Annular Piston Valve Outlet Turbulators for Noise and Cavitation
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Solution Overview
Problem
Existing needle valves experience noise and cavitation due to jet contraction at the valve outlet, leading to inefficient flow guidance.
Innovation Solution
Incorporation of turbulators at the outlet opening and inner guide part of the housing to swirl the medium, enhancing flow profile and reducing noise generation by generating vortices and facilitating medium deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the housing is designed to achieve a directed and straight flow from the valve inlet to the valve outlet, then the flow guidance is improved, but jet contraction occurs at the valve outlet leading to noise and cavitation
Solution Approach 1:
The patent applies parameter changes by modifying the flow parameters through turbulators. The turbulators change the flow regime from straight and directed to a swirling flow pattern, which alters the velocity distribution and pressure characteristics, thereby preventing jet contraction and reducing noise and cavitation while maintaining effective flow guidance
Solution Approach 2:
The patent converts the potentially harmful straight flow that causes jet contraction into a beneficial swirling flow. The turbulators intentionally create flow separation and vortices that, while seemingly disrupting the straight flow, actually prevent the harmful jet contraction effect at the outlet, transforming a potential problem into a solution
2Loss of energy
If turbulators are arranged at the outlet opening to swirl the medium, then kinetic energy is added to the flow and noise is reduced, but flow separation at the valve seat may be affected
Solution Approach 1:
The patent applies local quality by placing turbulators specifically at the outlet opening area rather than throughout the entire housing. This localized intervention creates swirling flow only where needed to reduce noise and add kinetic energy, while the upstream flow guidance and valve seat sealing areas maintain their original straight flow characteristics necessary for proper sealing
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
Improves flow guidance by reducing noise and cavitation, enhancing flow separation at the valve seat, and adding kinetic energy to the flow.
Implementation Method 1
The turbulators generate vortices that add kinetic energy to the flow and reduce flow separation at the valve seat
Implementation Method 2
Furthermore, the turbulators generate a wake that facilitates the deflection of the medium from the housing to the pipeline
Data Source
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AI summary
The invention relates to a ring piston valve with a housing (1), an annular channel (8) formed between an outer part (3) and an inner guide part (5) of the housing (1) for guiding a medium between an inlet opening (9) and an outlet opening (10) of the housing (1), a closing piston (15) guided axially displaceably within the inner guide part (5) of the housing (1), and an adjusting device actuatable from the outside of the housing (1) by means of a drive shaft, via which adjusting device the closing piston (15) can be axially moved between an open position and a closed position by rotating the drive shaft. According to the invention, turbulators (32, 33) for swirling the medium flowing out through the outlet opening (10) are arranged at the outlet opening (10) of the housing (1).