Double-Spring Hysteretic Pressure Control Valve for Precision
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Solution Overview
Problem
Current hydraulic valves, especially in low-pressure operating environments, face challenges with low precision, slow response speed, high noise, and poor resistance to soiling, making them inefficient and costly, particularly in high-precision applications.
Innovation Solution
A double-spring and high-precision hysteretic pressure control valve with a simple structure, featuring a lower and upper valve body, a double-spring pressure adjustment mechanism, and a spring energy storage linkage, allowing for precise control and fast response through the interaction of rough and fine adjustment springs and a main valve spool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pressure control valves are used, then the structure is simple and cost is low, but control precision and response speed are poor
Solution Approach 1:
The pressure control valve is divided into multiple functional components: a main valve body, a pilot valve assembly, a double-spring mechanism (pre-load spring and control spring), and a spool valve. This segmentation allows each component to perform its specific function efficiently, improving overall control precision while keeping individual components relatively simple
Solution Approach 2:
A pilot valve is introduced as an intermediary component to control the main valve spool. The pilot valve receives low-pressure control signals and uses them to regulate the main valve, achieving high-precision control without requiring the entire valve to be complex. The pilot valve acts as a mediator between the control system and the main fluid flow
2Speed
If conventional pressure control valves are used, then the structure is simple, but response speed is slow
Solution Approach 1:
The pre-load spring is pre-compressed to store elastic potential energy before operation. When control pressure is applied, this pre-stored energy immediately assists in moving the spool valve, eliminating delay and achieving fast response. The preliminary action of pre-compressing the spring prepares the system for instant reaction
Solution Approach 2:
The pilot valve serves as a fast-responding intermediary that quickly translates small control pressure changes into spool movement. By separating the control function into a dedicated pilot valve with minimal moving mass, the system achieves rapid response without requiring the entire valve structure to be complex
3Measurement precision
If proportional pressure valves or servo valves are used, then control precision is high, but cost is very high
Solution Approach 1:
The invention replaces expensive proportional valves and servo valves with a simpler pilot-operated pressure control valve using basic mechanical components (springs, spools, and valve bodies). This design achieves comparable control precision through clever mechanical leverage rather than expensive electronic actuators, significantly reducing manufacturing cost
Solution Approach 2:
The pilot valve acts as a cost-effective intermediary that provides high-precision control signals to the main valve. This two-stage approach (pilot valve + main valve) achieves servo-like precision using simple, inexpensive components rather than requiring an expensive single-stage servo valve
4Reliability
If conventional pressure control valves are used, then the structure is simple, but resistance to soiling is poor
Solution Approach 1:
The pilot valve is designed as a separate, extractable assembly that can be easily removed and cleaned independently from the main valve body. This separation allows thorough cleaning of the precision pilot valve components without disassembling the entire valve, improving resistance to soiling while maintaining relatively simple overall structure
Solution Approach 2:
By segmenting the valve into modular components (main valve body, pilot valve assembly, spring mechanisms), each segment can be independently cleaned and maintained. This modular segmentation improves resistance to soiling by enabling targeted cleaning of contaminated areas without requiring complete system disassembly
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 achieves high control precision, fast response speed, and momentary operation under low pressure, addressing the limitations of existing hydraulic valves with a cost-effective and reliable design.
Implementation Method 1
both ends of the tension spring 18 are engaged with a right portion of the valve spool control linkage 17 and the tension spring sliding hook 3, respectively; when the pressure adjustment valve spool 6 drives the tension spring shift lever 2 to move up/down, a lower/upper claw 29 of the tension spring shift lever 2 drives the tension spring sliding hook 3 to move up/down along the arc guide rail 5: when the tension spring sliding hook 3 moves to an upper-most position on the arc guide rail 5, the right end of the valve spool control linkage 17 moves upwards to its upper-most position; when the tension spring sliding hook 3 moves to a lower-most position on the arc guide rail 5, the right end of the valve spool control linkage 17 moves downwards to its lower-most position
Implementation Method 2
the rough adjustment spring 10 and the fine adjustment spring 11 are both engaged with the pressure adjustment valve spool 6; upper and lower ends of the rough adjustment spring 10 are sleeved on the rough adjustment spring mounting boss 12 and the spring guide pillar, respectively, upper and lower ends of the fine adjustment spring 11 are sleeved on the fine adjustment spring mounting boss 13 and the spring guide pillar, respectively
Data Source
AI summary
Disclosed in the present invention is a double-spring and high-precision hysteretic pressure control valve, including an upper valve body, a lower valve body, a double-spring pressure adjustment valve, a spring energy storage linkage mechanism, and a main valve. The double-spring pressure adjustment valve includes a rough adjustment stud, a rough adjustment spring, a fine adjustment stud, a fine adjustment spring, a spring guide sleeve, and a pressure adjustment valve spool. The spring energy storage linkage mechanism includes a guide block, a valve spool control linkage, a tension spring, and a tension spring shift lever and a tension spring sliding hook. The valve spool control linkage is connected to the guide block at one end, and connected to a main valve spool drive rod via a pin at the other end. The tension spring sliding hook is mounted on the guide block, and one end of the shift lever is placed below the tension spring sliding hook so as to drive the tension spring sliding hook to move upwards, thereby controlling the state of the tension spring and enabling energy storage of the spring. The spring energy storage linkage mechanism make the valve spool to open and close momentarily at the right portion. The double-spring and high-precision hysteretic pressure control valve according to the present invention has a low cost, and can provide precise control of opening and closing pressures for the pressure control valve and control of both states of opening and closing for the main valve.