Slide-Type Pressure Control Valve Damping Arrangement
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Solution Overview
Problem
Conventional pressure control valves with damping diaphragms in the working port require additional sealing points, leading to potential leakage and reduced damping effect due to force effects on the piston, while diaphragm damping in the unpressurized tank port may result in unreliable oil filling.
Innovation Solution
A stepped control piston design with tightly sealed displacement chambers and a damping arrangement near the tank outlet, which uses a rib to separate compensating chambers and incorporates damping elements like throttle holes or grooves, ensuring reliable damping without additional seals or components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If damping diaphragms are placed in the working port, then damping effect is achieved, but additional sealing points are required leading to potential leakage
Solution Approach 1:
The damping diaphragms are extracted from the working port and relocated to the tank port, eliminating the need for additional sealing points in the pressure-critical working port while maintaining the damping function through the tank port's damping chamber
Solution Approach 2:
The tank port serves as an intermediary location housing the damping chamber, allowing the damping function to be decoupled from the working port while still effectively damping piston movement through the displaced volume mechanism
2Device complexity
If damping diaphragms are placed in the unpressurized tank port, then sealing is simplified, but reliable oil filling of the damping chamber becomes problematic
Solution Approach 1:
The damping chamber is pre-filled with hydraulic oil through the tank outlet connection before the valve begins operation, ensuring that the damping diaphragms are properly lubricated and positioned from the start, preventing air entrapment and ensuring reliable damping function
Solution Approach 2:
The tank outlet serves a dual function: it allows oil to flow from the valve to the tank while simultaneously providing a pathway for oil to fill the damping chamber, enabling the system to self-fill without additional components
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 provides precise self-control and maintains damping effect over the valve's life cycle with reduced manufacturing complexity and costs, ensuring reliable operation and minimizing leakage.
Implementation Method 1
When this hydraulic oil flows through a damping diaphragm or damping throttle, a pressure drop sets in which damps the movement of the control piston as a function of speed
Implementation Method 2
hydraulic oil is displaced during movement of the control piston. When this hydraulic oil flows through a damping diaphragm or damping throttle, a pressure drop sets in which damps the movement of the control piston as a function of speed
Data Source
AI summary
A slide-type pressure control valve having an improved damping behavior is described.