Triple-Offset Valve Structure for Unobstructed High-Coefficient Flow
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Solution Overview
Problem
Conventional valves experience a pressure drop and reduced flow coefficient due to the obstruction caused by the disc and shaft in the flow path, even when fully open, limiting their maximum achievable flow capacity.
Innovation Solution
A triple-offset valve design with a stem configuration that does not project into the flow passageways, allowing the disc to rotate within an interior chamber and move into a belly pocket when open, ensuring an unobstructed flow path and utilizing a removable seat ring with a locator for precise positioning and easy replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a disc and shaft are positioned in the flow path to enable valve operation, then the valve can be operated between open and closed positions, but the obstruction to flow causes pressure drop and reduces the maximum achievable flow coefficient
Solution Approach 1:
The shaft is extracted from the flow path by positioning it in a plane perpendicular to the flow direction, removing the source of obstruction while preserving the valve's operational capability through the disc's rotation mechanism
Solution Approach 2:
The shaft is repositioned from a conventional axial alignment to a perpendicular orientation relative to the flow path, utilizing a different spatial dimension to eliminate flow obstruction while maintaining rotational control functionality
2Ease of operation
If a disc and shaft are positioned in the flow path to enable valve operation, then the valve can be operated between open and closed positions, but the presence of components in the flow path reduces the flow coefficient
Solution Approach 1:
The shaft is extracted from the flow path by positioning it in a plane perpendicular to the flow direction, removing the source of obstruction while preserving the valve's operational capability through the disc's rotation mechanism
Solution Approach 2:
The shaft is repositioned from a conventional axial alignment to a perpendicular orientation relative to the flow path, utilizing a different spatial dimension to eliminate flow obstruction while maintaining rotational control functionality
3Ease of operation
If the stem projects into the flow passageway to support the disc, then the disc can be rotated for valve operation, but the stem creates obstruction and reduces flow capacity
Solution Approach 1:
The stem is extracted from the flow passageway by positioning it in a perpendicular plane, eliminating the obstruction while maintaining disc rotation capability through alternative support mechanisms
Solution Approach 2:
The stem is repositioned from an axial projection into the flow path to a perpendicular orientation outside the flow passageway, using spatial reconfiguration to eliminate obstruction while preserving rotational support function
Data Source
AI summary
A valve comprising a valve body including a first end and a second end spaced apart along a longitudinal axis, a central portion disposed between the first end and the second end, wherein the first end and the second end define a first flow passageway and a second flow passageway, respectively, and wherein the central portion defines an interior chamber, wherein the first end of the valve body includes a bore, a valve seat disposed in the bore including a concave seating surface, and a disc rotatable within the interior chamber between an open position and a closed position, wherein the disc includes a seal 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 of the valve.