Threadless Valve Sleeve Locking for Hydraulic Pressure Calibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pressure limiting oil-hydraulic valves are complex, time-consuming to calibrate, and lack reliability, often failing to maintain precise opening at the calibrated operating pressure, especially in applications requiring high precision.
Innovation Solution
A pressure limiting valve with a threadless mechanical connection between the sleeve and stem, using plastic deformation or laser welding for irreversible locking, allowing for dynamic positioning and precise calibration without threading, ensuring consistent spring force and reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a threaded connection is used between the sleeve and stem, then the valve can be assembled and disassembled for calibration, but the assembly becomes complex and calibration time increases
Solution Approach 1:
The patent removes the threaded connection between the sleeve and stem, extracting the complexity of threading while maintaining calibration capability through direct positioning and locking mechanisms. This simplifies the assembly structure while preserving the essential function of adjustable calibration.
2Measurement precision
If traditional calibration method is used in situ, then the valve can be calibrated to precise operating pressure, but the calibration process is time-consuming
Solution Approach 1:
The patent enables preliminary positioning of the sleeve on the stem before final assembly, allowing calibration to be performed on the stem-sleeve subassembly rather than requiring time-consuming in-situ calibration after complete valve assembly. This preliminary action significantly reduces calibration time while maintaining precision.
3Reliability
If the valve uses a complex locking system to prevent unscrewing, then reliability improves, but the structure becomes more complex and assembly longer
Solution Approach 1:
The patent replaces the threaded mechanical connection with a direct positioning system using shoulders, recesses, and locking elements that prevent unscrewing without requiring complex threading. This substitution maintains reliability by preventing sleeve displacement while simplifying the overall structure and reducing assembly complexity.
4Adaptability or versatility
If threaded connection is used, then the sleeve can be adjusted to different positions, but the manufacturing and assembly process becomes more complex
Solution Approach 1:
The patent extracts the threading feature from the design, replacing it with simpler direct connection methods such as shouldered stems and recessed sleeves that allow position adjustment through straightforward assembly operations. This maintains adaptability while significantly improving ease of manufacture.
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 simplifies the manufacturing process, enhances reliability, and ensures precise calibration and stable operation by maintaining the desired operating pressure over time, reducing assembly time and complexity while ensuring high precision and reliability.
Implementation Method 1
a spring arranged between the sleeve and the valve body and designed to exert a force on said closing member along said longitudinal or axial direction, in the closing direction
Implementation Method 2
said sleeve is irreversibly locked to said stem by means of a threadless mechanical connection, in a predefined longitudinal (or axial) position of the said stem
Implementation Method 3
using plastic deformation or laser welding for irreversible locking
Data Source
AI summary
A pressure limiting valve (1), operationally arranged between a high pressure zone and low pressure zone (HP, LP) of a hydraulic circuit, comprises: a valve body (4) defining a passage (11) for a fluid; a closing member (8) having a stem (10) and a closing head (9) connected thereto and movably engaged with the valve body (4) so as to move along a longitudinal or axial direction (X) between positions (P1, P2) for closing and opening the passage (11), in an opening direction (OD) and closing direction (CD), respectively; a sleeve (12) which is joined to the stem (10); a spring (S1) arranged between the sleeve (12) and the valve body (4) so as to exert a force on the closing member (8) along said longitudinal or axial direction (X), in the closing direction (CD); said sleeve (12) is irreversibly locked to the stem (10) by means of a threadless mechanical connection, in a predefined longitudinal or axial position of the said stem (10), so that the spring (S1) exerts a force of predefined value on the closing member (8) arranged in the closed position (P).