Multi-way Valve Elastic Slide Hydrodynamic Centering
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Solution Overview
Problem
Multi-way valves with hard-sealing concepts face issues due to manufacturing-related shape errors and tilting of the valve slide, leading to friction, wear, and reduced positioning accuracy, as radial gaps form wedge-shaped cross-sections that impair functionality and service life.
Innovation Solution
The valve slide is designed to be elastically flexible, allowing the bearing section to align with the control chamber via fluid pressure, forming an annular fluid bearing gap that reduces friction and wear by creating a hydrodynamic bearing effect, which centers the bearing section radially and maintains a continuous fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If narrow radial gaps are used between valve slide and control chamber wall to achieve hard-sealing, then sealing performance is improved, but friction and clamping forces increase due to manufacturing errors and tilting
Solution Approach 1:
The patent introduces a hydrodynamic bearing concept where pressurized fluid flows through the radial gap between the bearing section and control chamber wall, creating a fluid pressure field that supports and centers the valve slide. This hydraulic bearing effect replaces direct metal-to-metal contact, eliminating friction and clamping forces while maintaining the narrow gap required for hard-sealing performance.
Solution Approach 2:
The patent changes the functional state of the radial gap from a static clearance to a dynamic fluid-bearing gap. By introducing pressurized fluid and utilizing the resulting hydrodynamic pressure, the gap transitions from causing friction to providing fluid support, thereby resolving the contradiction between sealing requirements and friction reduction.
2Manufacturing precision
If manufacturing tolerances are tightened to eliminate shape errors, then valve slide alignment is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent implements a self-centering mechanism where the hydrodynamic fluid pressure automatically compensates for manufacturing tolerances and shape errors. The pressurized fluid creates asymmetric pressure distribution that pushes the valve slide into proper alignment, eliminating the need for tight manufacturing tolerances and complex adjustment procedures.
Solution Approach 2:
The patent converts the harmful effect of manufacturing errors and misalignment into a beneficial self-centering effect. The asymmetric gap caused by manufacturing tolerances creates asymmetric fluid pressure that automatically centers the valve slide, transforming what was previously a problem into a solution.
3Reliability
If wedge-shaped gaps form due to valve slide tilting, then sealing contact is improved, but jamming and wear increase
Solution Approach 1:
The patent replaces direct mechanical contact in wedge-shaped gaps with hydrodynamic fluid support. Pressurized fluid flows through the gaps, creating fluid pressure that maintains sealing contact while preventing metal-to-metal jamming and wear. The fluid acts as a lubricant and bearing medium simultaneously.
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 solution achieves pressure-centering, friction-reducing, and wear-reducing effects, enabling precise and low-friction operation of multi-way valves, particularly in hard-sealing designs, by utilizing radial pressurization and the elastic flexibility of the valve slide to form a continuous fluid bearing gap.
Implementation Method 1
the valve slide is designed to be at least partially elastically bendable
Implementation Method 2
forming an annular fluid bearing gap through which the pressure fluid fed in flows in an axially continuous manner in order to align the bearing section with respect to the control chamber in a centric manner
Implementation Method 3
an axially continuous annular fluid bearing gap through which the pressure fluid fed in flows in order to align the bearing section with respect to the control chamber in a centric manner
Data Source
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AI summary
The invention relates to a multi-way valve, which comprises a valve spool (16) disposed in a control chamber (5). On at least one end region, the valve spool (16) has a bearing section (27, 28) which can cover a feed opening (13a, 13b). Because the valve spool (16) is designed to be elastically flexible at least in some regions, a pressure fluid flowing in through the feed opening (13A, 13B) can exert a radial fluid force on the bearing section (27, 28) in order to orient same centrally with respect to the control chamber (5). In this way, low-friction and precise actuation of the valve spool (16) can be ensured, regardless of manufacturing inaccuracies.