Adjustable Check Valve for Variable Cracking Pressure
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Solution Overview
Problem
Existing check valves in downhole oil and gas applications have a fixed cracking pressure, limiting their adaptability to different operational parameters, as they can only allow fluid flow at a single pressure, preventing adjustable operation.
Innovation Solution
An adjustable check valve design featuring a housing with a sleeve and springs that can be tensioned by a set screw to adjust the cracking pressure, ensuring fluid flows only in the downhole direction by using a ball and seat mechanism to block uphole flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed cracking pressure check valve is used, then the valve structure is simple, but the adaptability to different operational parameters is limited
Solution Approach 1:
The check valve incorporates an adjustable mechanism that allows the cracking pressure to be dynamically changed based on operational requirements. The set screw can be positioned at different locations on the valve body, and the spring tension can be adjusted, transforming a static valve into a dynamic one that adapts to varying pressure conditions.
Solution Approach 2:
The invention enables changing the cracking pressure parameter by adjusting the spring tension and set screw position. This allows the same valve hardware to operate at different pressure thresholds, effectively changing the functional parameter without replacing the entire valve.
2Adaptability or versatility
If an adjustable mechanism is added to change cracking pressure, then adaptability improves, but device complexity increases
Solution Approach 1:
The set screw serves multiple functions: it acts as both a sealing element and an adjustment mechanism for the spring tension. This multi-functionality reduces the need for separate adjustment components, minimizing the increase in device complexity while achieving adaptability.
Solution Approach 2:
The valve design allows field adjustment of the cracking pressure without requiring special tools or complex procedures. The set screw can be manually positioned and the spring tension adjusted directly, enabling the valve to self-adapt to different operational parameters through simple user intervention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the operator to set a desired cracking pressure, allowing the check valve to function effectively across various operational conditions by adjusting the tension on the springs, thereby accommodating different operational parameters.
Implementation Method 1
a first spring disposed in a lower spring chamber that engages the sleeve to force the first ball into a first seat
Implementation Method 2
a set screw threadably engaged with the housing to apply a desired amount of tension to the first spring
Data Source
AI summary
An adjustable check valve that can include a housing with an inlet and an outlet and a sleeve slidably disposed in the housing, the sleeve having a ball holder portion with a first ball disposed therein. The adjustable check valve can also include a first spring disposed in a lower spring chamber that engages the sleeve to force the first ball into a first seat to prevent fluid from flowing uphole in the adjustable check valve and a set screw threadably engaged with the housing to apply a desired amount of tension to the first spring. A method of designing an adjustable check valve to have a desired crack pressure. The method includes the step of determining a desired crack pressure of the adjustable check valve based on operational parameters. The method also includes the step of assembling the adjustable check valve to have the desired crack pressure.