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US 3,930,538 AGranted
Wellpoint with adjustable valve
AssigneeGriffin Wellpoint Corporation
InventorsWalter W. Brennan, Charles R. Myers, Paul E. Perry
Life of this patent
Estimating the term…
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.
Claims6
A wellpoint comprising:
- pipe means for the intake of liquid from the well and connection to vacuum producing means;
- screen means spaced apart from and surrounding said pipe means for admitting and maintaining a liquid supply for said pipe means;
- and
- slidably adjustable valve means located between said pipe means and said screen means for adjusting the amount of surface area of said screen pipe subjected to said vacuum.
1 more element
A wellpoint comprising:
- a cylindrical screen pipe having a closed end for insertion into a well, an open end and openings formed intermittently on its length;
- a cylindrical pipe member removably mounted on one end concentrically within said open end of said screen pipe and adapted to be connected with vacuum producing means on its other end;
- an annular valve member slidably mounted on said pipe member and shaped to conform to the space between said screen and pipe member and having first and second chamfered edges abutting said pipe member;
- a first O-ring mounted on said pipe member and against said first edge;
- and
- a second O-ring mounted on said pipe member and against said second edge.
3 more elements
In a wellpoint having an outer screen pipe for admitting and maintaining a supply of liquid and an inner vacuum producing pipe, the improvement comprising:
- slidably adjustable valve means located between the outer screen pipe and the vacuum producing pipe for adjusting the amount of surface of said screen pipe subjected to said vacuum.
Dependencies are inferred from the claim text.