Flow Control Valve Sealing With Pressure-Activated Elastomer Seals
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Solution Overview
Problem
Conventional flow control valves face issues with costly metal springs and clamps, corrosion, high operating torque, and premature failure due to reliance on interference fits and high compressive loads, which increase the cost and complexity of assembly and maintenance.
Innovation Solution
A flow control valve design utilizing elastomeric seals with internal and external faces that rely on differential fluid pressure and mechanical resiliency to form a seal, eliminating the need for metal components and interference fits, and incorporating convolutions to expand or contract and maintain a tight seal without high operating torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal springs and clamps are used to maintain seal contact, then sealing reliability is improved, but manufacturing cost increases and assembly complexity increases
Solution Approach 1:
The patent removes metal springs and clamps from the sealing system, retaining only the essential elastomeric seal element. The biasing function previously performed by separate metal components is now integrated into the elastomeric seal itself through its inherent elasticity and convolution design, eliminating unnecessary components and simplifying assembly.
Solution Approach 2:
The elastomeric seal is designed to automatically maintain sealing contact through its own elastic properties and convolution structure. The seal self-biases against the mating surfaces without requiring external metal springs or clamps, and automatically compensates for wear and dimensional variations through its resilient material properties.
2Reliability
If metal springs and clamps are used to maintain seal contact, then sealing reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive metal springs and clamps with a more economical elastomeric seal design. The elastomeric material is inherently cheaper than metal components, and the simplified construction reduces manufacturing costs while maintaining adequate service life for the sealing function.
Solution Approach 2:
The patent changes the material parameter from metal to elastomer, fundamentally altering the cost structure. Elastomeric materials are generally less expensive than metals, and the material's inherent elasticity eliminates the need for additional metal biasing components, reducing overall manufacturing cost.
3Reliability
If o-rings rely on interference fit to prevent leakage, then sealing is achieved, but high compressive loads cause seal failure and require sophisticated assembly equipment
Solution Approach 1:
The patent transitions from a static interference fit system to a dynamic elastomeric seal system. The elastomeric seal can dynamically adapt to pressure changes, wear, and dimensional variations through its elastic deformation, maintaining sealing effectiveness without requiring high static compressive loads that cause failure.
Solution Approach 2:
The patent changes the sealing mechanism from mechanical interference fit to elastomeric deformation. This parameter change allows the seal to function under lower compressive loads by utilizing the material's elastic properties rather than relying on rigid geometric interference, thereby improving durability.
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 provides leak-proof sealing, reduces operating torque, and lowers costs by using elastomeric seals that expand or contract based on pressure differentials, minimizing wear and eliminating the need for complex assembly and costly metal parts.
Implementation Method 1
The pressing against the outer surface of the flow direction block and the inner surface of the housing depends, at least in part, on a differential fluid pressure that acts on internal and external surfaces of the seal
Implementation Method 2
The seal includes an internal face that presses against an outer surface of the flow direction block to form a seal, and an external face that presses against an inner surface of the housing to form a seal
Data Source
AI summary
A flow control valve includes a housing forming internal passages in fluid communication with a port of the valve, and an internal cavity. A flow direction block is disposed in the internal cavity and forms at least one flow passage extending through a portion thereof. The flow direction block is moveable within the internal cavity such that the free ends of the least one flow passage can be selectively aligned with a respective internal passage along an interface as the flow direction block is moved from a first, closed position to a second, open position. A seal is disposed around each interface and includes an internal face, which presses against an outer surface of the flow direction block, and an external face, which presses against the housing. Sealing function is improved, at least in part, by a differential fluid pressure that acts on the seal.