Variable-Wall Plug Valve Sealing for Lower Rotary Torque
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Solution Overview
Problem
Existing rotary valves require higher torque to rotate due to increased friction from sealing elements, limiting the type of rotary actuators that can be used and necessitating costly, high-power actuators. Additionally, they have limited flow configuration capabilities, requiring multiple valve elements to achieve complex fluid routing, increasing cost and complexity.
Innovation Solution
A rotary valve with a rotary component featuring a variable outer circumferential wall radius, incorporating sealing zones and non-sealing zones to reduce radial sealing force and friction, allowing for lower torque requirements and expanded flow configuration capabilities through a five-way switching mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing elements are compressed between the plug and valve body to ensure fluid-tight seal, then sealing effect is improved, but torque required to rotate the plug increases
Solution Approach 1:
The plug incorporates a variable outer circumferential wall radius with sealing zones having larger radius and non-sealing zones having smaller radius. This local variation in geometry allows the plug to provide enhanced sealing at specific locations while reducing overall friction and torque requirements during rotation.
Solution Approach 2:
The variable radius profile of the plug creates dynamic interaction with sealing elements during rotation. As the plug rotates, different radial positions engage with sealing elements, allowing the sealing force to vary cyclically rather than remaining constant, which reduces average friction and torque.
2Adaptability or versatility
If multiple valve elements are used to achieve complex fluid routing, then flow configuration capabilities are improved, but device complexity and cost increase
Solution Approach 1:
The rotary valve is designed as a five-way switching valve with a single rotary component that can route fluid between five different ports. This multi-functional design eliminates the need for multiple separate valve elements, reducing device complexity while maintaining versatile flow configuration capabilities.
Solution Approach 2:
The rotary component is divided into multiple sealing zones and non-sealing zones that can be independently configured. This segmentation allows a single valve element to perform multiple flow routing functions by selectively engaging different zones with corresponding ports during rotation.
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
The solution reduces the torque needed to rotate the valve, enabling the use of a wider range of actuators and simplifying fluid system design by allowing control of multiple flow paths with a single valve, thus reducing costs and complexity while maintaining a fluid-tight seal.
Implementation Method 1
an increase in the sealing effect between the plug and the valve body also tends to increase the amount of torque required to rotate the plug relative to the valve body. This occurs because the amount of compression applied to such a sealing element in a radial direction of the plug valve relates directly to the sealing effect provided thereby. As the degree of compression is increased, a radial force present between an inner surface of the sealing element and the outer surface of the plug also increases. This increased radial force increases the frictional forces present between the sealing element and the outer surface of the plug with respect to a circumferential direction of the plug
Data Source
AI summary
A rotary valve includes a rotary component configured to rotate about an axis of rotation thereof. The rotary component includes a plurality of fluid openings formed at an exterior surface thereof with each of the fluid openings forming a fluid inlet or a fluid outlet into one of a plurality of fluid passageways formed through the rotary component. The rotary component further comprises a valve body rotatably receiving the rotary component therein. The valve body includes a five fluid ports formed therethrough with each of the fluid ports configured to be selectively aligned with one of the fluid openings of the rotary component depending on a rotational position of the rotary component relative to the valve body to allow the rotary valve to operate as a five-way switching valve.