Valve Spool Two-Duct Layout for Low-Loss Pressure Regulation
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Solution Overview
Problem
The existing valve devices experience high pressure losses and instabilities in fluid control due to narrowly dimensioned fluid ducts, leading to inefficient pressure regulation and increased production costs.
Innovation Solution
A two-duct solution is introduced, where one fluid duct is permanently connected to the pressure port, reducing pressure losses and improving regulation quality, while maintaining a simpler and more cost-effective design by using shorter fluid paths and tapered duct cross-sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fluid duct with narrowly dimensioned free duct cross-sections is used, then the device complexity is reduced, but pressure losses increase and fluid control stability deteriorates
Solution Approach 1:
The single fluid duct is segmented into two separate fluid ducts: a first fluid duct for controlling the valve spool and a second fluid duct for transmitting pressure directly to the media chamber. This segmentation allows each duct to be optimized for its specific function, with the second duct providing a direct, short pressure path that minimizes pressure losses while the first duct maintains control functionality.
Solution Approach 2:
The solution transitions from a one-dimensional control path (single duct) to a two-dimensional fluid distribution system (two parallel ducts). The second duct creates a new dimension for direct pressure transmission, bypassing the control mechanisms and delivering pressure directly to the media chamber, thereby reducing pressure losses without complicating the control dimension.
2Device complexity
If a single fluid duct with narrowly dimensioned free duct cross-sections is used, then the device complexity is reduced, but fluid control stability deteriorates
Solution Approach 1:
By segmenting the fluid control system into two separate ducts, the patent isolates the pressure transmission function from the control function. The second duct provides a stable, direct pressure path that is not affected by control movements or narrow cross-section restrictions, thereby stabilizing the fluid control system overall.
Solution Approach 2:
The second fluid duct acts as an intermediary element that directly connects the pressure port to the media chamber, bypassing the valve spool control mechanisms. This intermediary path ensures stable pressure transmission independent of control fluctuations, improving overall fluid control stability.
3Loss of energy
If the fluid duct is permanently connected to the pressure port with shorter fluid paths, then pressure losses are reduced, but the device complexity increases
Solution Approach 1:
The duct system is segmented into two functional ducts, allowing the second duct to be optimized purely for short, direct pressure transmission with minimal path length, while the first duct handles control functions. This segmentation enables the pressure-optimized duct to be simple in design despite adding another component.
Solution Approach 2:
The second fluid duct merges the functions of pressure transmission and control actuation into a coordinated system. By combining the direct pressure path with the control mechanism through proper fluid chamber connections, the system achieves efficient pressure transmission without proportionally increasing complexity.
4Device complexity
If narrowly dimensioned free duct cross-sections are used, then the device complexity is reduced, but regulation quality deteriorates
Solution Approach 1:
By segmenting the duct system, the second duct can be designed with larger, simpler cross-sections optimized for pressure transmission rather than control precision. This allows the regulation quality to improve through the direct pressure path while the first duct maintains the necessary control precision, avoiding the need for complex narrow ducts throughout the entire system.
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 two-duct solution enhances energy balance and stability in fluid control, preventing pressure losses and reducing manufacturing costs, thereby improving regulation quality and actuation geometries.
Implementation Method 1
One end of the first duct opens in at least one of the open positions of the valve spool into the other media chamber. The other end of the first duct in each travel position of the valve spool is connected permanently to the pressure port.
Implementation Method 2
The valve device blocks the connection between the supply and the pressure port in at least one closed position which opens that connection in at least one of its open positions
Implementation Method 3
using shorter fluid paths and tapered duct cross-sections
Data Source
AI summary
A valve apparatus for influencing a flow of medium between a supply port (38) and a pressure port (40) has a valve device (10). In one closed position, the valve device blocks the connection between the supply port (38) and the pressure port (40). The valve device opens this connection in one opened position, in which the pressure port (40) is connected to at least one of two medium chambers (62, 80) by a respective fluid channel (64, 82). One fluid chamber (64) comprises a fluid duct (68) in the valve slider (22). The other fluid channel (82) has a further fluid duct (84) that is separate from the fluid duct (68). In one of the opened positions of the valve slider (22), the further fluid duct (84) opens at one end (92) into the medium chamber (80). In every displacement position of the valve slider (22), the further fluid duct (84) is permanently connected at the other end (94) to the pressure port (40).