Flapper Valve Sealing Structure for High-Pressure Wear Resistance
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Solution Overview
Problem
Flapper valves with resilient coatings face plastic deformation under high pressures, reducing sealing effectiveness, and pivot pins experience wear from abrasive fluids due to repeated opening and closing.
Innovation Solution
A flapper valve design featuring a rigid core with a stop ring and radially inner and outer resilient coating portions that limit compression, preventing plastic deformation and a sealing mechanism for the pivot pin using resilient rings and ridges to prevent abrasive wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resilient coating is applied to the flapper to enhance sealing ability, then sealing effectiveness is improved, but the coating undergoes plastic deformation under high pressure
Solution Approach 1:
The resilient coating is divided into multiple segments or layers with different material properties. The inner layer has higher compressive strength to resist high pressure, while the outer layer provides sealing compliance. This segmentation allows each layer to perform its specific function without compromising the other.
Solution Approach 2:
The coating is constructed as a composite material system combining resilient polymer matrix with reinforcing fillers or multiple polymer layers. This composite structure provides both the sealing compliance of resilient materials and the compressive strength needed to withstand high operating pressures without plastic deformation.
2Reliability
If the flapper is repeatedly pivoted to prevent backflow, then valve function is maintained, but the pivot pin experiences undue wear from abrasive fluids
Solution Approach 1:
A sealed bearing or pivot mechanism with integrated sealing elements is introduced between the flapper and pivot pin. This intermediary component prevents abrasive fluids from directly contacting the pivot pin while still allowing the flapper to pivot freely for backflow prevention operation.
Solution Approach 2:
A flexible sealing membrane or lip seal is positioned around the pivot pin to create a barrier against abrasive fluids. This flexible seal allows the flapper to pivot while maintaining fluid exclusion, protecting the pivot pin from wear caused by abrasive fluid contact.
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 design maintains effective sealing by preventing plastic deformation of the resilient coating and reduces pivot pin wear, ensuring reliable operation under high pressures and with abrasive fluids.
Implementation Method 1
a resilient coating which is disposed on at least a portion of the core
Implementation Method 2
the stop ring limits the extent to which the radially inner and outer portions are compressed against the valve seat when the flapper is in the closed position
Implementation Method 3
a flapper which is pivotally connected to the retainer
Implementation Method 4
when pressure downstream of the valve increases, the flapper pivots to a closed position under the influence of gravity
Data Source
AI summary
A flapper valve having a valve body which includes first and second ends, a flow bore which extends between the first and second ends, and an enlarged diameter cavity which is formed coaxially within the flow bore; a valve seat which comprises a through bore that is aligned with the flow bore; a retainer which is positioned radially outwardly of the cavity; and a flapper which is pivotally connected to the retainer. The flapper includes a sealing side which is configured to engage the valve seat when the flapper is in a closed position, a core which is made of a rigid material, a circular stop ring which is connected to or formed integrally with the core on the sealing side of the flapper and is configured to engage the valve seat when the flapper is in the closed position, and a resilient coating.