Monoblock Load Holding Valve Layout for Low Loss and Overpressure
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Solution Overview
Problem
Existing hydraulic valves suffer from hydraulic load losses, deformation due to sudden pressure increases, and risk of fluid leaks and structural issues under high pressures, especially in applications like earth-moving machines.
Innovation Solution
A hydraulic valve design featuring a single-piece valve block with strategically arranged conduits and connection conduits that mitigate hydraulic load losses and deformation by managing fluid pressure effectively, while reducing the risk of leaks and structural issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional hydraulic valve designs are used, then the valve can operate under high pressure, but hydraulic load losses occur due to fluid motion inside the valve
Solution Approach 1:
The distal connection conduit is designed with a curved longitudinal axis that tilts progressively from the first conduit to the second conduit. This curved geometry reduces flow separation and turbulence compared to sharp angles, thereby reducing hydraulic load losses while maintaining a compact valve structure.
Solution Approach 2:
The connection conduits are arranged in three-dimensional space with varying orientations. The distal connection conduit tilts along its length, utilizing spatial dimensionality to optimize fluid flow paths and reduce resistance without increasing the overall valve footprint.
2Strength
If the valve is subjected to sudden pressure increases, then the valve must withstand high forces, but deformation occurs in valve parts
Solution Approach 1:
The valve block is designed as a single-piece construction with internally integrated conduits. This segmentation of the fluid path within the solid valve body creates a rigid structure that resists deformation under sudden pressure increases, while the distributed conduit arrangement balances internal stresses.
Solution Approach 2:
The valve block is made from a single piece of material optimized for high-pressure resistance. The monolithic construction eliminates weak joints and ensures uniform stress distribution throughout the valve body when subjected to pressure peaks up to 1000 bar.
3Loss of energy
If the distal connection conduit has a tilted axis, then hydraulic load losses are reduced, but manufacturing complexity increases
Solution Approach 1:
The valve block is manufactured as a single piece with all conduits integrated during the forming process. This monolithic approach, particularly suitable for injection molding or similar processes, allows complex curved conduit geometries to be created in one step, avoiding the need for separate machining or assembly operations.
Solution Approach 2:
The conduit geometry parameters, including the tilt angle and curvature of the distal connection conduit, are optimized during the design phase to balance hydraulic performance with manufacturability. The curved axis design is implemented through mold cavity shaping rather than post-processing, simplifying manufacturing while achieving the desired flow characteristics.
Data Source
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AI summary
A hydraulic valve for an excavator is disclosed, which is able to limit hydraulic load losses and deformation of the valve due to overpressure, with a valve block (1) made of a single piece in which a first conduit (13) connects two openings (3, 6) one (6) of which is arranged on a side (5) of the valve block, a second conduit (14) connects another two openings (7, 9) one (7) of which is arranged on the aforesaid side (5), and other two conduits (15, 16) that connect the first conduit (13) to the second conduit (14), in which a connection conduit (15) is near the aforesaid side (5) and another connection conduit (16) is far from the aforesaid side (5) and extends with a tilted longitudinal axis so as to approach the aforesaid side (5) proceeding from the first conduit (13) to the second conduit (14).