Hydraulic Control Valve Spool Pin Float Position
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Solution Overview
Problem
Closed centered hydraulic control valves with pressure compensation face limitations in maximum flow to consumers due to the need for physical features to isolate pump flow, which occupy valuable space on the valve spool, restricting additional or larger spool openings and thus limiting flow efficiency.
Innovation Solution
The solution involves isolating pump flow by using a spool pin to hold the pressure compensator in a fully closed position and draining the load sense signal to the tank, eliminating the need for physical features on the valve spool to shut off the pump, thereby increasing the space for additional or larger spool openings and enhancing flow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical features are added to the valve spool to isolate pump flow, then pump flow isolation is achieved, but the space for spool openings is reduced, limiting maximum flow to consumers
Solution Approach 1:
The invention extracts the pump flow isolation function from the main valve spool and relocates it to a separate pressure compensator component. By removing the isolation features from the spool, the spool's space is freed for larger openings, directly resolving the contradiction between achieving isolation and maintaining flow capacity
Solution Approach 2:
The invention segments the valve system into distinct functional components: the pressure compensator handles pump flow isolation, while the main valve spool handles flow distribution to consumers. This functional segmentation allows each component to be optimized independently, enabling the spool to have maximum flow capacity without compromise
2Reliability
If the valve spool includes features to shut off pump flow, then pump isolation is achieved, but the spool has less space for additional or larger spool openings
Solution Approach 1:
The shut-off features are extracted from the valve spool and implemented in the pressure compensator instead. This extraction allows the spool opening area to be maximized while pump isolation functionality is preserved in the separate compensator component
Solution Approach 2:
The pressure compensator acts as an intermediary component that performs the pump isolation function, allowing the main valve spool to focus solely on flow distribution with maximized opening area
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 approach allows for increased maximum flow to consumers by eliminating the need for physical features on the valve spool, resulting in improved efficiency and power of the valve function by utilizing the spool design for additional flow, particularly in both directions of operation (raise and lower).
Implementation Method 1
The spool pin acts to hold the pressure compensator in the fully closed position during pump isolation. In the fully closed position, communication of flow between the pump and the valve function is prevented.
Implementation Method 2
The valve section load sense channel (or 'signal') is drained to tank. The drain to tank of the load sense signal can be realized by a feature added to the main spool.
Data Source
AI summary
A new means of achieving a valve float position in a closed centered hydraulic control valve. The valve has a main spool position whereby pressure compensator load sense control pressure is drained to tank through the main spool. Secondly, a pin acts on the pressure compensator to prevent the main pump flow from reaching the main section spool. Finally, the new spool position adds a connection from the consumer to tank, enabling a float position.