Concentric Valve Spool Arrangement for Hydraulic Loop Flushing
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Solution Overview
Problem
Existing hydraulic loop-flushing systems in hydrostatic apparatuses suffer from pressure oscillations and noise due to periodic opening and closing of flushing valves, which hinder effective lubrication and cooling of components and can cause damage.
Innovation Solution
A loop-flushing system with a concentric arrangement of a first flushing valve spool and a shuttle valve spool, where both must be in open positions simultaneously to enable fluid connection between the low pressure inlet and discharge outlet, eliminating the influence of pressure drops from the shuttle valve on the flushing valve and reducing system size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional loop-flushing system with separate flushing valve and shuttle valve is used, then the system can provide lubrication and cooling functions, but pressure oscillations and noise occur due to periodic opening and closing of the flushing valve
Solution Approach 1:
The patent combines the flushing valve and shuttle valve into a single integrated valve unit with a common valve body and shared valve bore. The flushing valve spool and shuttle valve spool are arranged concentrically within the same valve bore, allowing both functions to be performed by a unified structure rather than separate components, thereby eliminating pressure oscillations caused by independent valve operations
Solution Approach 2:
The flushing valve spool is nested concentrically within the shuttle valve spool, or vice versa, within the same valve bore. This nested arrangement allows the smaller valve to be positioned inside the larger valve structure, sharing the same axial movement space and enabling coordinated operation to prevent pressure oscillations
2Ease of operation
If the flushing valve is positioned downstream of the shuttle valve, then the system can control fluid flow direction, but pressure drops from the shuttle valve influence the flushing valve operation causing instability
Solution Approach 1:
Instead of arranging valves in a linear downstream-upstream sequence, the patent transitions to a concentric radial arrangement where both valves operate independently in the same axial dimension. This dimensional reorganization allows both valves to respond directly to system pressure conditions without sequential pressure drops affecting their operation
3Adaptability or versatility
If separate flushing valve and shuttle valve are used in conventional systems, then each valve can be independently controlled, but the system size and complexity increase
Solution Approach 1:
The patent merges two separate valve assemblies into a single integrated valve body containing both the flushing valve mechanism and shuttle valve mechanism. This consolidation reduces the number of separate components, simplifies system construction, and decreases overall size while preserving the independent control capabilities of each valve through their respective spools operating within the shared valve bore
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 configuration prevents pressure oscillations, ensures a constant flush flow, reduces noise, and allows for a compact design, enabling efficient lubrication and cooling while minimizing modifications to existing systems.
Implementation Method 1
a first flushing valve spool (12) being arranged elastically pre-stressed within the valve bore for enabling a fluid connection between the low pressure inlet (6) and the discharge outlet (7) by means of a first fluid channel (16)
Data Source
AI summary
A valve housing includes a cylindrical valve bore with a high pressure inlet, a low pressure inlet and a discharge outlet. A first flushing valve spool is arranged elastically pre-stressed within the valve bore for enabling a fluid connection between the low pressure inlet and the discharge outlet. A shuttle valve spool is arranged elastically pre-stressed within the valve bore for enabling the fluid connection between the low pressure inlet and the discharge outlet. The first flushing valve spool is moveable into an open position if the fluid pressure at the low pressure inlet exceeds a first threshold value, and the shuttle valve spool is moveable into an open position for connecting the low pressure inlet with the discharge outlet, if the pressure difference between the high pressure inlet and the low pressure inlet exceeds a second threshold value.