Variable Rate Pressure Regulator Linkage
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Solution Overview
Problem
Diaphragm type regulator valves face challenges in maintaining consistent pressure and flow rate in response to varying downstream demands, as existing designs often rely on fixed mechanical linkages that do not adapt effectively to changes in pressure, leading to inefficiencies and potential pressure imbalances.
Innovation Solution
A pressure regulator valve design featuring a diaphragm with a mobile stem and a four-link linkage system that mechanically couples the diaphragm stem to the valve stem, allowing for variable separation between the valve seat and closure member, enabling adaptive adjustment of flow capacity in response to pressure changes in the downstream region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed mechanical linkages are used to couple the diaphragm stem to the valve stem, then the structure is simple and easy to manufacture, but the pressure control is inconsistent and flow rate cannot adapt to varying downstream demands
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed mechanical linkage into a variable-rate linkage system where the mechanical advantage ratio changes dynamically based on diaphragm position. The linkage includes a diaphragm link, valve stem link, and connecting links with pivots that allow the mechanical advantage to vary as the diaphragm moves, enabling adaptive pressure control while maintaining reasonable structural complexity
Solution Approach 2:
The patent implements parameter changes by designing the linkage geometry such that the mechanical advantage parameter (ratio of diaphragm movement to valve disc movement) changes continuously with diaphragm position. This is achieved through the specific arrangement of links and pivots where the connection angles vary with position, allowing the system to provide different control characteristics at different operating points
2Productivity
If constant mechanical advantage linkage is used, then the mechanical structure is simple, but the flow rate cannot vary in response to pressure changes
Solution Approach 1:
The variable-rate linkage mechanism dynamically adjusts the mechanical advantage based on diaphragm position, enabling the valve to modulate flow rate in response to downstream pressure changes. The linkage geometry ensures that small diaphragm movements at certain positions produce appropriate valve disc movements to maintain stable pressure while allowing variable flow rates
3Measurement precision
If L-shaped levers with constant ratio are used, then the manufacturing is easy, but the pressure regulation precision deteriorates under varying flow conditions
Solution Approach 1:
The patent changes the mechanical advantage parameter as a function of diaphragm position through the variable-rate linkage geometry. This allows the system to provide enhanced pressure regulation precision under varying flow conditions by adjusting the control ratio dynamically, while the linkage components remain manufacturable using standard machining processes
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
The solution ensures stable pressure within a set range and varying flow rates, maintaining outlet pressure within 10% of the set point across different flow conditions, enhancing mechanical reliability and control by dynamically adjusting the mechanical advantage of the linkage system.
Implementation Method 1
mobile portions of the diaphragm responding to changes of pressure in the downstream region by changing position relative to the housing
Implementation Method 2
a spring biasing the diaphragm against resistance provided by pressure in a chamber
Data Source
AI summary
A pressure regulator valve including a valve seat separating a fluid flowpath into an upstream region and a downstream region. A valve closure member is mounted on a valve stem, the valve stem operable to vary a separation between the valve seat and the valve closure member. A diaphragm is mounted in a housing, mobile portions of the diaphragm responding to changes of pressure in the downstream region by changing position relative to the housing. A diaphragm stem is attached to the diaphragm such that movement of the mobile portions of the diaphragm causes movement of the diaphragm stem. A linkage mechanically couples the diaphragm stem to the valve stem. The linkage includes four connected links, the links attached to each other at connection points. The linkage having a mechanical advantage which varies as the positions of the diaphragm stem and valve stem change.