Pneumatic Inline Valve Controller With Passive Biasing Member Cooling
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Solution Overview
Problem
Existing pneumatic controllers for inline valves in fluid systems, particularly in gas turbine engines, face challenges with hot control fluid affecting valve performance and require active control mechanisms or external cooling, which can be inefficient and unreliable.
Innovation Solution
A pneumatic controller design featuring a manifold with low and high pressure ports, an actuator port, and a vent, where a selector moves between positions to control fluid flow and a biasing member is cooled by low pressure fluid flowing through the vent, enabling passive control without external signals and reducing the impact of hot control fluid on valve performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the air provided to the valve is relatively hot, then the actuator can function with hot control fluid, but the actuator requires cooling and/or periodic service to function reliably
Solution Approach 1:
The controller is divided into separate functional zones: a cooling channel separated from the actuator chamber, allowing hot control fluid to flow through the cooling channel while the actuator operates in a thermally isolated environment. This segmentation enables the actuator to be cooled independently while the control fluid maintains its temperature for proper valve actuation.
Solution Approach 2:
A cooling fluid acts as an intermediary substance, flowing through the cooling channel to absorb heat from the actuator without directly mixing with the hot control fluid. This intermediary cooling fluid transfers thermal energy away from the actuator, maintaining reliable operation temperatures while allowing the control fluid to remain hot for proper valve control.
2Ease of operation
If conventional pneumatic controllers are used, then valve control is achieved, but active control mechanisms are required which reduces system efficiency
Solution Approach 1:
The biasing member is automatically cooled by the control fluid flowing through the cooling channel, eliminating the need for external cooling systems or active temperature control mechanisms. The system serves itself by using the existing control fluid flow to maintain optimal operating temperatures, reducing device complexity while ensuring reliable valve control.
3Temperature
If the actuator is cooled externally, then actuator temperature is controlled, but external cooling systems increase system complexity
Solution Approach 1:
The cooling function is merged with the existing control fluid delivery system. The cooling channel is integrated into the controller body, using the same control fluid that actuates the valve to also cool the actuator. This merging eliminates the need for separate external cooling systems, reducing device complexity while maintaining proper actuator temperature control.
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
This solution provides passive control of inline valves with reduced need for active mechanisms, maintains valve performance by cooling the biasing member, and allows for larger flow areas, minimizing the impact of hot control fluid on valve operation.
Implementation Method 1
The low pressure port is in fluid communication with the vent in both the first position and the second position to cool the biasing member with low pressure fluid received at the low pressure port
Data Source
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AI summary
A pneumatic controller includes a manifold (116), a selector (118), and a biasing member (120). The manifold has a low pressure port (122), a high pressure port (124), an actuator port (126), and a vent (128). The selector (118) is movable within the manifold between a first position and a second position, the low pressure port in fluid communication with the actuator port in the first position, the high pressure port in fluid communication with the actuator port in the second position. The biasing member is supported within the manifold and urges the selector towards the first position, wherein the low pressure port (122) is in fluid communication with the vent (128) in both the first position and the second position to cool the biasing member (120) with low pressure fluid received at the low pressure port. Inline valves, gas turbine engines, and methods of controlling fluid flow through inline valves are also described.