US 12,291,940 B2
Float valve apparatus having metal-to-metal seals and method for using same
Robert J. Lejeune, Lafayette, LA (US)
Assigned to B.L. SALES & MANAGEMENT, INC., Lafayette, LA (US)
Filed by B.L. SALES & MANAGEMENT, INC., Lafayette, LA (US)
Filed on Apr. 30, 2024, as Appl. No. 18/650,826.
Claims priority of provisional application 63/518,612, filed on Aug. 10, 2023.
Prior Publication US 2025/0052130 A1, Feb. 13, 2025
Int. Cl. E21B 34/08 (2006.01); E21B 21/10 (2006.01); F16K 31/20 (2006.01)
CPC E21B 34/08 (2013.01) [E21B 21/10 (2013.01); F16K 31/20 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A float valve assembly comprising:
a) a first float valve comprising:
i) a housing defining an inner space, a flow port, a seat and internal threads;
ii) a dart member comprising a dart shaft and a dart head;
iii) a spring configured to bias said dart head against said seat and close said flow port, wherein said dart head at least partially unseats and said flow port at least partially opens when a predetermined fluid pressure acts on said dart head and opposes said bias force applied by said spring;
iv) a baffle strainer member comprising first and second external threads, wherein said first external threads are configured to mate with said internal threads of said housing, and wherein said baffle strainer member is configured to filter out solid materials from passing through said flow port;
b) a tubular sub member configured to be conveyed into a wellbore in a tubular string, wherein said tubular sub member further comprises a central through bore and internal connection threads, and wherein said internal connection threads engage in mating relationship with said threads of said float valve to form a fluid pressure seal.