head flow unit hereof, a relatively constant level of water is maintained in the chamber to thereby give the system more reliability.

REFERENCES:
patent: 5269184 (1993-12-01), Nishida

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