Differential Pressure Control Valve Skirt Chamfer
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Solution Overview
Problem
Existing differential pressure control valves (DPCVs) are large in size and have limitations in precise pressure differential regulation due to significant axial flow forces exerted on the valve member, which complicates maintaining a constant differential pressure in heating or cooling systems.
Innovation Solution
The design incorporates a valve member with a circumferentially extending skirt and a valve seat, where the flow passes radially, minimizing axial flow forces by using a small chamfered transition between the abutment and inner surfaces, allowing for a smaller diaphragm diameter and overall valve size, while maintaining improved differential pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large diameter diaphragm is used to minimize axial flow forces, then pressure differential regulation precision is improved, but valve size increases
Solution Approach 1:
The patent changes the flow direction from axial to radial, moving the problem to a different dimension. By making the flow pass radially between the skirt and valve seat, the axial flow forces are eliminated, allowing for a smaller diaphragm while maintaining regulation precision.
Solution Approach 2:
The patent changes the flow direction parameter from axial to radial, and modifies the geometry parameters of the valve member (skirt with small chamfered transition) to achieve minimal axial flow forces, thereby enabling reduced diaphragm size without sacrificing control precision.
2Measurement precision
If axial flow forces are minimized through design modifications, then differential pressure control is improved, but valve member geometry becomes more complex
Solution Approach 1:
The valve member is segmented into distinct functional surfaces: an abutment surface for axial movement, an inner surface extending axially to face the downstream flow, and an outer surface at an angle. This segmentation allows each surface to perform its specific function while collectively minimizing axial flow forces.
Solution Approach 2:
The patent applies local quality by creating a small chamfered transition (less than 0.1 mm) at the inner corner between the abutment and inner surfaces. This localized geometric feature specifically targets the reduction of axial flow forces without requiring complex modifications throughout the entire valve member.
3Force
If the flow passes radially between the skirt and valve seat, then axial flow forces are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a quantitative parameter for the chamfer transition (less than 0.1 mm extension in both directions), transforming the design requirement into a measurable manufacturing specification. This parameter change enables controlled reduction of axial flow forces with defined manufacturing tolerances.
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 significantly reduces the overall size of the DPCV while achieving enhanced differential pressure control, even with a smaller diaphragm, by minimizing axial flow forces and allowing for adjustable spring force to maintain a constant differential pressure.
Implementation Method 1
the valve member by means of the diaphragm being adapted to set itself in a balance between the upstream pressure on the one hand and the downstream pressure as well as a spring force on the other hand
Implementation Method 2
the spring force being provided by means of a spring member positioned on a side opposite to the valve inlet in relation to the valve member
Implementation Method 3
an inner corner formed between said abutment surface and said inner surface is chamfered or establishes a non-linear transition between the abutment surface and the inner surface, said chamfer or transition extending less than a distance of 0.1 mm from the inner surface in a direction towards the abutment surface and less than a distance of 0.1 mm from the abutment surface in a direction towards the inner surface
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The valve comprises a housing with an upstream inlet, a valve inlet for communicating with a downstream flow, and a valve outlet. A pressure maintaining arrangement comprises a diaphragm and a valve member movable along an axis of the valve, the valve member setting itself in a balance between the upstream pressure on the one hand and the downstream pressure as well as a spring force on the other hand. The valve member comprises a circumferentially extending skirt (9) facing the valve seat (12). The skirt (9) comprises an abutment surface (17) facing an opposing surface (17a). An inner corner formed between said abutment surface (17) and an inner surface (18) of the skirt (9) is chamfered or establishes a non-linear transition (19) between the abutment surface (17) and the inner surface (18), said chamfer or transition (19) extending less than a distance (A) of 0.1 mm from the inner surface (18) in a direction towards the abutment surface (17) and less than a distance (B) of 0.1 mm from the abutment surface (17) in a direction towards the inner surface (18).