Rotary Valve Stem Metering to Reduce Wear and Hysteresis
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Solution Overview
Problem
Conventional fluid flow control valves in combustion and non-combustion applications are complex, leading to wear and increased hysteresis, which results in inaccurate and unreliable fluid flow control over time and multiple cycles.
Innovation Solution
A bi-directional fluid flow metering valve with a simplified design featuring a valve stem and valve body configuration that includes a canal with planar opposing walls, allowing for precise modulation of fluid flow through rotational positioning, reducing wear and hysteresis by varying fluid flow based on the valve stem's orientation within the valve body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional valve designs with multiple moving parts are used, then the valve can achieve fluid flow control, but the valve experiences wear and drift over time leading to increased hysteresis and reduced reliability
Solution Approach 1:
The valve is divided into distinct functional segments: a valve body with a bore, a valve stem with a stem bore, and a valve plug. This segmentation allows each component to perform its specific function with minimal moving parts, reducing wear while maintaining control capability.
Solution Approach 2:
The invention extracts and eliminates unnecessary moving parts from conventional valve designs. By using a simple rotational mechanism where the valve stem rotates within the valve body to position the valve plug, the design removes complex actuation mechanisms while retaining effective fluid flow control.
2Measurement precision
If conventional valve designs with multiple moving parts are used, then the valve can achieve fluid flow control, but hysteresis increases over time reducing flow control accuracy
Solution Approach 1:
The valve employs a dynamic rotational mechanism where the valve stem can rotate to different angular positions to precisely control fluid flow. This dynamic positioning system allows accurate flow modulation without the mechanical play and hysteresis associated with multi-component conventional valves.
Solution Approach 2:
The valve stem and valve plug are combined into an integrated assembly that rotates as a unit within the valve body. This merging of components eliminates relative movement between separate parts, reducing mechanical hysteresis and improving flow control accuracy over time.
Data Source
AI summary
A valve stem for use in a fluid flow control valve having a valve body configured to receive a portion of the valve stem and to enable the valve stem to selectively rotate within the valve body between a fully-open position, where fluid is permitted to flow through the fluid flow control valve, and a fully-closed position, where fluid is prevented from flowing through the fluid flow control valve. The valve stem includes an elongate valve stem arm having a first end and a second end and a valve stem head integrally formed with and fixedly attached to the second end of the valve stem arm. The valve stem head includes a fluid inlet formed in the valve stem head, and a fluid outlet formed in the valve stem head, and a fluid passage that directs fluid from the fluid inlet, through the valve stem, and out of the fluid outlet.