Integrated Pressure Compensated Proportional Flow Control Valve
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pressure-compensated liquid-pressure systems require additional components and increased size due to the need for both relief and bleed valves, leading to inefficient energy use and circuit inefficiency.
Innovation Solution
A pressure-compensated electromagnetic proportional directional flow control valve integrates a solenoid-driven directional flow control valve with a single pressure-compensated valve, utilizing a pressure compensation spool and chambers to maintain constant pressure differences and control surplus liquid flow, eliminating the need for a bleed valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only a relief valve is provided on the passage extending between the oil-pressure pump and the liquid-pressure supply port, then the circuit is protected from overpressure, but the discharge pressure of the oil-pressure pump always increases up to a set pressure of the relief valve, causing uneconomical energy increase and deteriorated circuit efficiency
Solution Approach 1:
The patent combines the relief valve and bleed valve functions into a single integrated valve assembly. The relief valve releases surplus pressure oil to the tank when maximum pressure is reached, while the bleed valve selectively releases pressure oil to specific circuits only when necessary. This merging eliminates the need for separate valve components and plumbing while maintaining both circuit protection and energy efficiency.
Solution Approach 2:
The bleed valve is configured to selectively release pressure oil to different circuits based on operational requirements. Instead of continuously releasing pressure oil to all circuits, the system dynamically controls which circuits receive pressure relief, maintaining necessary discharge pressure for actuator operation while preventing uneconomical pressure increases. This dynamic control optimizes energy usage while ensuring circuit safety.
2Use of energy by moving object
If a bleed valve is additionally provided on the passage extending between the relief valve and the liquid-pressure supply port, then the discharge pressure necessary for driving the oil-pressure cylinder is maintained without uneconomically increasing the discharge pressure of the oil-pressure pump, but the number of components, the plumbing, and the size of the device increases
Solution Approach 1:
The patent integrates the relief valve and bleed valve into a single combined valve assembly with shared housing, mounting structure, and control mechanisms. The relief valve and bleed valve functions are merged within one component unit, eliminating the need for separate valve bodies, mounting hardware, and associated plumbing. This integration maintains the energy efficiency benefits of selective pressure release while reducing the overall number of components and device size.
3Reliability
If surplus pressure oil is always released to outside through the relief valve, then the circuit is protected, but the discharge pressure of the oil-pressure pump always increases up to a set pressure of the relief valve, causing uneconomical energy increase
Solution Approach 1:
The system dynamically controls pressure oil release by incorporating a bleed valve that selectively directs surplus pressure oil to specific circuits only when operational conditions require it. Instead of continuously releasing all surplus pressure oil to the tank through the relief valve, the bleed valve enables dynamic routing of pressure oil to maintain necessary discharge pressure for actuator operation. This dynamic control prevents uneconomical energy loss by maintaining pressure only when and where needed, while the relief valve provides circuit protection as a safety mechanism.
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 configuration reduces the number of components, plumbing, and device size while maintaining energy efficiency by balancing pressures and controlling flow rates without uneconomically increasing the discharge pressure of the oil-pressure pump.
Implementation Method 1
an electromagnetic proportional directional flow control valve configured to drive a directional flow control spool by a solenoid to control a flow direction and flow rate of pressure oil
Implementation Method 2
a pressure compensated valve provided between the directional flow control spool and the return port. The pressure compensated valve acts to maintain constant a pressure difference between before and after the aperture
Implementation Method 3
The pressure compensated valve compensates so as to maintain a constant flow rate of the pressure oil discharged from the oil-pressure cylinder
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A pressure compensated electromagnetic proportional directional flow control valve (1) of the present invention integrally includes: an electromagnetic proportional directional flow control valve (2) configured to be driven by a solenoid (10,11); and a pressure compensated valve (3) configured to carry out pressure compensation of a flow rate controlled by the electromagnetic proportional directional flow control valve. A pressure compensation spool (7) moves so as to balance forces of a spring (8,9), a first pressure chamber, and a second pressure chamber. With this, the pressure compensation for maintaining a constant pressure difference between an upstream side and a downstream side of a first variable aperture can be carried out, and a surplus liquid of a liquid flowing from a liquid-pressure supply port to a derivation port can flow out from a branch port to outside.