Proportional Sequence Valve Pin Spool Pressure Amplification
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Solution Overview
Problem
Conventional pressure control valves, such as pilot operated relief valves and direct acting pressure reducing valves, face limitations in high-pressure applications, including lower maximum pressure capabilities and leakage issues in pilot operated valves, and the need for large solenoids in direct acting valves.
Innovation Solution
A proportional sequence valve using a spool and pin configuration within a valve body, where the pin is moveable relative to the spool, allowing high pressure to act on both the annular surface of the spool and the cross-sectional area of the pin, creating an amplification factor to modulate pressure effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pilot operated relief valve is used for pressure control, then pressure control function is provided, but the maximum pressure and leakage performance deteriorate in high pressure applications
Solution Approach 1:
The valve is divided into a main valve body and a separate pressure control valve assembly that can be independently adjusted. This segmentation allows the pressure control function to be optimized separately from the main flow path, enabling reliable pressure control at high pressures without the leakage issues that plague integrated pilot operated designs.
Solution Approach 2:
A separate pressure control valve acts as an intermediary device to regulate pressure independently. This intermediary mechanism provides precise pressure control without requiring a pilot section that would be subject to the same high pressure and leakage problems, thus improving both pressure capability and control reliability.
2Speed
If a direct acting pressure reducing valve with solenoid is used, then rapid response to pressure buildup is achieved, but the solenoid size increases disadvantageously in high-pressure applications
Solution Approach 1:
The design replaces the need for a large high-pressure solenoid with a mechanical pressure control mechanism. The pressure control valve uses a spring-loaded piston and adjustable orifice to provide rapid pressure response without requiring electromagnetic actuation, thereby eliminating the need for oversized solenoids while maintaining fast response characteristics.
Solution Approach 2:
The pressure control valve operates automatically based on pressure differential across the piston, requiring no external solenoid actuation. The system self-regulates pressure through the adjustable orifice and spring mechanism, providing rapid response to pressure changes without the energy and size constraints of high-pressure solenoids.
3Reliability
If a pilot operated relief valve is used, then pressure control function is provided, but leakage increases during high pressure operations
Solution Approach 1:
By separating the pressure control function into an independent adjustable pressure control valve with its own seat and orifice, the design eliminates the pilot section that causes leakage in conventional designs. Each component operates independently at optimized pressure differentials, preventing the leakage that occurs when pilot sections are subjected to high main line pressures.
4Reliability
If conventional pressure control valves are used, then basic pressure control is achieved, but pressure modulation capability is insufficient for high-pressure applications
Solution Approach 1:
The pressure control valve features an adjustable orifice size that can be modified to change the pressure reduction ratio. This dynamic adjustability allows the same valve to adapt to different pressure modulation requirements across various high-pressure applications, providing versatile pressure control capability while maintaining reliable operation at elevated pressures.
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 valve efficiently controls high pressure by allowing independent control pressures to act on the spool, enhancing pressure modulation and reducing the need for large solenoids, thereby improving performance in high-pressure applications.
Implementation Method 1
the pin and the spool being concentric and moveable along a common axis. High pressure fluid flow through the fluid passage acts against a cross-sectional area of the pin and an annular area of the spool at the second end of the spool
Data Source
AI summary
A valve member having a supply pressure and a method of controlling the supply pressure in the valve member includes a valve body having a fluid inlet, a fluid outlet, and a controlled port. The valve member includes a spool moveable within the valve body to fluidly connect at least one of the fluid inlet and the fluid outlet with the controlled port. The spool includes an end in fluid communication with a control pressure port and a pin received within the end of the spool that is moveable relative to the spool. Fluid flow through the control pressure port acts against a cross-sectional area of the pin and an annular area of the spool to modulate the supply pressure through the valve member.