Triple-Offset Valve Layout for Unobstructed High-Cv Flow
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Solution Overview
Problem
Conventional valves with a disc and shaft configuration obstruct the flow path, leading to reduced maximum achievable flow coefficient (Cv), especially in high-pressure systems, due to the presence of the disc and shaft along the valve flow centerline.
Innovation Solution
A triple-offset valve design with a disc that rotates between open and closed positions without obstructing the flow path, featuring a stem supported by the valve body on opposite sides and a seat ring that is easily replaceable, ensuring unobstructed flow passageways and increased flow coefficient (Cv).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a disc and shaft configuration is used to regulate flow, then the valve can be operated between open and closed positions, but the disc and shaft obstruct the flow path causing pressure drop and reduced flow coefficient
Solution Approach 1:
The invention extracts the shaft from the flow path by supporting it on opposite sides of the valve body rather than having it pass through the center. The disc is positioned to rotate without obstructing the flow path, effectively removing the obstructing elements from the critical flow area while maintaining the valve's operational capability.
Solution Approach 2:
The invention changes the spatial arrangement by positioning the stem on opposite sides of the valve body rather than through the center, and by enlarging the interior chamber to accommodate the disc rotation without flow obstruction. This dimensional reconfiguration allows the valve to operate while maintaining an unobstructed flow path.
2Ease of operation
If a disc is positioned in the flow path to regulate flow, then the valve can control media flow rate, but the disc reduces the maximum achievable flow coefficient even when full open
Solution Approach 1:
The invention extracts the disc from the flow path by positioning it to rotate within an enlarged interior chamber. When the valve is fully open, the disc rotates to a position where it does not obstruct the flow path, allowing maximum flow coefficient while maintaining flow regulation capability when partially closed.
3Ease of operation
If a stem passes through the center of the valve to rotate the disc, then the valve can be actuated, but the shaft projects into the flow passageways causing obstruction
Solution Approach 1:
The invention extracts the shaft from the central flow path by supporting it on opposite sides of the valve body. This configuration eliminates the need for the shaft to pass through the center and project into the flow passageways, simplifying the overall device structure while maintaining disc rotation capability.
Data Source
Figure 1A
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Figure 1C
AI summary
A valve (2) comprising a valve body (4) including a first end (8) and a second end (10) spaced apart along a longitudinal axis (12), a central portion (6) disposed between the first end and the second end, wherein the first end and the second end define a first flow passageway (26) and a second flow passageway (28), respectively, and wherein the central portion defines an interior chamber (32), wherein the first end of the valve body includes a bore, a valve seat (46) disposed in the bore including a concave seating surface (136), and a disc (54) rotatable within the interior chamber between an open position and a closed position, wherein the disc includes a seal (52) having a shape corresponding to the concave seating surface and wherein the shape of the seal and the concave seating surface define an elliptical offset from a centerline (90) of the valve.