Valve Plug Annular Grooves Prevent Sticking and Leakage
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Solution Overview
Problem
Existing valve apparatuses face challenges in maintaining desired seat performance while preventing sticking during valve opening operations, as recesses on the valve seat surface can lead to fluid leakage due to scratches or grooves, compromising the seal when the valve is closed.
Innovation Solution
The valve apparatus features a plurality of annular grooves with different diameters on either the valve plug or valve seat surface, arranged concentrically to reduce contact area and prevent sticking during opening, while ensuring a reliable seal in the closed state by blocking fluid flow through unscratched surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If recesses are provided on the valve seat surface to prevent sticking, then the valve opening operation is improved, but fluid leakage occurs through scratches or grooves between the recesses, degrading seat performance
Solution Approach 1:
The valve seat surface is segmented into multiple concentric annular grooves with different diameters, creating multiple separate sealing zones. This segmentation allows the sealing function to be distributed across multiple independent rings, so that a scratch or groove in one annular groove does not compromise the entire sealing performance.
Solution Approach 2:
Multiple annular grooves are nested concentrically within each other, with each groove having a different diameter. This nested arrangement creates a hierarchical sealing structure where fluid must pass through multiple concentric barriers, and the presence of unscratched portions in any groove maintains the sealing integrity.
2Ease of operation
If the contact area between valve plug and valve seat is reduced to prevent sticking, then the valve opening operation is improved, but the sealing capability is degraded
Solution Approach 1:
The contact area is segmented into multiple concentric annular regions defined by the grooves, rather than a single large contact area. This segmentation reduces the total continuous contact area between the valve plug and seat, minimizing sticking, while each annular segment maintains local sealing capability.
Solution Approach 2:
Different annular regions have different sealing functions, with each groove and the portions between grooves contributing to the overall sealing. The local quality of each annular segment is optimized for sealing, while the collective arrangement reduces overall contact area to prevent sticking.
Data Source
AI summary
In a valve apparatus, an annular contact portion made of elastic material is provided on a valve portion of a valve plug. A plurality of annular grooves are formed on a proximal end surface of a valve seat member which abuts against the contact portion. The annular grooves are formed around a communication hole through which fluid flows. The annular grooves have different diameters, and are concentric with one another.