Poppet Valve Diversion Path Filter for Seal Protection
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Solution Overview
Problem
Conventional poppet valves experience leakage flow across dynamic piston seals, leading to contaminant ingress and premature failure, especially in high-temperature and dusty environments, where existing solutions like rolling glands are not suitable.
Innovation Solution
A poppet valve design incorporating a diversion path with a filter to divert and filter leakage flow before it reaches the dynamic seal, reducing contaminant ingress and maintaining operational performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dynamic piston seal is used to seal the annular clearance, then sealing effectiveness is improved, but contaminant ingress through leakage flow causes premature seal failure
Solution Approach 1:
The leakage flow path is segmented into two sections: a first section through the dynamic seal and a second section through the diversion path. The filter is positioned in the second section to remove contaminants before fluid re-enters the annular clearance, preventing contaminant accumulation at the seal interface while maintaining sealing effectiveness.
Solution Approach 2:
A filter is introduced as an intermediary element in the leakage flow path. The filter captures contaminants suspended in the fluid before the fluid re-enters the annular clearance through the diversion path, preventing direct contact between contaminants and the dynamic seal interface.
2Object-affected harmful factors
If rolling glands are used to eliminate leakage flow, then contaminant ingress is prevented, but high-temperature operation above 240°C becomes impossible
Solution Approach 1:
Different sections of the leakage flow path have different quality requirements. The first section (through the dynamic seal) allows controlled leakage to maintain sealing, while the second section (through the diversion path) is equipped with a filter to remove contaminants. This local differentiation enables both seal protection and high-temperature operation.
Solution Approach 2:
The invention changes the approach from eliminating leakage flow entirely to managing its quality. By introducing a filter in the diversion path, the system transforms the leakage flow from a harmful contaminant-carrying path to a controlled flow that is cleaned before re-entering the annular clearance, enabling operation at temperatures above 240°C where elastomeric rolling glands would fail.
3Object-affected harmful factors
If the diversion path is added with a filter, then contaminant removal from leakage flow is achieved, but device complexity increases
Solution Approach 1:
The diversion path and filter are merged into the existing valve body structure. The diversion path utilizes the existing annular clearance space, and the filter is integrated into this path without requiring separate external filtering systems, thereby reducing overall device complexity while still achieving contaminant removal.
Solution Approach 2:
The diversion path serves multiple functions: it provides a controlled leakage path, houses the filter element, and directs filtered fluid back into the annular clearance. This multi-functionality reduces the need for additional separate components, minimizing the increase in device complexity while achieving effective contaminant removal.
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 filter-containing diversion path effectively filters contaminants from leakage flow, preventing seal failure and extending operational life in harsh environments without restricting fluid flow.
Implementation Method 1
a diversion path formed in the casing diverts fluid for the leakage flow into the annular clearance from the fluid flow in the passage, the diversion path having a filter to filter debris from the diverted fluid
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A poppet valve for regulating a pressure of fluid in a passage is discussed. The valve includes a casing arrangeable such that the fluid in the passage flows over an outer side thereof. The valve further includes a piston axially slidably positionable within the casing, and configured such that the axial position of the piston regulates the fluid pressure in the passage downstream of the poppet valve, an annular clearance being provided between the piston and the casing. The valve further includes a dynamic seal located between the piston and the casing to seal an end of the annular clearance. The valve further includes a piston chamber located on an opposing side of the dynamic seal to the annular clearance such that a leakage flow of the fluid may cross the dynamic seal between the annular clearance and the piston chamber. The pressure of fluid in the piston chamber is usable to vary the axial position of the piston within the casing. A diversion path formed in the casing diverts fluid for the leakage flow into the annular clearance from the fluid flow in the passage, the diversion path having a filter to filter debris from the diverted fluid.