Pressure-Equalized Switching Valve for Low-Force Flow Path Actuation
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Solution Overview
Problem
Existing flow path switching valves require a large force to shift the pushrod due to fluid pressure opposing the opening of flow paths, making them inefficient in terms of energy consumption.
Innovation Solution
The valve body is designed with a cylindrical shape, including a valve rod, first and second valve elements, and pressure equalizing paths that connect back pressure chambers to cancel out fluid pressures on the valve elements, reducing the force needed to shift the valve rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pushrod is shifted to open a flow path against fluid pressure, then the flow path is opened, but a large force is required to shift the pushrod
Solution Approach 1:
The patent introduces a pressure equalizing path that connects the first and second back pressure chambers, allowing fluid pressure to act on both sides of the valve elements simultaneously. This creates a counterbalancing effect where the pressure differential across each valve element is reduced, effectively canceling out the opposing fluid pressure force that normally resists pushrod movement. The counterbalancing pressure distribution enables the pushrod to be shifted with minimal force while maintaining reliable flow path switching capability.
2Reliability
If a drive unit capable of applying large force is used to shift the pushrod, then the flow path can be switched, but the energy consumption increases
Solution Approach 1:
By establishing pressure equalizing paths between the back pressure chambers, the invention creates a balanced pressure distribution that counteracts the fluid pressure opposing valve element movement. This reduces the net force requirement for pushrod actuation, allowing the use of lower-power drive units and significantly reducing energy consumption while maintaining effective flow path switching.
Solution Approach 2:
The pressure equalizing paths enable the fluid pressure itself to serve the dual purpose of both driving flow through the selected path and simultaneously balancing the pressure on opposite sides of the valve elements. The system uses its own operating fluid to provide the counterbalancing force, eliminating the need for external energy input to overcome pressure differentials.
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
This configuration allows for efficient switching of flow paths with a small force, enhancing energy efficiency and reducing the operational burden on the drive unit.
Implementation Method 1
The valve body or the valve rod has a pressure equalizing path through which the first back pressure chamber and the second back pressure chamber are connected
Data Source
AI summary
In a flow path switching valve, when a valve rod is shifted toward a first back pressure chamber, a first valve chamber is separated from the first back pressure chamber by a first valve element, and a second valve chamber is separated from an intermediate chamber by a second valve element. When the valve rod is shifted toward a second back pressure chamber, the first valve chamber is separated from the intermediate chamber by the first valve element, and the second valve chamber is separated from the second back pressure chamber by the second valve element. The valve rod has a pressure equalizing path through which the first back pressure chamber and the second back pressure chamber are connected.