Flexible Sealing Elements in Pneumatic Directional Control Valves
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Solution Overview
Problem
Directional control valves for pneumatic circuits in commercial vehicles are prone to failure due to high operating pressures, leading to rapid wear of sealing components and the need for frequent replacements.
Innovation Solution
A directional control valve design featuring a slide with flexible sealing elements that are compressed by passage elements, allowing for gentle material operation and reduced maintenance, with oval openings and spaced passage elements to facilitate smooth air flow and minimize friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional directional control valves are used with rigid sealing rings, then the valve can maintain structural simplicity, but the sealing rings wear out quickly due to high operating pressures and friction
Solution Approach 1:
The patent applies flexible sealing elements made of elastomeric materials instead of rigid sealing rings. These flexible elements can deform to accommodate surface irregularities and maintain sealing contact under high pressure, significantly reducing wear and extending service life while maintaining manufacturing feasibility
Solution Approach 2:
The patent changes the material parameter of the sealing elements from rigid to flexible, allowing them to adapt their shape and maintain effective sealing contact under varying pressure conditions. This material parameter change enables the sealing elements to withstand high operating pressures without rapid wear
2Reliability
If the slide moves directly against rigid surfaces, then the valve structure remains simple, but friction and material wear increase significantly
Solution Approach 1:
The flexible sealing elements on the slide allow for smooth movement against the valve body surfaces. The elastomeric material reduces friction through elastic deformation and conformal contact, minimizing wear on both the slide and valve body while maintaining structural simplicity
Solution Approach 2:
The patent utilizes pneumatic pressure to assist in the movement of the slide. Compressed air pressure helps overcome static friction and enables smooth transition between valve positions, reducing mechanical wear while maintaining a relatively simple valve structure
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 extends the lifespan of directional control valves by reducing wear on sealing elements, minimizing maintenance needs, and ensuring efficient air flow management under high pressures.
Implementation Method 1
compressed air flowing into the directional control valve can be directed to different connections of the directional control valve as a result of a movement of the spool
Data Source
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AI summary
The invention relates to a directional control valve or a pneumatic circuit, comprising a pressure chamber (61) and a slide (53), the pressure chamber (61) having a pressure space, a first connection (41) and at least one second connection (43, 47), in which the slide (53) is arranged in the pressure space such that it can move between a first position and at least one second position, the slide (53) comprises a first flexible sealing element (73) and at least one second flexible sealing element (55), and the first through-flow region and the at least one second through-flow region (65) comprise a plurality of through-flow elements (67) arranged at a distance from each other.