Valve Rod Piston Connection Geometry for Durability
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Solution Overview
Problem
Pressure reducing valves experience durability issues due to tilting of the valve rod, leading to uneven wearing and reduced lifespan, as a result of unbalanced loads and axial misalignment with the piston.
Innovation Solution
A pressure reducing valve design where the connection between the valve rod and piston is positioned inwardly of the sliding contact area, at the center of the piston, with additional rings and a seal member aligned at the piston's center of gravity to prevent tilting and misalignment, thus reducing uneven wear and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the valve rod is connected to the piston at a location within the sliding contact area, then the structure is simpler, but tilting occurs causing uneven wear and reduced durability
Solution Approach 1:
The connection location is specifically positioned at the center of the piston in the direction perpendicular to displacement, and inwardly of the sliding contact area. This localized positioning creates a specific geometric relationship that prevents tilting by ensuring balanced load distribution, thereby resolving the contradiction between structural simplicity and durability.
2Reliability
If the connection location is positioned at the center of the piston perpendicular to displacement direction, then tilting is prevented, but the structural design becomes more complex
Solution Approach 1:
The connection location is deliberately positioned asymmetrically relative to the sliding contact area boundaries, specifically at the center of the piston perpendicular to displacement direction. This asymmetric positioning within the symmetric piston structure creates balanced moment arms that prevent tilting, achieving alignment reliability without excessive complexity.
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 effectively prevents tilting and axial misalignment, resulting in reduced wear and increased durability of both the valve rod and piston, with improved sealing and reduced sliding resistance.
Implementation Method 1
a first resilient member for normally resiliently biasing the valve rod toward the valve seat
Implementation Method 2
a second resilient member for normally resiliently biasing the piston toward the valve seat
Implementation Method 3
a sliding contact area, which is held in sliding contact with respect to an inner wall of the body
Data Source
AI summary
In a pressure reducing valve, a valve rod forms one portion of a side wall of a piston, and is connected to the piston inwardly of a sliding contact area, which is held in sliding contact with an inner wall of a body. More specifically, a connection location between the valve rod and the piston is located at the interior of the piston.