Composite Valve Seal Structure Against O-Ring Displacement
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Solution Overview
Problem
Existing telescopic assemblies face issues with O-ring seals that flutter, make noise, and become displaced due to pressure differentials, leading to fluid leakage and operational failure.
Innovation Solution
A valve seal comprising a stiff component and sealing material is used to provide a fluid seal between the piston body and valve, with a geometric shape and assembly design that maintains the seal's integrity during high-velocity fluid flow, preventing displacement and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an O-ring seal is used to provide fluid seal between valve and piston body, then the seal is simple and effective under normal conditions, but the O-ring becomes displaced and loses sealing capability under high pressure differential and high velocity fluid flow
Solution Approach 1:
The seal is divided into two distinct components: a resilient sealing member (O-ring) and a stiff retention component. The resilient member provides the sealing function while the stiff component provides retention against displacement. This segmentation allows each component to be optimized for its specific function, resolving the contradiction between sealing effectiveness and resistance to pressure differential.
Solution Approach 2:
The seal assembly uses a composite structure combining materials with different properties: a resilient elastomeric material for sealing and a stiff material (such as metal or rigid polymer) for retention. This composite approach allows the seal to simultaneously provide both sealing capability and resistance to high velocity fluid flow and pressure differentials.
2Ease of operation
If the valve opens under pressure differential, then fluid flow control is achieved, but high velocity fluid flow causes suction effect and wash effect that displace the O-ring
Solution Approach 1:
The stiff retention component acts as an intermediary between the O-ring seal and the high velocity fluid flow. It shields the O-ring from the direct impact of the fluid flow, preventing both the suction effect that pulls the O-ring inward and the wash effect that blows the O-ring outward. This intermediary component allows the valve to operate freely while protecting the seal.
Solution Approach 2:
The stiff retention component is pre-installed to counteract the harmful suction and wash effects before they can displace the O-ring. By providing preliminary structural support and positioning, it prevents the O-ring from being subjected to the full force of the pressure differential and high velocity flow during valve operation.
3Device complexity
If the O-ring is pulled out of position by suction effect, then fluid sealing is compromised, but the valve structure remains simple
Solution Approach 1:
The seal function is segmented into two components: the O-ring provides fluid sealing while the stiff retention component prevents displacement. This segmentation maintains relative simplicity while ensuring both sealing integrity and resistance to suction effects that would otherwise compromise the seal.
Solution Approach 2:
The composite structure of resilient sealing material and stiff retention material creates a unified seal assembly that maintains fluid sealing reliability without significantly increasing structural complexity. The two materials work together to provide both sealing and positional stability.
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 valve seal effectively prevents fluid leakage and noise, ensuring reliable operation of telescopic assemblies by maintaining a secure seal despite pressure differentials and high-velocity fluid flows.
Implementation Method 1
This low-pressure zone will create a 'suction effect' attempting to pull the O-ring radially inward
Implementation Method 2
high velocity flow of fluid will impact the 'backside' or 'gland-facing' side of the O-ring and essentially 'wash' or 'blow' the O-ring out of position
Data Source
AI summary
A canned valve seal is disclosed. The valve seal is used within a gland formed in a piston body, the valve seal providing a fluid seal between the body and a valve when the valve is in a closed position, the valve seal includes a stiff component and a sealing material about the stiff component.