Pneumatic Valve Unit Control for Lower Compressed Air Use
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Solution Overview
Problem
Conventional pneumatically controlled valve units consume a large amount of compressed air, leading to inefficient energy usage due to pressure buildup and release during valve operation.
Innovation Solution
A pneumatically controlled valve unit with a position sensor and control unit that regulates the aeration and ventilation valves based on piston position, reducing compressed air consumption by limiting pressure to below system pressure levels and optimizing pressure chamber conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the aeration valve supplies compressed air to open the main valve until system pressure is reached, then the main valve opens reliably, but a large amount of compressed air is consumed
Solution Approach 1:
The control unit receives feedback from the position sensor about the piston position and uses this information to control the aeration valve. When the piston reaches the fully open position, the position sensor signals the control unit to close the aeration valve, preventing further compressed air intake and thus reducing energy consumption while ensuring reliable valve opening.
Solution Approach 2:
Instead of supplying compressed air until system pressure is reached (excessive action), the control unit supplies compressed air only until the piston reaches the fully open position (partial action). This is achieved by monitoring piston position and closing the aeration valve at the appropriate moment, thereby avoiding unnecessary compressed air consumption.
2Reliability
If the ventilation valve releases compressed air to close the main valve until ambient pressure is reached, then the main valve closes reliably, but compressed air consumption increases for the next opening cycle
Solution Approach 1:
The control unit uses feedback from the position sensor to determine when the piston has reached the fully closed position. At this point, it closes the ventilation valve, preventing complete pressure release. This ensures reliable valve closing while maintaining residual pressure that reduces the energy needed for the next opening cycle.
Solution Approach 2:
Instead of completely releasing the compressed air (discarding all energy), the system recovers some of the pressure energy by maintaining residual pressure in the pressure chamber. The ventilation valve is closed before complete pressure equalization, so the remaining pressure is recovered and reused in the next opening cycle, reducing overall energy consumption.
3Loss of energy
If a position sensor and control unit are added to regulate compressed air supply, then energy efficiency improves, but device complexity increases
Solution Approach 1:
The patent replaces the conventional purely mechanical pressure-regulated control system with an electromechanical system. The position sensor (electrical/optical component) and control unit (electronic component) substitute for complex mechanical pressure regulation mechanisms, achieving more precise and energy-efficient control while reducing mechanical complexity.
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 enables energy-efficient operation by minimizing compressed air usage, allowing for precise control and reduced energy expenditure in valve unit operation.
Implementation Method 1
a position sensor which is set up to detect the position of the piston in the valve chamber
Implementation Method 2
A pressure sensor may be arranged in the valve chamber
Implementation Method 3
The aeration valve supplies a valve chamber with compressed air to open a valve to be switched, as a result of which the pressure in the valve chamber increases
Implementation Method 4
The ventilation valve is opened to close the valve to be switched, such that compressed air can escape from the valve chamber and the pressure in the valve chamber drops to ambient pressure
Data Source
AI summary
A pneumatically controlled valve unit is specified, having a main valve for controlling a fluid flow of a fluid to be dosed. The valve unit has a piston shiftably mounted in a valve chamber, operating against a return device, and connected to a valve closing body of the main valve to open and close the main valve. The piston delimits a pressure chamber within the valve chamber such that the piston can be shifted against the return device by pressurizing the pressure chamber, wherein a position sensor is provided which is set up to detect the position of the piston in the valve chamber. One respective pressure line leads from the pressure chamber to a pressure fluid port and a ventilation port, wherein an aeration valve is arranged in one pressure line and a ventilation valve is arranged in the further pressure line, and wherein a control unit is provided which is set up to switch the aeration valve and the ventilation valve on the basis of the position of the piston detected by the position sensor to regulate a pressure in the pressure chamber for shifting the piston. Furthermore, a valve system comprising at least one valve unit, and a method of operating the valve unit are specified.