US 12,241,347 B2
Robust gas lift valve suitable for use in harsh environments with multiple seals
Daniel Ryan Murski, Victoria, TX (US)
Assigned to Liberty Lift Solutions, LLC, Houston, TX (US)
Filed by Liberty Lift Solutions LLC, Houston, TX (US)
Filed on Sep. 6, 2024, as Appl. No. 18/827,299.
Application 18/827,299 is a continuation of application No. 18/352,098, filed on Jul. 13, 2023.
Claims priority of provisional application 63/483,988, filed on Feb. 9, 2023.
Prior Publication US 2024/0426197 A1, Dec. 26, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 43/12 (2006.01)
CPC E21B 43/123 (2013.01) [Y10T 137/2934 (2015.04)] 19 Claims
OG exemplary drawing
 
1. A gas lift valve comprising:
an assembly comprising a valve seat housing, a bellow housing, a dome housing, an end housing, a plug, and a cap,
wherein the end housing is located at a first end of the gas lift valve and the valve seat housing is located at a second end of the gas lift valve;
wherein the bellow housing is coupled to the valve seat housing;
wherein the dome housing coupled to the bellow housing, and the dome housing at least partially defines an interior charging chamber;
wherein the end housing is coupled to the dome housing and the end housing defines:
a first exterior surface having a first external diameter;
a second exterior surface having a second external diameter, wherein the second external diameter is less than the first external diameter, and wherein at least a portion of the second exterior surface is threaded; and
a plug receiving bore, the plug receiving bore including an internally threaded portion;
wherein the plug is at least partially positioned within the plug receiving bore and the plug includes an exterior surface threadedly coupled to a portion of the internally threaded portion of the plug receiving bore;
wherein the cap defines a cap bore having an interior surface and at least a portion of the internal surface of the cap bore is threaded, and wherein the cap is threadably coupled to the second exterior surface of the end housing; and
a first resilient sealing element positioned between the interior surface of the cap bore and the second exterior surface;
a second resilient sealing element positioned between an outer surface of the plug and an interior surface of the end housing,
a crush washer positioned between the plug and the end housing
a third resilient sealing element positioned between an interior surface of the cap and the second exterior surface of the end housing, wherein the third resilient sealing element is located closer to the bellow housing than the first resilient sealing element; and
wherein:
the second resilient sealing element is positioned along a longitudinal axis of the gas lift valve at a position between the first resilient sealing element and the crush washer; and
the crush washer is positioned along the longitudinal axis of the gas lift valve at a position between the second resilient sealing element and the third resilient sealing element.