Cupped Seat Recessed Surface Regulator Stability
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Solution Overview
Problem
Fail open regulators experience control and stability issues in high pressure situations due to erratic forces acting on the valve plug, leading to high frequency oscillations at high flow rates, especially when there are high inlet pressures and low output pressures.
Innovation Solution
The design incorporates a cupped seat with a recessed surface in the mounting assembly, which reduces the pressure gradient acting on the valve plug by changing the fluid flow path, stabilizing the regulator's output and preventing high frequency oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional flat seat design is used in fail open regulators, then the regulator can operate in high pressure situations, but control and stability problems occur due to erratic forces on the valve plug causing high frequency oscillations at high flow rates
Solution Approach 1:
The patent applies curvature by designing a cupped seat with a recessed curved surface instead of a conventional flat seat. This curved geometry modifies the fluid flow path and pressure distribution across the valve plug, reducing erratic forces and preventing high frequency oscillations during high flow rate operation while maintaining reliability in high pressure situations
2Reliability
If the downstream volume is increased or flow is restricted to minimize erratic forces on the valve plug, then control stability improves, but the corrective measures fail at higher flow rates where negative pressure gradients cause the valve plug to oscillate
Solution Approach 1:
The patent applies local quality by creating a localized recessed cupped geometry at the seat area where fluid pressure acts on the valve plug. This localized structural modification changes the pressure distribution specifically at the critical interface between fluid and valve plug, reducing erratic forces and preventing oscillations without requiring system-wide changes that would limit flow rate
3Adaptability or versatility
If the regulator is designed for high inlet pressure and low output pressure operation, then it can serve critical infrastructure applications, but high frequency oscillations occur at high flow rates due to negative pressure gradients pulling the valve plug toward the seat
Solution Approach 1:
The cupped seat's curved recessed surface is specifically designed to work in high pressure differential applications by modifying the fluid flow path in a way that reduces negative pressure gradients. This allows the regulator to maintain stability in critical infrastructure applications operating at high inlet pressures and low output pressures without experiencing high frequency oscillations
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 pressure regulator maintains stable operation at high flow rates with reduced pressure drop and oscillations, ensuring consistent performance in high pressure and low output pressure environments.
Implementation Method 1
a negative pressure gradient can occur wherein a pressure drop across the valve seat can cause the valve plug to be initially pulled toward the valve seat
Implementation Method 2
the cupped seat having a recessed surface does not experience high frequency oscillations at high flow rates in application with high inlet pressures and low output pressures. The change in the mounting assembly to incorporate the recessed surface correspondingly changes the flow path of the fluid passing through the throat
Data Source
AI summary
A regulator having a valve body defining a flow-path for a fluid and having a valve seat, an actuator casing coupled to the valve body, a control member disposed within the actuator casing and adapted for displacement relative to the valve body and the valve seat for regulating a flow of the fluid through the flow-path by moving between an open position and a closed position wherein the control member engages the valve seat, and a spring operatively coupled to the control member and biasing the control member toward the open position. The control member includes a surface facing the valve seat that is recessed. The recessed surface may be a counter-bore, or may have a convex shape, conical shape, or other appropriate recessed surface. So configured, the regulator displaced improved stability in high inlet pressure, low output pressure, high flow rate implementations.