Bidirectional Pressure Control Valve with Dual-Ended Spool
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Solution Overview
Problem
Conventional pressure controlling valves in fluid circuits require additional valves for bidirectional pressure control, increasing complexity, cost, and weight, as they are designed to manage pressure drop in only one direction of fluid flow.
Innovation Solution
A pressure controlling valve with a slidable spool spring-loaded to a neutral position, featuring pilot ports on either side of the spool, which allows fluid flow in both directions by using control surfaces and cavities to restrict flow when pressure differences exceed predetermined values, maintaining constant pressure drop in both flow directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two pressure controlling valves are provided for bidirectional pressure control, then pressure control capability in both flow directions is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines two separate pressure controlling valves into a single integrated valve body. The valve body contains a spool with control surfaces on both ends, allowing one valve to perform the function of two valves by controlling pressure drops in both flow directions simultaneously through its dual-ended spool mechanism.
Solution Approach 2:
The single pressure controlling valve is designed with universal functionality to handle bidirectional flow control. The spool mechanism can respond to pressure differences from either direction, making the valve capable of maintaining constant pressure drops regardless of flow direction, thus serving multiple functions with a single device.
2Adaptability or versatility
If two pressure controlling valves are provided for bidirectional pressure control, then pressure control capability in both flow directions is improved, but weight increases
Solution Approach 1:
By merging two valve functions into one physical valve body, the overall weight of the valve assembly is reduced compared to installing two separate valves. The integrated design eliminates redundant components and reduces the total material required while maintaining bidirectional pressure control capability.
3Device complexity
If a single pressure controlling valve is used for bidirectional control, then device complexity is reduced, but pressure control precision may worsen
Solution Approach 1:
The spool is designed with different control surfaces at its two ends, each optimized for controlling pressure drops in specific flow directions. This local differentiation allows each surface to be precisely engineered for its specific function, maintaining high pressure control precision while using a single valve body.
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 design enables efficient bidirectional pressure control with reduced complexity and cost by using a single valve to manage pressure drops in both directions, minimizing the need for additional valves and optimizing energy usage in fluid circuits.
Implementation Method 1
a slidable spool arranged to be spring loaded towards a neutral position in said valve body
Implementation Method 2
the pressure difference between the pilot pressure conduits will cause the spool to move
Implementation Method 3
a pressure controlling valve for controlling a pressure drop across the valve
Data Source
AI summary
A pressure controlling valve includes a slidable spool arranged to be spring loaded towards a neutral position. A first port and a second port are connected to allow a fluid flow through the valve. A first and a second pilot port are connected to a cavity adjacent a respective first and second end surface of the spool. The pilot ports are connected to a fluid conduit on either side of a fluid device causing a pressure drop in the fluid conduit and the fluid device is connected to one of the first or second ports. The spool is displaced against the spring load in response to a pressure difference between the first and the second pilot port, whereby a control surface of the spool is arranged to restrict the fluid flow through the valve when the control surface approaches a central cavity.