Directly Actuated Pressure Control Valve for Hydrostatic Pumps
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Solution Overview
Problem
Existing electrically controlled pressure control valves for hydrostatic pumps require significant equipment and installation space due to the combination of a main pressure control valve and an additional pilot control valve, leading to high standby pressure and control medium consumption.
Innovation Solution
A directly electrically controlled pressure control valve designed as a continuously adjustable 3/2-way valve with a spring-preloaded valve body that can be moved by an electromagnet, reducing equipment and installation space requirements, and featuring a compact differential pressure mechanism with collars and nozzles for efficient pressure regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a main pressure control valve and an additional electrically controlled pilot control valve are combined, then electrically controlled pressure regulation is achieved, but equipment outlay and installation space requirements increase
Solution Approach 1:
The patent merges the main pressure control valve and the pilot control valve into a single integrated valve body. The electromagnet is directly mounted on the valve body, eliminating the need for separate pilot control equipment. This consolidation achieves electrically controlled pressure regulation while significantly reducing equipment outlay and installation space requirements.
Solution Approach 2:
The single valve body performs multiple functions: it acts as both the main pressure control valve and the pilot control valve. The electromagnet directly actuates the valve body to regulate pressure, making the valve universal and eliminating the need for separate specialized components.
2Extent of automation
If a main pressure control valve and an additional electrically controlled pilot control valve are combined, then electrically controlled pressure regulation is achieved, but standby pressure increases
Solution Approach 1:
The integrated design eliminates the need for separate pilot control lines and components that would maintain standby pressure. The direct actuation of the valve body by the electromagnet reduces the number of pressure-containing pathways, thereby minimizing standby pressure.
3Extent of automation
If a main pressure control valve and an additional electrically controlled pilot control valve are combined, then electrically controlled pressure regulation is achieved, but control medium consumption increases
Solution Approach 1:
The unified valve structure consolidates control medium pathways, eliminating redundant channels required by separate pilot control valves. This reduces the volume of control medium needed for operation and minimizes consumption during pressure regulation cycles.
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 reduces equipment and installation space needs, minimizes standby pressure, and conserves control medium while maintaining a fail-safe maximum pump pressure setting, achieving efficient and compact pressure control.
Implementation Method 1
increasing a current of an electromagnet (22) and increasing the pump pressure at the pump port (P)
Implementation Method 2
In a normal position, preloaded by a spring (24), of a valve body (26)
Implementation Method 3
increasing the pump pressure at the pump port (P)
Data Source
AI summary
An electroproportional pressure control valve of cartridge-type construction is screwed into a housing bore of a hydrostatic pump. The cartridge includes an adjusting pressure port, a pump port, and a tank port. The adjusting pressure port is relieved to the tank port in a normal position of a spring-biased valve plunger of the pressure control valve. A connection from the pump port to the adjusting pressure port is opened counter to the force of the spring by increasing a current of an electromagnet and increasing the pump pressure at the pump port. The spring, the electromagnet, and the resultant force of the pump pressure act along a common axis of movement of the valve plunger. A first nozzle connects the adjusting pressure port to an adjusting pressure chamber. A second nozzle connects the adjusting pressure port to the tank port.