Wellpoint with adjustable valve

Details Wellpoint with adjustable valve Wellpoint with adjustable valve

1974-11-05

1976-01-06

Leppink, James A.

Wells

Screen with valve, closure, changeable restrictor or portion...

E03B 318, E21B 4302

Patent

active

039305384

ABSTRACT:
A wellpoint having an outer screen pipe, and an inner intake pipe connected to a vacuum source. A positionable valve is mounted between the screen pipe and the intake pipe to regulate the amount of screen pipe surface subject to vacuum by the intake pipe.

REFERENCES:
patent: 2359717 (1944-10-01), Myers
patent: 2780293 (1957-02-01), Zandmer
patent: 2891623 (1959-06-01), Boss

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