Check Valve Segmentation for Hydraulic Stability
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Solution Overview
Problem
Hydraulic actuators experience instability and 'chattering' due to insufficient fluid flow from the pump, causing the poppet of a check valve to repeatedly open and close, leading to unstable operation when lowering heavy loads.
Innovation Solution
A check seat assembly with a by-pass passage and a restrictive orifice is introduced, allowing flow to pass through the check valve while maintaining pressure, preventing the poppet from closing prematurely and reducing fluid pressure to stabilize the hydraulic system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the hydraulic pump provides sufficient flow to extend the rod quickly, then the productivity is improved, but the pressure drops causing the check valve poppet to close and reopen repeatedly resulting in instability
Solution Approach 1:
The check valve is segmented into two separate passages: a main flow passage for high-volume flow and a by-pass passage with restrictive orifice for pressure maintenance. This segmentation allows the system to simultaneously achieve high productivity through the main passage while maintaining stability through the by-pass passage, preventing the poppet closure issue that occurs with a single passage design
Solution Approach 2:
The by-pass passage with restrictive orifice acts as an intermediary element that maintains minimum pressure in the fluid flow path. This intermediary passage ensures that pressure remains sufficient to keep the poppet open, mediating between the high flow requirements for productivity and the pressure requirements for stability
2Stability of the object's composition
If the check valve blocks flow to maintain pressure, then the stability is improved, but the rod cannot extend smoothly causing chattering
Solution Approach 1:
The check valve is divided into two passages: the main flow passage allows unrestricted flow for smooth rod extension, while the by-pass passage with restrictive orifice maintains minimum pressure. This segmentation enables both functions to occur simultaneously without interference, eliminating the chattering problem
Solution Approach 2:
Different regions of the check valve have different flow characteristics: the main flow passage has large cross-section for high flow rate and smooth operation, while the by-pass passage has restrictive orifice for pressure maintenance. This local differentiation of flow properties allows the system to achieve both stability and smooth operation
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 prevents 'chattering' by ensuring smooth operation of the hydraulic cylinder, maintaining stability and controlled movement of the rod during load lowering by regulating fluid flow through the check valve.
Implementation Method 1
Directing the flow through the restrictive orifice reduces fluid pressure within the check valve seat to keep open a fluid flow path from the check valve seat to a pump inlet
Implementation Method 2
the check valve member is moveable between an open position and a closed position
Implementation Method 3
The check valve may comprise an o-ring seated in a V-shaped groove
Data Source
AI summary
A check seat assembly includes a check valve seat with a by-pass passage in parallel with a check valve passage of the check seat assembly to meter flow and maintain stability of a hydraulic system, such as a hydraulic cylinder. The check valve may include an o-ring seated in a V-shaped groove. The check seat assembly may allow flow from a pump to a hydraulic cylinder to freely pass through the check valve to pressurize one side of a piston of the hydraulic cylinder, such as a front side of the piston to retract a corresponding rod connected to the piston.