Multi-way Valve Stepped Bore Press-fit Guiding
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Solution Overview
Problem
Existing directional multi-way valves require additional machining and precise alignment of guiding bores, making them complex and costly to construct, and may fail due to pneumatic short-circuiting during slow switching operations.
Innovation Solution
A 3/2-way valve design featuring a housing with a stepped bore and shoulder ring, eliminating the need for guiding bores in cover parts through press-fit guiding members and sealing members, and incorporating an outer and inner annular collar for enhanced operational safety against pneumatic short-circuiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If guiding bores are provided in cover parts, then the control piston can be guided, but additional machining operations and precise alignment are required
Solution Approach 1:
The guiding function is extracted from the cover parts and transferred to separate guiding members that are pressed onto the piston rod. This eliminates the need for machining guiding bores in the cover parts and ensures accurate alignment through the press-fit connection.
Solution Approach 2:
The guiding function is segmented into separate guiding members rather than being integrated into the cover parts. These guiding members can be produced as plastic parts without mechanical machining, simplifying the overall construction.
2Reliability
If sealing members are mounted by press fit on the piston rod, then additional sealing is achieved, but assembly complexity increases
Solution Approach 1:
The guiding members and sealing members are combined into a single integrated component that is pressed onto the piston rod as one unit. This merging of functions reduces the number of separate parts and simplifies the assembly process while maintaining both guiding and sealing functions.
3Reliability
If the valve is designed to prevent pneumatic short-circuiting, then operational safety is improved, but the structure becomes more complex
Solution Approach 1:
The outer and inner annular collars are positioned in advance to prevent pneumatic short-circuiting between the sealing members. The collars create a mechanical barrier that blocks potential leakage paths, ensuring operational safety even during slow switching operations.
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 simplifies the construction process by eliminating additional machining and ensures operational safety by preventing pneumatic short-circuiting through pressure differential forces, even with inadequate spring force or pressure.
Implementation Method 1
The guiding members for guiding the control piston in the bore are pressed by means of a press fit onto the piston rod at both ends of the piston rod
Implementation Method 2
one sealing member each rests against one of the sealing shoulders for the purpose of sealing off a first outer transverse bore from a central transverse bore
Implementation Method 3
The control piston is provided in the form of a unilaterally acting control piston which operates against a helical pressure spring acting as a return spring
Implementation Method 4
by use of a pre-control valve, can optionally be loaded with control pressure or ventilated. The control pressure preferably corresponds to the operating pressure which is controlled by the multi-way valve
Data Source
AI summary
A multi-way valve has a housing with a stepped bore forming two piston guiding regions and a shoulder ring with two sealing shoulders. The housing also has a first, second and central transverse bores which are spaced along the cylindrical bore. A contact piston has a piston rod and sealing members secured thereon. The guide members are pressed fit onto opposite ends of the piston rod.