Combined Pressure-Limiting Overflow Valve Spring Adjustment
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Solution Overview
Problem
Current air treatment systems in commercial vehicles face challenges in precisely setting and maintaining the opening and closing pressures of pressure relief and overflow valves, leading to tolerance ranges that can overlap and affect the intended filling sequence of compressed air consumer circuits, especially due to aging processes and material fatigue of adjustable springs.
Innovation Solution
A combined pressure-limiting and overflow valve is developed, which forms a structurally and functionally unified unit with a single adjustment spring, reducing the number of components and allowing precise adjustment through spacers or threaded connections, thereby maintaining consistent tolerance ranges between the working points of the pressure relief and overflow valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate pressure relief valve and overflow valve are used with individual adjustable springs, then each valve can be set independently to desired pressure values, but the tolerance ranges of opening and closing pressures overlap and affect the intended filling sequence
Solution Approach 1:
The patent combines the pressure relief valve and overflow valve into a single integrated valve unit with a common adjustable spring. This merging eliminates the independence issue while maintaining precise pressure control through the unified spring mechanism that controls both valves' opening and closing pressures without tolerance overlap
Solution Approach 2:
The single adjustable spring serves multiple functions: it controls the opening pressure of the pressure relief valve, the closing pressure of the pressure relief valve, the opening pressure of the overflow valve, and the closing pressure of the overflow valve. This multi-functionality ensures consistent pressure control across all valves while eliminating the need for separate adjustment mechanisms
2Ease of manufacture
If separate pressure relief valve and overflow valve are used, then each valve has its own components, but this increases material costs, assembly costs, and space requirements
Solution Approach 1:
The patent merges multiple separate valve components (pressure relief valve piston, overflow valve piston, multiple springs, multiple seals, multiple adjusting screws) into a single integrated valve unit with fewer components. This reduces material costs, assembly complexity, and space requirements while maintaining the necessary pressure control functions
Solution Approach 2:
The integrated valve unit uses a single adjustable spring and common piston structure to perform the functions of multiple separate valves. This universal design reduces the total number of components needed while maintaining independent pressure control capabilities for both the pressure relief valve and overflow valve
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
This solution reduces material and assembly costs, saves space and weight, and ensures that the tolerance ranges of the pressure relief and overflow valves do not overlap, maintaining the desired filling sequence and operational reliability of compressed air consumer circuits.
Implementation Method 1
a single adjustable spring (11) which acts on a piston (10)
Implementation Method 2
the piston (10) moves against the spring force of the adjusting spring (11)
Data Source
Figure 1
Figure 2
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AI summary
The invention relates to a combined pressure-limiting and overflow valve, particularly for an air preparation unit in a commercial vehicle, wherein the combined pressure-limiting and overflow valve (30) comprises a housing (18), a cover (19), an inlet opening (4), a first outlet opening (7), a piston (10), an overflow valve seat (1), and a pressure-limiting valve seat (2), wherein both an opening and a closing pressure of the overflow valve seat (1) and an opening and a closing pressure of the pressure-limiting valve seat (2) can be adjusted by means of the adjusting spring (11).