Fire Suppression Valve Face Sealing for Stable Pressure Release
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Solution Overview
Problem
Fire suppression systems using pressurized extinguishant gases face challenges with O-ring deformation and pressure control issues, leading to reduced accuracy and potential failure, especially when dealing with liquefied gases that expand upon phase change, causing unpredictable pressure increases.
Innovation Solution
A control valve design featuring a two-part piston arrangement with face seals that move between sealed, restricted, and open positions, allowing precise control of pressure communication between high and low pressure chambers, and incorporating a sintered filter to manage liquefied gas expansion, thereby preventing sudden pressure surges and maintaining system accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If O-rings are used for sealing in pressurized valve systems, then sealing effectiveness is improved, but O-ring deformation under pressure increases the force required to move valve parts and may cause jamming
Solution Approach 1:
The patent changes the sealing mechanism from elastic O-rings to rigid face seals with precise geometric surfaces. The sealing parameter shifts from elastic deformation-based sealing to surface-to-surface contact sealing, eliminating the deformation issue while maintaining sealing effectiveness under pressure.
Solution Approach 2:
The patent extracts and removes the O-ring sealing elements from the valve system, replacing them with face seals integrated into the valve body and moving parts. This eliminates the harmful elastic deformation characteristic of O-rings while preserving the sealing function.
2Productivity
If compressed gas in liquid phase passes through a valve to a region of lower pressure, then gas release is achieved, but phase change expansion causes lag and unpredictable pressure increases
Solution Approach 1:
The patent incorporates a sintered filter that pre-regulates the flow of liquefied gas before it enters the expansion zone. This preliminary flow control prevents sudden uncontrolled expansion and pressure surges, allowing smoother phase transition and more predictable pressure management.
Solution Approach 2:
The patent uses a sintered filter made of porous material to control the flow of liquefied gas. The porous structure provides gradual flow restriction that manages the phase change process, preventing abrupt expansion and enabling more precise pressure control during gas release.
3Stability of the object's composition
If a valve is equipped with a replenishment mechanism to maintain pressure in detection tubing, then pressure stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the replenishment function with the main valve body by integrating a replenishment orifice directly into the valve structure. This combines the pressure control and replenishment functions into a single integrated component, maintaining pressure stability while minimizing additional complexity.
Solution Approach 2:
The patent implements a self-regulating replenishment mechanism where the valve automatically maintains pressure in the detection tubing through the integrated replenishment orifice. The system self-adjusts based on pressure differential without requiring external control systems, maintaining stability while keeping the structure simple.
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 valve ensures precise control of extinguishant release, prevents pressure surges, and maintains system functionality by using face seals and a sintered filter to manage pressure and phase changes, ensuring reliable operation and effective extinguishant distribution.
Implementation Method 1
The pressure in the low pressure reservoir determines whether communication is opened between the inlet and outlet ports
Implementation Method 2
When liquefied gas changes phase upon entering a region of lower pressure, it expands considerably
Implementation Method 3
incorporating a sintered filter to manage liquefied gas expansion
Data Source
AI summary
A valve comprises a housing having a main inlet, a detection port and an outlet, each providing a channel extending from an exterior of the valve into a hollow interior defined in part by the housing. The inlet is arranged, in use, to be in fluid communication with the interior of a pressurised cylinder of extinguishant fluid. The detection port is arranged, in use, to be in fluid communication with a fire detection system. The valve has two valve parts which are relatively movable between a first position, a second position and a third position. In the first position, a face seal prevents communication between the high pressure chamber and the low pressure chamber, in the second position, the face seal is in an unsealed position and allows communication between the high pressure chamber and the low pressure chamber, and in the third position, the face seal prevents communication between the high pressure chamber and the low pressure chamber.