Dynamic Piston Sealing Valve for Gas Switching
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Solution Overview
Problem
Existing pressure-relieved valves for gases suffer from seal wear and reduced dynamic switching properties due to high friction and lack of lubrication, leading to decreased tightness and switching frequencies over time, especially when used with pure gases.
Innovation Solution
A valve design featuring a dynamic piston sealing device with increased sealing force in the shut-off position, utilizing radial and axial contact surfaces and an elastic sealing element, which reduces stress on the seal and maintains tightness across multiple switching cycles, and includes a spring element to compensate for tolerances and ensure sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a piston seal is provided to ensure tightness between piston and piston guide, then sealing performance is improved, but friction increases and wear occurs reducing switching frequency
Solution Approach 1:
The patent changes the sealing mechanism from continuous contact sealing to intermittent contact sealing. The elastic sealing element only contacts the piston guide surface when the piston is in the shut-off position, and separates when the piston moves to the open position. This parameter change in contact state reduces cumulative friction and wear while maintaining sealing performance when needed.
Solution Approach 2:
The patent introduces a dynamic sealing mechanism where the sealing element's contact state changes dynamically with piston position. The elastic sealing element deforms to contact the piston guide at shut-off position and relaxes to separate during open position, creating a dynamic sealing system that adapts to operational requirements and reduces wear.
2Reliability
If a tight sealing ring is used to ensure valve tightness, then sealing force increases, but frictional forces increase reducing piston speed
Solution Approach 1:
The patent implements periodic sealing action where the sealing element engages only during the shut-off position and disengages during the open position. This periodic engagement provides necessary sealing force when required while eliminating continuous friction that would reduce piston speed, allowing high-speed switching when tightness is not required.
Solution Approach 2:
The patent applies sealing force locally only at the piston guide interface when the piston is in the shut-off position, rather than applying frictional force along the entire piston stroke. The elastic sealing element concentrates sealing action at the specific location and time when tightness is needed, minimizing overall friction.
3Reliability
If material particles accumulate in the piston seal area, then wear on the seal increases, but this cannot be prevented without compromising sealing
Solution Approach 1:
The patent makes the sealing element skip or separate from the piston guide surface during the open position, avoiding continuous contact that would allow material particles to accumulate and cause wear. The elastic sealing element rapidly engages and disengages, rushing through the sealing action in the shut-off position without prolonged contact that leads to particle accumulation.
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 achieves high tightness and reduced wear, allowing for a large number of switching cycles with improved piston speed and reduced friction, enhancing the valve's dynamic switching properties and extending its operational lifespan.
Implementation Method 1
the piston sealing device can have an elastic sealing element which is inserted into a concentric gap formed between the piston of the piston guide device
Implementation Method 2
If the piston sealing device has a spring element acting in the longitudinal direction of the piston, by means of which a compressive force can be exerted on the sealing element
Implementation Method 3
with friction of the sealing element on the contact surfaces decreasing when the piston moves from the shut-off position to the open position
Data Source
AI summary
The invention relates to a valve (10), in particular for gases, wherein the valve has a valve housing (11) and a movable piston (13) arranged in the valve housing, wherein the piston is movable relative to a valve seat (26) of the valve housing in such a way that two chambers (19, 20) can be shut off from each other, wherein a line (30) is assigned to one chamber, which permanently connects two working spaces (31, 32) of the piston, wherein the working spaces are designed in such a way that the piston is pressure relieved, wherein a piston sealing device (36) for sealing the chambers is formed between the piston and a piston guide device (14), and wherein the piston sealing device is designed as a dynamic piston sealing device, such that in a closed position of the piston a sealing force is greater than in an open position.