Valve Sleeve Tapered Surface Reduces Pressure Drop
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Solution Overview
Problem
Hydraulic valves experience inefficiencies due to significant pressure drops and flow forces that oppose actuation, leading to reduced performance and power loss, as fluid flows around a poppet, causing turbulence and momentum changes.
Innovation Solution
The design of the valve incorporates a tapered interior peripheral surface on the sleeve and a poppet with a conical or sharp-edge configuration to minimize pressure drop and flow forces by gradually changing fluid flow direction and area, reducing turbulence and momentum changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If fluid flows around the poppet in a conventional valve configuration, then the valve can control flow direction, but significant pressure drop and flow forces occur that reduce efficiency and oppose actuation
Solution Approach 1:
The patent applies curvature by replacing the conventional sharp-edge seat with a tapered seat having a specific angle (α). This curved/tapered geometry gradually guides the fluid flow around the poppet, reducing turbulence and minimizing pressure drop while maintaining effective flow control. The tapered surface creates a smooth transition for the fluid, eliminating sudden directional changes that cause energy loss.
Solution Approach 2:
The patent changes the geometric parameters of the seat, specifically introducing a tapered angle (α) rather than using a sharp edge. This parameter modification alters the flow characteristics, reducing the pressure drop and flow forces while maintaining the valve's ability to control fluid direction effectively.
2Ease of operation
If fluid flows around the poppet, then flow control is achieved, but flow forces oppose the actuation force causing operational issues
Solution Approach 1:
The tapered seat geometry with angle (α) creates a curved flow path that reduces the sudden impact of fluid on the poppet. This gradual guidance of fluid flow minimizes the reactive forces opposing actuation, making the valve easier to operate and reducing the required actuation force.
Solution Approach 2:
By modifying the seat geometry parameters (introducing the taper angle), the patent reduces the magnitude of flow forces acting on the poppet during actuation, directly improving ease of operation while maintaining flow control functionality.
3Ease of manufacture
If a sharp-edge seat is used for the poppet, then manufacturing is simple, but turbulence and momentum changes increase causing pressure drop
Solution Approach 1:
The patent replaces the sharp-edge seat with a tapered seat having a specific angle (α). This curved/tapered geometry reduces turbulence and momentum changes in the fluid flow, minimizing pressure drop. While slightly more complex than a sharp edge, the tapered seat can still be manufactured using standard machining processes.
Solution Approach 2:
The patent changes the geometric parameters of the seat from a sharp edge (zero radius) to a tapered surface with a defined angle (α). This parameter change reduces flow turbulence and pressure drop while maintaining manufacturability through conventional machining methods.
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
This configuration reduces pressure drop and flow forces, enhancing the valve's efficiency by minimizing power loss and ensuring effective actuation, while maintaining reduced flow resistance and momentum changes.
Implementation Method 1
The design of the valve incorporates a tapered interior peripheral surface on the sleeve and a poppet with a conical or sharp-edge configuration to minimize pressure drop and flow forces by gradually changing fluid flow direction and area, reducing turbulence and momentum changes
Data Source
AI summary
An example valve includes: (i) a housing defining a first longitudinal cavity therein; (ii) a sleeve disposed in the first longitudinal cavity coaxial with the housing, where the sleeve defines (a) a first port at an end of the sleeve, (b) a second port disposed on an exterior peripheral surface of the sleeve, and (c) a second longitudinal cavity therein, where an interior peripheral surface of the sleeve defines a first portion that is tapered at a particular angle and a second portion adjacent to the first portion, where the second portion has two edges forming a corner that defines a seat; and (iii) a poppet mounted within the second longitudinal cavity and configured to move axially therein.