Axial Valve Spring Calibration Without Response Shift
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Solution Overview
Problem
Differential Pressure Control Valves (DPCVs) in hydraulic circuits face challenges in maintaining constant pressure differential between delivery and return branches due to fluctuations, and existing adjustment methods alter the valve's response characteristics, making them sensitive or insensitive to pressure variations.
Innovation Solution
An axial valve design with a spring-loaded elastic membrane, where the membrane is acted upon by both return and delivery fluid pressures, maintaining equilibrium until pressure differential changes cause displacement to regulate fluid flow, allowing for adjustable calibration without altering the valve's response characteristics, and featuring a simplified assembly process for easy installation and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the spring compression is adjusted to change the differential pressure threshold, then the spring reaction force increases, but the relative position of closing member and seat is altered, modifying the valve response characteristic
Solution Approach 1:
The valve is divided into two independent adjustment mechanisms: one for spring compression (affecting force) and one for closing member position (affecting response characteristic). This segmentation allows independent adjustment of each parameter without affecting the other, resolving the contradiction between adjusting spring force and maintaining valve response characteristics.
Solution Approach 2:
The closing member is made adjustable in position relative to the seat through a threaded connection mechanism. This dynamic adjustment capability allows the closing member position to be optimized independently after spring compression is set, ensuring that changes in spring force do not permanently alter the valve response characteristics.
2Manufacturing precision
If the closing member position is adjusted to modify response characteristic, then the valve sensitivity changes, but the spring reaction force and differential pressure threshold are altered
Solution Approach 1:
The adjustment mechanism is segmented into two independent controls: one for spring compression (affecting force) and one for closing member position (affecting response characteristic). This allows the closing member position to be adjusted without changing the spring reaction force, as the spring compression can be independently set and maintained.
3Adaptability or versatility
If complex adjustment mechanisms are used to independently control spring force and closing member position, then valve calibration flexibility improves, but device complexity increases
Solution Approach 1:
Both the spring compression adjustment and closing member position adjustment are integrated into a single valve body structure with coordinated adjustment mechanisms. The adjustment member threads into the valve body and provides control over both parameters through a unified design, reducing overall complexity while maintaining calibration flexibility.
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 axial valve maintains constant differential pressure and throughput by adjusting the spring force without modifying the valve's responsiveness, facilitating easy installation and reducing friction and wear, ensuring effective operation across varying pressure conditions.
Implementation Method 1
an elastic membrane (70) arranged between the disk (21) and the closing element (61) perpendicularly relative to the longitudinal axis X-X
Implementation Method 2
a spring (30) coaxially arranged on the outside of the tubular body (20) and acting with a predefined prestressing force F on the membrane (70)
Data Source
AI summary
An axial differential pressure control valve (DPCV) having an annular body, a tubular body, a coaxial closing member for closing an outlet aperture for exit of the fluid from the tubular body, sealing separation means arranged between first and second chambers containing the return fluid and the delivery fluid, respectively, said separation means being movable axially upon activation of a thrust due to a pressure differential ΔP=P1−P2 and to the spring, wherein the closing member is fixed, and further comprising pins axially arranged between the ring nut and the abutment flange of the spring, wherein the pins pass through the pipefitting so as to come into contact with the said abutment flange and are designed to be displaced axially upon operation of the ring nut independently of the fixed closing member, so as to vary the compression of the spring.