Double-Acting Bypass Valve With Conical Tappets for Pressure Equalization
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Solution Overview
Problem
Existing double-acting overflow valves for working cylinders have a constant or non-controllable fluid flow rate, leading to undesired back pressures and inefficiencies in pressure equalization between piston chambers, which is not economically viable or easily adjustable.
Innovation Solution
A double-acting overflow valve design featuring conical valve tappets and adjustable actuation paths, with spring elements for axial force application, allowing for pressure-dependent control of fluid flow and reliable sealing, enabling adaptable flow rates and minimizing dynamic pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a constant or non-controllable flow rate is used in existing overflow valves, then the valve structure remains simple, but undesired back pressures occur and pressure equalization becomes inefficient
Solution Approach 1:
The valve tappet is designed with a conical shape that enables the valve opening to vary dynamically based on actuation distance. As the tappet moves axially, the conical surface creates a changing annular gap between the valve disk and seat, allowing the flow rate to be controlled proportionally to the actuation distance rather than remaining constant
Solution Approach 2:
The invention changes the geometric parameter of the valve opening by using a conical valve tappet instead of a cylindrical one. This conical geometry transforms the relationship between actuation distance and flow rate from non-controllable to controllable, enabling proportional flow control that improves pressure equalization efficiency
2Ease of manufacture
If an elastomer blocking body is used to achieve simple structure and low cost, then manufacturing is economical, but the blocking body must withstand high mechanical loads over time which compromises reliability
Solution Approach 1:
The invention changes the material parameter from elastomer to metal for the valve tappet and valve disk components. This material substitution enables the valve to withstand high mechanical loads and repeated actuation cycles while maintaining reliability, though it increases manufacturing complexity compared to pure elastomer solutions
3Adaptability or versatility
If adjustable actuation paths are implemented to control flow rates, then flow control becomes adaptable to different operating conditions, but the valve design becomes more complex
Solution Approach 1:
The valve system is segmented into modular components including the conical valve tappet, adjustable stop mechanism, and spring element. This segmentation allows the actuation path to be independently adjusted by modifying the stop position, enabling flow rate adaptation without redesigning the entire valve structure
Solution Approach 2:
The adjustable stop mechanism enables dynamic adaptation of the actuation path length. By changing the stop position, the maximum travel distance of the valve tappet is adjusted, which directly controls the maximum flow rate through the conical valve opening, providing adaptability to different operating conditions
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 provides adjustable and pressure-dependent control of fluid flow rates, preventing dynamic pressures and allowing for efficient compensation of leakage flows, with adaptable settings for different operating conditions, ensuring reliable sealing and efficient operation.
Implementation Method 1
a first spring element (70) and a second spring element (80} arranged on the first and second valve bodies (30; 40), wherein the spring elements (70; 80) are designed to apply an axial force to the valve bodies (30; 40)
Implementation Method 2
the first valve tappet (31) is conical, with the diameter of the first valve tappet (31) increasing starting from the first valve tappet head (34) in the direction of the first valve tappet foot (35). In an open position of the overflow valve (10), the first valve tappet (31) forms a first annular gap together with the first axial bore (26)
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a double-acting overflow valve of a working cylinder, having a housing (20), a first and a second valve element (30; 40), a first and a second counter bearing (50; 60), and a first and a second spring element (70; 80). The housing (20) has an encompassing wall (21) and a first and a second axial delimiting wall (22; 23) which are arranged opposite each other, and the encompassing wall (21) and the delimiting walls (22; 23) form an interior (25). The first axial delimiting wall (22) has a first axial bore (26) and forms a first annular valve bearing surface (27) on the interior, said valve bearing surface surrounding the first axial bore (26), and the second axial delimiting wall (23) has a second axial bore (28) and forms a second annular valve bearing surface (29) on the interior, said valve bearing surface surrounding the second axial bore (28). The first valve element (30) has a first valve tappet (31), a first valve disc (32), and a first actuation path limiter (33). The first valve tappet (31) has a first valve tappet head (34) and a first valve tappet foot (35), and the first valve tappet foot (35) of the first valve tappet sits on the first valve disc (32). The first valve tappet (31) passes through the first axial bore (26) and has a conical shape, and the first valve tappet (31) and the first axial bore (26) form a first annular gap (36) in an open position, the gap width of said annular gap depending on an actuation path of the first valve element (30). The first valve disc (32) has a first axial annular surface (37) which surrounds the first valve tappet foot (35), and the first axial annular surface (37) and the first annular valve bearing surface (27) form a sealing plane in a closed position. The first actuation path limiter (33) sits on the first valve disc (32), and the first valve tappet (31) and the first actuation path limiter (33) are arranged axially opposite each other. The first actuation path limiter (33) has a first actuating element (38), and the first actuating element (38) defines a maximum actuation path of the first valve element (30) by acting on the first counter bearing (50). The second valve element (40) has a second valve tappet (41), a second valve disc (42), and a second actuation path limiter (43). The second valve tappet (41) has a second valve tappet head (44) and a second valve tappet foot (45), and the second valve tappet foot (45) of the second valve tappet sits on the second valve disc (42). The second valve tappet (41) passes through the second bore (28) and has a conical shape, and the second valve tappet (41) and the second axial bore (28) form a second annular gap (46) in an open position, the gap width of said annular gap depending on an actuation path of the second valve element (40). The second valve disc (42) has a second axial annular surface (47) which surrounds the second valve tappet foot (45), and the second axial annular surface (47) and the second annular valve bearing surface (29) form a sealing plane in a closed position. The second actuation path limiter (43) sits on the second valve disc (42), and the second valve tappet (41) and the second actuation path limiter (43) are arranged axially opposite each other. The second actuation path limiter (43) has a second actuating element (48), and the second actuating element (48) defines a maximum actuation path of the second valve element (40) by acting on the second counter bearing (60), wherein the first spring element (70) applies an axial force to the first valve element (30) in the direction of the closed position, and the second spring element (80) applies an axial force to the second valve element (40) in the direction of the closed position.