Flow Control Valve for Gas Cylinder Filling
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Solution Overview
Problem
Current gas cylinder filling systems require manual adjustment of restrictor valves to control filling rates, leading to inefficiencies and dependence on operator skill, as well as potential underfilling due to rapid expansion and cooling, or prolonged filling times due to slow filling.
Innovation Solution
A flow control valve system that automatically adjusts gas flow rates based on pressure differences between the storage cylinder and the cylinder being filled, using a piston and needle valve mechanism with a feedback sensing port to maintain a constant flow rate without electronic control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual adjustment of restrictor valve is used to control filling rate, then operator can control the filling process, but the system becomes dependent on operator skill and time-consuming
Solution Approach 1:
The system uses a feedback mechanism where the piston automatically adjusts the needle valve position based on the pressure differential between storage cylinder and cylinder being filled. The system serves itself by using the process parameters (pressure difference) to automatically control the flow rate, eliminating the need for continuous manual adjustment and operator intervention.
Solution Approach 2:
The feedback sensing port receives pressurized fluid representative of the cylinder pressure, which acts on the piston to automatically adjust the needle valve. This creates a closed-loop control system where the output (cylinder pressure) feeds back to control the input (gas flow rate), enabling automatic optimization of the filling process without operator skill dependency.
2Extent of automation
If automatic flow control valve with needle valve controlled by storage pressure is used, then filling rate is automatically controlled, but the gas flow rate decreases steadily as cylinder pressure increases
Solution Approach 1:
The system dynamically adjusts the needle valve opening based on the real-time pressure differential between the storage cylinder and the cylinder being filled. As the cylinder pressure increases, the pressure differential decreases, causing the piston to automatically open the needle valve further to maintain constant flow rate, creating a dynamic compensation mechanism that maintains filling uniformity throughout the process.
Solution Approach 2:
The system changes the control parameter from storage pressure alone to the pressure differential between storage cylinder and cylinder being filled. By using the differential pressure to control the piston position and needle valve opening, the system compensates for pressure changes and maintains a constant gas flow rate, achieving uniform filling.
3Productivity
If cylinder is filled too rapidly, then filling efficiency increases, but air heats up and expands causing incomplete filling
Solution Approach 1:
The system applies periodic thermal compensation by controlling the gas flow rate to account for thermal expansion. The feedback mechanism continuously adjusts the flow rate based on pressure differential, which indirectly compensates for temperature effects. By maintaining optimal pressure differential, the system ensures consistent filling that accounts for thermal effects, achieving both efficiency and completeness.
4Reliability
If cylinder is filled too slowly, then thermal expansion issues are avoided, but operator time is wasted
Solution Approach 1:
The system replaces manual mechanical adjustment with an automated pneumatic control mechanism. The piston, driven by pressure differential, automatically positions the needle valve to maintain optimal flow rate. This substitution of manual control with automated feedback-based mechanical control enables the system to operate at optimal speed without thermal expansion issues, achieving both efficiency and accuracy.
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 system ensures efficient and consistent filling of gas cylinders by automatically adjusting the gas flow rate, reducing operator reliance and maintaining a linear flow rate throughout the filling process, thereby improving efficiency and minimizing underfilling.
Implementation Method 1
The position of the piston changes a rate of flow of gas through the flow control valve. The piston position moves in response to a pressure at the feedback sensing port.
Implementation Method 2
The needle valve controls the flow of gas through the aperture.
Data Source
AI summary
A flow control valve includes a housing defining a cavity therein. The housing has an input port for receiving a gas from a gas supply, and an output port for delivering the gas to a gas cylinder. The cavity defines a staging area fluidly connected to the input port, a delivery area fluidly connected to the output port, and a pressurization area fluidly connected to a feedback sensing port. The feedback sensing port is configured to receive pressurized fluid that is pressurized to a pressure level representative of a pressure level of gas delivered to the gas cylinder. The flow control valve includes a piston slidably positioned in a channel extending between the pressurization area and the delivery area. The position of the piston changes a rate of flow of gas through the flow control valve. The piston position moves in response to a pressure at the feedback sensing port.