Gas Turbine Drain Valve Assembly Safety Logic
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Solution Overview
Problem
Drain valves in gas turbine engines can inadvertently open due to interrupted air supply, allowing hot gases to enter potentially flammable drain tanks during normal operation, posing a safety risk.
Innovation Solution
A valve assembly with a single actuator connected to multiple drain valves, a solenoid valve, and a safety valve that prevents venting when compressor exit pressure exceeds 1 bar, ensuring the drain valves remain closed by regulating air supply through the solenoid valve and position switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If drain valves are actuated by a supply of compressor air, then the drain valves can be opened for draining, but if the air supply line is interrupted during operation, the drain valves could open inadvertently allowing hot gases to enter flammable drain tanks
Solution Approach 1:
The invention inverts the normal actuation logic by using compressed air not to open the drain valves directly, but to maintain a safety condition. The compressed air acts on a diaphragm to keep a valve closed, and only when the air pressure is removed (intentionally or unintentionally) does the drain valve open. This inversion ensures that inadvertent air supply interruption does not cause unwanted opening.
Solution Approach 2:
The invention introduces an intermediary mechanism (the diaphragm-actuated valve and spring system) between the compressed air supply and the drain valve. This intermediary translates the presence or absence of air pressure into a controlled opening/closing action, providing a buffer that prevents direct and potentially unsafe transmission of air supply status to the drain valve position.
2Adaptability or versatility
If multiple drain valves are controlled by separate actuators, then each valve can be independently controlled, but the system complexity increases
Solution Approach 1:
The invention merges multiple independent actuator functions into a single centralized compressed air supply system. Instead of having separate actuators for each drain valve, all valves are controlled through a common air line that feeds a diaphragm mechanism, simplifying the overall system architecture while maintaining the ability to control multiple valves simultaneously.
Solution Approach 2:
The compressed air supply system is designed to serve multiple functions: it acts as both the control medium for opening/closing drain valves and as a safety mechanism to prevent inadvertent opening. This multi-functional use of the air supply reduces the need for additional dedicated safety systems or actuators.
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
Enhances safety and reliability by maintaining closed drain valves during normal operation, preventing hot gases from entering flammable drain tanks even if the air supply is interrupted, thus improving operability and reducing the risk of accidents.
Implementation Method 1
a solenoid valve comprising an inlet for regulated air that drives the actuator, an actuator inlet/outlet port connected to the actuator and a solenoid exhaust for venting the actuator
Implementation Method 2
The solenoid exhaust port is connected to a safety valve that opens and closes the exhaust path as a function of the pressure at the gas turbine engine compressor exit
Implementation Method 3
The actuator has position switches and simultaneously controls the opening and closing of all drain valves
Data Source
AI summary
A valve assembly is provided for a gas turbine engine with at least two drain valves connected to the gas turbine engine to drain oil and moisture from the engine, an actuator for opening and closing the at least two drain valves, a solenoid valve connected to the actuator and to a regulated air supply for driving the actuator and a safety valve connected to an exhaust of the solenoid valve and to a compressor air supply, the compressor air supply driving the safety valve to prevent the actuator from being vented during engine operation. A method of securely operating a plurality of drain valves is also provided.