Alignment Tube Valve Assembly for Precise Seat-Plunger Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fluid control valves face challenges in reliable assembly to the required degree of accuracy, with misalignment between components affecting performance reliability and predictability, particularly in valves without a compliant material at the sealing interface.
Innovation Solution
A valve assembly design featuring an alignment tube that supports both the valve seat and plunger, ensuring precise alignment and easy assembly, utilizing a metal or alloy alignment tube with a deep-drawn microstructure, and incorporating a damping system with spring elements to accommodate misalignment and prevent wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional valve assembly methods are used, then assembly can be completed with standard procedures, but alignment precision between valve seat and plunger deteriorates leading to reliability issues
Solution Approach 1:
An alignment tube is introduced as an intermediary component between the valve seat and plunger. The alignment tube features a bore that receives both components and includes guide features (such as tapered surfaces or precision-machined cylindrical sections) that actively guide and align the plunger with the valve seat during assembly, ensuring precise alignment without requiring complex external fixtures or procedures.
Solution Approach 2:
The alignment tube is pre-configured with guide features before assembly occurs. These guide features (tapered surfaces, precision bore sections, or alignment pins) are built into the tube structure in advance to automatically establish correct alignment between components as they are inserted, eliminating the need for post-assembly alignment adjustments or complex positioning procedures.
2Adaptability or versatility
If multiple separate components are used for valve assembly, then flexibility and adjustability are improved, but assembly complexity and difficulty increase
Solution Approach 1:
The alignment tube merges multiple functions into a single component: it serves as both a structural support element and an active alignment device. By combining the bore (for component reception) with integrated guide features, the design reduces the number of separate alignment fixtures, pins, or adjustment mechanisms needed, thereby simplifying assembly while maintaining dimensional adjustability through the tube's inherent design flexibility.
3Reliability
If alignment tolerances are tightened to improve performance, then valve reliability improves, but assembly difficulty and quality control requirements increase
Solution Approach 1:
The alignment tube acts as a mediator that absorbs and compensates for tolerance variations in the valve seat and plunger components. The guide features within the tube (such as tapered sections or precision-bored cylindrical guides) actively constrain and align components during assembly, ensuring that even if individual components have standard tolerances, the final assembled alignment precision meets high-performance requirements without requiring tight control on each component.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention provides a valve assembly comprising a fluid inlet (10) and a fluid outlet (20); an alignment tube having a bore, a valve seat (40) disposed in the bore of the alignment tube; a fluid pathway passing from the fluid inlet to the fluid outlet via the valve seat. The valve assembly also comprises a moveable plunger (60) having a first and a second end. The moveable plunger is disposed at least partially within the bore of the alignment tube, and has a sealing portion at its first end. The plunger is moveable between a first position and a second position to vary a flow restriction created by the valve seat and the sealing portion. The valve seat is supported by the bore of the alignment tube, and the plunger is supported by the alignment tube at a portion of the plunger distal from its first end, such that the alignment tube aligns the sealing portion of the plunger to the valve seat.