Reducing Valve Assembly With Balanced Pressure Drop for Cavitation Control
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Solution Overview
Problem
Existing valve assemblies in high-pressure fluid transfer systems are prone to cavitation, leading to rapid erosion and noise issues due to uneven pressure drop distribution, especially at small valve openings, which reduces their service life and complicates manufacturing and assembly.
Innovation Solution
A valve assembly design with a first energy dissipating means featuring elongated apertures with a smaller lower part and a larger upper part, and a second energy dissipating means with perpendicular slots, ensuring a balanced pressure drop distribution across both stages, reducing cavitation risk and simplifying manufacturing and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard regulation valve is used to handle large pressure differences, then the valve can regulate fluid flow, but cavitation occurs causing rapid erosion and noise
Solution Approach 1:
The valve body is divided into multiple chambers (first chamber, second chamber, third chamber) with separate energy dissipation zones. The first energy dissipating means with elongated apertures and the second energy dissipating means with slots create staged pressure reduction, preventing cavitation in any single location and protecting the valve from erosion while maintaining regulatory function
Solution Approach 2:
The first energy dissipating means acts as an intermediary between the high-pressure inlet and the downstream components. By introducing this intermediate energy dissipation stage with elongated apertures, the patent prevents direct cavitation damage to the valve housing while the second energy dissipating means provides additional protection downstream
2Ease of operation
If the valve opening is reduced to small openings for flow control, then flow regulation is achieved, but pressure drop distribution becomes uneven causing cavitation at the second stage
Solution Approach 1:
The first energy dissipating means features elongated apertures with varying cross-sections (smaller lower part, larger upper part) that create different local flow characteristics. This local variation in aperture geometry ensures proper pressure drop distribution even when the valve is nearly closed, preventing cavitation at the second energy dissipating means while maintaining flow control capability
3Reliability
If complex slot geometries are used to direct fluid flow, then cavitation protection is improved, but manufacturing and assembly complexity increases
Solution Approach 1:
The elongated apertures of the first energy dissipating means have an asymmetric geometry with a smaller lower part and a larger upper part. This asymmetric design optimizes fluid flow and pressure drop distribution to prevent cavitation, while still being manufacturable using standard machining processes, balancing performance with ease of manufacture
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 achieves a 50-70% pressure drop at the first energy dissipating stage even at small openings, significantly reducing cavitation at the second stage, thereby extending the valve assembly's lifespan and simplifying the manufacturing and assembly processes.
Implementation Method 1
a first energy dissipating means with a plurality of apertures for reducing the pressure of a fluid from a first pressure to a second lower pressure
Implementation Method 2
a second energy dissipating means with a plurality of apertures for reducing the fluid pressure from the second pressure to a third pressure lower than the second pressure
Implementation Method 3
When this happens, water can vaporize and small gas bubbles may build up. The rise in pressure or the contact with a surface then leads to an implosion of these bubbles, which is a highly energetic phenomenon in terms of pressure and temperature
Data Source
Figure 1a
Figure 1b
Figure 2a
AI summary
The invention relates to a valve assembly (1), in particular reducing valve assembly, comprising a first energy dissipating means (13) and a second energy dissipating means (15) and a valve closing means (17) for opening and closing the valve wherein the geometry of the plurality of apertures (29) of the first energy dissipating means and the geometry of the plurality of the apertures (37) of the second energy dissipating means is such that independently of the opening state of the valve assembly, the pressure drops at the first and second energy dissipating means are better balanced to be able to reduce the effect of cavitation on the housing of the valve assembly.