Compact Valve Block Single Pressure-Limiting Valve
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Solution Overview
Problem
Existing hydraulic valve assemblies are costly, mechanically complex, and inefficient due to the need for multiple pressure-limiting valves and large, energy-wasting pressure-reducing valves, which consume excessive space and lead to high pressure losses.
Innovation Solution
A compact valve assembly with a single pressure-limiting valve for multiple control valves, utilizing a shuttle valve to connect the load-sensing flow path with the highest pressure to a variable-capacity pump and a pressure-limiting valve to limit supply pressure, reducing mechanical complexity and space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple pressure-limiting valves are provided for multiple consumer connections, then supply pressure can be limited for each control valve, but the valve assembly becomes mechanically complex and requires large space
Solution Approach 1:
The patent combines multiple pressure-limiting functions into a single pressure-limiting valve that serves all consumer connections. The valve body integrates multiple valve seats and spring chambers, allowing one valve to limit pressure for multiple control valves simultaneously, thereby reducing mechanical complexity while maintaining reliable pressure limitation.
Solution Approach 2:
The single pressure-limiting valve is designed with universal functionality to handle multiple consumer connections. It features multiple valve seats arranged around a central valve element, enabling one valve to perform the pressure-limiting function for several different control valves and consumer connections at the same time.
2Reliability
If a pressure-reducing valve of large design is used to limit supply pressure, then pressure limitation is achieved, but excessive space is required and pressure losses increase
Solution Approach 1:
The pressure-limiting function is merged into the existing valve block structure rather than using a separate large pressure-reducing valve. The valve utilizes the existing hydraulic flow paths and integrates the pressure-limiting mechanism within the compact valve body, significantly reducing the overall space required while maintaining effective pressure limitation.
3Reliability
If a pressure-reducing valve is arranged in the main oil flow, then supply pressure can be limited, but high pressure losses occur due to continuous flow through the valve
Solution Approach 1:
The pressure-limiting valve operates periodically rather than continuously. The valve element opens and closes based on pressure conditions, allowing flow to pass through when pressure is below the limit and closing when the limit is reached. This periodic operation minimizes pressure losses by avoiding continuous flow restriction while still maintaining reliable pressure limitation.
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 costs, saves space, and minimizes energy losses by allowing a single pressure-limiting valve to manage supply pressure for multiple control valves, while enabling higher pressure for essential functions like steering and lifting gear, and smaller hydraulic cylinders for improved visibility and efficiency.
Implementation Method 1
the pressure gradient and therefore also the volumetric flow at the respective metering orifice constant, irrespective of the load
Implementation Method 2
Its piston is biased towards a usually open neutral position by a spring, which exerts an ideally constant force
Implementation Method 3
at a set maximum pressure the pressure-limiting valve opens a connection to the tank, so that the load pressure signaled cannot exceed a specific level
Data Source
AI summary
A valve block includes a plurality of control valve disks that form a first block part and a second block part. A supply pressure for the control valve disks of the first block part is limited by a common pressure-limiting valve. The common pressure-limiting valve is arranged such that a prevailing load pressure registered by the control valve disks does not exceed a specific value. The supply pressure for the control valve disks of the second block part is not limited.