Spring-Biased Check Valve Bushing for Chatter-Free Flow
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Solution Overview
Problem
Check valves often experience valve chatter and instability due to balanced forces acting on the valve element, leading to reduced flow capability and increased risk of backflow, as existing designs struggle to maintain a significant opening force over closing force without compromising the full stroke of the valve element.
Innovation Solution
The check valve design incorporates a valve element and a bushing with a tapered flow guide surface, a biasing member, and a valve seat insert, allowing for axial movement and controlled compression to ensure a consistent seal and optimized flow, while the bushing's vent passages manage pressure to prevent seal damage and enhance sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opening force is made measurably greater than the closing force to prevent valve chatter, then valve stability improves, but the full stroke of the valve element is reduced and overall flow capability decreases
Solution Approach 1:
The patent changes the force balance parameters by introducing a biasing member that applies a closing force to the valve element. The biasing force is calibrated to create a specific imbalance where the opening force (upstream fluid pressure) is measurably greater than the closing force (spring bias + backpressure), preventing valve chatter while maintaining adequate flow capability through the full stroke
Solution Approach 2:
The patent uses a valve element design where the head portion geometry is optimized to distribute forces evenly during closure, copying successful designs from similar applications. The conical sealing surface angle and head portion dimensions are replicated from proven configurations that achieve reliable sealing without excessive compression of the valve seat insert
2Reliability
If the valve element compresses the valve seat insert excessively to ensure sealing, then sealing performance improves, but the valve seat insert may be damaged or deformed
Solution Approach 1:
The patent incorporates a biasing member (spring) that pre-compresses the valve element against the valve seat insert by a controlled amount. This beforehand cushioning ensures that the valve element is already engaged with the seat insert before full pressure differential occurs, distributing the sealing load gradually and preventing sudden excessive compression that could damage the valve seat insert
Solution Approach 2:
The patent controls the compression parameter by designing the biasing member with specific stiffness and pre-compression characteristics. The valve seat insert compression is limited to a predetermined fraction of its uncompressed thickness, maintaining sealing performance while preserving the structural integrity of the valve seat insert
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
This design effectively reduces valve chatter, maintains a higher opening force than closing force, and enhances flow efficiency by guiding fluid flow and managing pressure, thereby minimizing backflow and maintaining a reliable seal across varying pressures.
Implementation Method 1
The valve element (e.g., poppet) of a check valve typically has two main forces acting upon it, the closing force that can be generated by a spring, magnet, or gravity and the opening force generated from the upstream fluid
Implementation Method 2
The bushing further comprises a tapered flow guide surface opposite the outboard end surface and angled to substantially match an angled conical surface of the valve element head portion, to guide flow toward the valve element flow passage when the valve element is in the open position
Implementation Method 3
the valve element seals against the valve seat insert to prevent flow between the inlet port and the outlet port
Data Source
AI summary
A check valve includes a valve element and a valve body having a body housing, an annular valve seat insert, a bushing, and a biasing member. The body housing includes an outer circumferential wall extending between an inlet port and an outlet port to define a valve cavity therebetween. The valve seat insert is seated in a body seat surface surrounding the inlet port. The bushing is disposed in the valve cavity and defines a central bore, with the bushing including an outboard end surface axially engageable with the valve seat insert. The biasing member is disposed between a bearing portion of the body housing and an inboard end of the bushing to allow for axial movement of the bushing with respect to the body seat surface. The valve element extends through the bushing central bore and is movable between a closed position and an open position.