Double-Acting Overflow Valve With Conical Tappets for Pressure Compensation
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Solution Overview
Problem
Existing double-acting overflow valves in master-slave working cylinder systems have a constant fluid flow volume, leading to undesired dynamic pressures and inability to control pressure compensation between piston chambers effectively.
Innovation Solution
A double-acting overflow valve design featuring conical valve tappets and adjustable actuation paths, with spring elements ensuring reliable sealing and pressure-dependent fluid flow control, allowing for variable gap widths and adjustable actuation paths to manage fluid flow based on pressure and mechanical forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a constant flow volume valve is used, then the structure is simple, but pressure compensation between piston chambers cannot be controlled and dynamic pressures occur
Solution Approach 1:
The valve tappet is designed with a conical shape that allows the annular gap width to vary dynamically based on axial displacement. When pressure increases, the valve tappet moves axially, automatically adjusting the gap width to modulate flow volume, transforming a static valve into a dynamic pressure-regulating device
Solution Approach 2:
The invention changes the flow area parameter by varying the annular gap width between the valve tappet and bore wall. The conical shape of the valve tappet ensures that axial displacement directly translates to controlled changes in gap width, enabling pressure-dependent flow control through parameter variation
2Reliability
If the valve allows free flow to compensate pressure losses, then pressure compensation is achieved, but undesired dynamic pressures occur in the valve interior
Solution Approach 1:
The valve system implements pressure feedback through the conical valve tappet design. When pressure differential across the valve increases, the higher pressure automatically pushes the valve tappet to increase the annular gap, allowing more flow to equalize the pressure. This self-regulating feedback mechanism prevents excessive pressure buildup while maintaining reliable compensation
Solution Approach 2:
The spring element applies a pre-compression force to the valve tappet, creating a preliminary counter-action that opposes pressure-driven displacement. This pre-applied force ensures the valve remains closed under normal conditions and only opens when pressure differential overcomes the spring force, preventing unintended dynamic pressures
3Adaptability or versatility
If a tappet with conical shape is used to create variable gap width, then flow volume can be controlled, but the valve requires more precise manufacturing
Solution Approach 1:
The valve system separates the control functions into distinct elements: the conical valve tappet for flow modulation and the actuation path limiter for maximum travel definition. This segmentation allows the conical tappet to focus solely on providing smooth variable gap width, while manufacturing tolerances are distributed across multiple components rather than requiring extreme precision in a single element
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 solution enables pressure-dependent control of fluid flow, preventing dynamic pressures and allowing for adaptable flow rates, minimizing losses and ensuring reliable sealing, thus enhancing the efficiency of pressure compensation between piston chambers.
Implementation Method 1
a first spring element and a second spring element arranged in the interior and acting on the first and second valve elements, respectively, in the direction of the axial delimiting walls
Data Source
AI summary
A double-acting overflow valve of a working cylinder includes a housing with an encompassing wall and a first and a second axial delimiting wall disposed opposite one another. A first valve body has a first valve tappet with a conical shape and passes through the first axial bore to define a first annular gap with a gap width that is dependent on a position of the first valve body along an actuation path thereof. A second valve body has a second valve tappet with a conical shape and passes through the second axial bore to a second annular gap with a gap width that is dependent on a position of the second valve body along an actuation path thereof. A first and second counter bearing are provided. A first actuating element defines a maximum actuation path of the first valve body by acting on the first counter bearing. A second actuating element defines a maximum actuation path of the second valve body by acting on the second counter bearing. A first spring applies an axial force to the first valve body in a direction of the closed position of the first valve disk. A second spring applies an axial force to the second valve body in a direction of the closed position of the second valve disk.