Check valve

• US 4,034,780 A
• Filed: 07/29/1976
• Issued: 07/12/1977
• Est. Priority Date: 01/26/1976
• Status: Expired due to Term

• Current Assignee: Aquology Corporation
• Original Assignee: Aquology Corporation
• Inventors: Horvath, Tibor
• Primary Examiner(s): Cohan, Alan
• Assistant Examiner(s): Michalsky, Gerald A.
• Application Number:
  US05/709,807
• Time in Patent Office: 348 Days
• Field of Search: 137/151, 137/527, 137/527.2, 137/527.4, 137/527.6, 137/527.8, 137/146
• US Class Current: 137/527.8
• CPC Class Codes: F16K 15/03 with a hinged closure member or with a pivoted closure member
• CPC Class Codes: Y10T 137/287 Plunge or immersion starting
• CPC Class Codes: Y10T 137/2911 With valve or closure in-flow passage
• CPC Class Codes: Y10T 137/7898 Pivoted valves
• CPC Class Codes: Y10T 137/7903 Weight biased

Abstract

A check valve for use in a tube has a closure element hinged in the tube which nests within one side of the tube in the open position and pivots to substantially block the tube in the closed position. The closure element has a bottom edge and an upward extending edge which intersect at 90 degrees at the diameter of the closure element, the edges meeting the side of the closure element at points disposed one above the other a distance apart greater than the diameter of the tube. A tubular seat with upper surfaces conforming to the edges of the closure element in the closed position may be inserted below it as a press fit in the tube and the closure element may be hinged to the seat.

Claims

1. A check valve for use in a tube, said check valve comprising, in combination, a closure element formed as a portion of a cylindrical wall to nest within said tube, said closure element having a bottom edge and an upward extending edge, said edges being in planes intersecting at 90°

at substantially the diameter of the cylindrical wall, said bottom edge extending to the side of said cylindrical wall to a first point, said upward extending edge extending to the side of said cylindrical wall to a second point above said first point, said second point being a greater distance from said first point than 1.41 times the inside diameter of said tube, a projection of said closure at said second point contacting said tube preventing the complete opening of said closure element, a tubular seat fixed in said tube having upwardly facing surfaces contacting the edges of said closure in the closed position, and a downward extension of said closure element from said first point, said extension having an enlarged end, said seat on its outersurface containing an opening with an enlarged lower portion and a smaller upper entrance, said enlarged end of said extension extending into said opening and interlocking therewith forming a hinge connection, said surface of said seat conforming to the bottom edge of said closure element extending in front of said opening, said bottom edge of said closure element extending in front of said extension making unbroken contact with said seat in the closed position, so that said closure element nests against said tube in an open position and is swung by downward flow to a closed position completely blocking said tube.