Hydraulic Control System Pressure Differential Valve
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Solution Overview
Problem
Existing hydraulic systems face challenges in controlling the locking and unlocking of hydraulic elements, particularly when pressure in the main pressure chamber fails, leading to unintended movement due to malfunctions in the fluid supply or removal systems, which can cause the piston to collapse or unlock unintentionally.
Innovation Solution
A control system is implemented with a pressure control valve in the unlocking pressure chamber to prevent fluid backflow and a pressure compensation valve in the locking pressure chamber, ensuring the pressure in the locking chamber remains at least 2 bar higher than in the unlocking chamber, using a sliding piston and ball mechanism to maintain pressure and prevent unlocking, and adjustable load holding valves with check valves to manage pressure flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking body with spring force is used to engage in a locking hole to prevent spindle rotation, then the working cylinder can be locked in position, but the control of pressure medium supply becomes extremely problematic if malfunctions occur in the fluid supply or removal system
Solution Approach 1:
A pressure control valve is introduced as an intermediary component between the main pressure line and the unlocking pressure chamber. This valve mediates the pressure relationship by ensuring that pressure in the unlocking chamber is always maintained at least 2 bar lower than in the locking chamber, providing a safety buffer that prevents unintended unlocking even when other control components fail.
Solution Approach 2:
The pressure control valve provides beforehand cushioning by pre-establishing a pressure differential safety margin. By maintaining the unlocking chamber pressure at least 2 bar lower than the locking chamber pressure under all operating conditions, the system is cushioned against malfunction scenarios where pressure control might otherwise fail, ensuring the locking body remains engaged.
2Reliability
If pressure in the main pressure chamber breaks down due to sealing failures, then the piston automatically collapses under load pressure, but unintended movement occurs due to malfunctions in fluid supply or removal systems
Solution Approach 1:
The pressure control valve acts as a protective intermediary that decouples the pressure states of the locking and unlocking chambers. Even when sealing failures or fluid supply malfunctions occur in the main system, this intermediary ensures the critical pressure differential is maintained, preventing the hydraulic element from unintentionally moving or collapsing.
Solution Approach 2:
By pre-establishing and maintaining the 2 bar pressure differential through the pressure control valve, the system is cushioned against harmful effects of pressure breakdown. This beforehand cushioning ensures that even if sealing sleeves break or fluid supply malfunctions occur, the locking chamber maintains sufficient pressure to keep the locking body engaged, preventing unintended piston collapse or movement.
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 solution ensures reliable locking and unlocking of hydraulic elements by maintaining desired pressure differences and preventing unintended movement, even in the presence of malfunctions or leaks, thereby enhancing system stability and load handling capabilities.
Implementation Method 1
a pressure control valve is switched into the line to the unlocking pressure chamber, which prevents the fluid from flowing back out of the unlocking pressure chamber
Implementation Method 2
a pressure compensation valve is switched on in the line to the locking pressure chamber... the sliding piston presses on a ball that is under the pressure of a spring
Implementation Method 3
The sliding piston presses on a ball that is under the pressure of a spring. The sliding piston can press the ball into a ball seat in which the ball is automatically leveled
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
In the case of a control system for a hydraulic element (14) which, under the pressure of hydraulic fluid in a locking pressure space (16) on one side of the hydraulic element (14) enters into an unlocking pressure space (13) on the other side of the hydraulic element (14), wherein the two pressure spaces (13, 16) are connected via a respective line (19) and (20) to the same main line (3, 4), a pressure-regulating valve (18) is to be connected into the line (19) to the unlocking pressure space (13), preventing the fluid from flowing back out of the unlocking pressure space (13). Furthermore, a pressure-compensating valve (21) is to be connected into the line (20) to the locking pressure space (16).