Inlet Pressure Compensation Valve With Bellows Feedback
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Solution Overview
Problem
Pressure regulating valves in pneumatic systems, particularly in aircraft turbine engine applications, fail to fully compensate for varying fluid pressures, leading to misalignment and leakage, which compromises their reliability and operation within a desired regulation band.
Innovation Solution
A pilot seat/poppet valve system that moves proportionally with inlet pressure, using downstream pressure feedback through bellows to control airflow, ensuring a flat regulation band by adjusting the control poppet and piston assembly to maintain consistent fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pressure regulating valves are used, then basic pressure regulation is achieved, but they fail to fully compensate for varying fluid pressures causing misalignment and leakage
Solution Approach 1:
The patent implements a feedback mechanism where downstream pressure is sensed and fed back to the bellows, which then adjusts the poppet position to compensate for pressure variations. This closed-loop feedback system ensures the valve maintains proper alignment and sealing under varying pressure conditions, resolving the contradiction between reliability and manufacturing precision.
Solution Approach 2:
The bellows mechanism changes the physical state of the valve by expanding or contracting in response to downstream pressure variations. This parameter change (bellows volume/position) directly compensates for pressure fluctuations, maintaining seal integrity and alignment without requiring high manufacturing precision for fixed components.
2Reliability
If belleville washer or similar compensating regulators are used, then pressure compensation is attempted, but misalignment and leakage occur
Solution Approach 1:
The bellows acts as an intermediary element between the downstream pressure and the poppet valve. Instead of directly forcing the poppet against the seat (which causes misalignment), the bellows gradually transmits pressure changes, allowing smooth adjustment that maintains proper alignment and prevents leakage.
Solution Approach 2:
The valve system transitions from a static alignment approach to a dynamic one where the bellows continuously adjusts the poppet position based on real-time downstream pressure. This dynamic adjustment ensures the seal remains intact under varying conditions, eliminating the leakage problem associated with fixed compensating regulators.
3Measurement precision
If complex compensating mechanisms are added to improve pressure regulation, then regulation accuracy improves, but device complexity increases
Solution Approach 1:
The valve system is self-regulating through the bellows mechanism that automatically responds to downstream pressure changes without external control. The downstream pressure itself drives the compensation action through the bellows, eliminating the need for complex external control systems while maintaining a flat regulation band.
Solution Approach 2:
The bellows is nested within the valve body, and the poppet is nested within the bellows structure. This compact nested arrangement achieves sophisticated pressure compensation functionality without increasing overall device complexity, as the compensating mechanism is integrated into the existing valve architecture rather than added as a separate external system.
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 consistent operation within a desired regulation band, reducing wear and costs, and providing reliable, lightweight, and compact pressure regulation, while being self-powered by the system's internal pressure.
Implementation Method 1
downstream pressure feedback through bellows to control airflow
Data Source
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AI summary
An inlet pressure valve regulation system to provide a regulated fluid flow includes a housing, first piston assembly, regulating valve, and inlet pressure conduit. The housing has an inlet at an inlet end which receives a pressurized fluid and an outlet at an outlet end which provides the regulated fluid flow. The piston assembly is arranged in the housing and has a first cavity and a control orifice to fluidly connect the inlet to the first cavity. The first piston assembly is configured to regulate the fluid flow. The regulating valve has a first valve chamber, a second valve chamber fluidly connected to a vent, a floating valve seat disposed between the first valve chamber and the second valve chamber, and a valve component. The floating valve seat includes a diaphragm and a seat having a passageway to fluidly connect the first valve chamber and the second valve chamber.