Resilient Valve Seat Assembly Impact Absorption
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Solution Overview
Problem
Conventional safety relief valves suffer from a short service life due to rapid deterioration of the valve and lapped seating surface caused by mechanical reseating impact and pressure cycling, leading to repeated sealing surface damage.
Innovation Solution
A pressure relief valve design featuring a valve seat assembly with a resilient member and insert member that absorbs impact forces, utilizing a resilient seal ring and a Bellville washer or o-ring to absorb impact and maintain sealing integrity, allowing for multiple valve 'pops' without significant deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a precision valve with lapped seating surface is used, then manufacturing economy is improved, but service life deteriorates due to rapid deterioration from mechanical reseating impact
Solution Approach 1:
A resilient member (such as a spring or elastomeric element) is positioned between the valve member and the lapped seating surface to absorb impact forces before they reach the precision seating surfaces. This cushioning mechanism protects the lapped surfaces from damage during reseating operations, thereby extending service life while maintaining the manufacturing economy of using precision-lapped seats.
Solution Approach 2:
An insert member with a resilient coating or resilient material is introduced as an intermediary between the rigid valve member and the precision lapped seat. This intermediate layer absorbs mechanical impact during valve closure while allowing the precision lapped surfaces to maintain their sealing function, thus resolving the contradiction between manufacturing simplicity and service life durability.
2Device complexity
If conventional valve seating is used, then device simplicity is improved, but reliability deteriorates due to repeated sealing surface damage from pressure cycling
Solution Approach 1:
A resilient member or elastomeric coating is applied to either the valve member or the seating surface, creating a flexible element that can deform during valve operation to absorb impact forces. This flexible component maintains reliable sealing across hundreds of pressure cycles while adding minimal complexity to the overall valve structure.
Solution Approach 2:
The valve seat assembly uses composite construction combining rigid structural components with resilient materials (such as elastomers, polymers, or spring elements). This composite approach provides both the structural integrity needed for simple valve design and the shock-absorbing properties required for reliable sealing under repeated pressure cycling.
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 significantly extends the service life of the relief valve by absorbing impact forces and reducing pressure flutter, enabling hundreds of operational cycles before appreciable sealing deterioration, compared to conventional valves which typically last for five or fewer cycles.
Implementation Method 1
a resilient member that is supported on the inner wall of the seat body. The resilient member resiliently presses against the insert member and is positioned to absorb a portion of the impact force received on the upper end of the insert member supporting upon seating of the valve member
Data Source
AI summary
A valve seat assembly for a pressure relief valve in which a valve member is biased against a valve seat to a closed position and movable away from the valve seat to an open position when inlet fluid pressure reaches a predetermined threshold value, the valve seat assembly having a seat body with an internal bore and positioned to abut the valve member when moved by the spring to the closed position. An insert member is disposed in the seat body to extend between an upper end of the seat body and a resilient member supported by the seat body for resiliently pressing against the insert member, the upper end of the insert member supporting the valve seat to seal with the valve member.