Poppet Valve With Integral Check Valves for Load Holding
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Solution Overview
Problem
Valve assemblies for controlling fluids in off-highway agriculture and construction equipment face challenges in efficiently managing fluid flow and load holding, particularly in maintaining a sealed position to prevent leakage and ensure extended load retention.
Innovation Solution
A poppet valve assembly with a body featuring a tapered surface for sealing engagement with a valve seat, combined with first and second check valves for one-way fluid communication, allows for precise control of fluid flow and load holding by adjusting the axial position of the poppet valve based on fluid pressure differentials, ensuring efficient operation and preventing unintended unseating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a poppet valve is used to control fluid flow and load holding, then flow control precision is improved, but the risk of unintended unseating and leakage increases
Solution Approach 1:
The patent applies local quality by creating a differentiated sealing system with two distinct check valves (first and second check valves) positioned at different locations within the valve body. Each check valve seals against its own dedicated seat, providing localized sealing zones that address different aspects of the sealing problem independently, thereby maintaining reliability while enabling precise flow control.
Solution Approach 2:
The patent implements preliminary action through the spring-loaded check valves that are pre-positioned and biased against their respective seats. This preliminary sealing action occurs before any potential leakage or unintended unseating can occur, ensuring that the valve maintains its sealed position proactively rather than reactively.
2Reliability
If check valves are added to prevent leakage and ensure load retention, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into a single integrated valve assembly. The body houses both the first and second check valves along with their respective seats and springs, combining leakage prevention, load holding, and flow control functions into one unified structure. This integration achieves high reliability without proportionally increasing overall device complexity.
Solution Approach 2:
The valve assembly achieves multi-functionality by incorporating two check valves that simultaneously provide leakage prevention, load holding, and flow control capabilities. The single valve body serves multiple purposes: housing the check valves, providing sealing surfaces, controlling fluid flow, and maintaining load position, thereby reducing the need for separate 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 poppet valve assembly effectively manages fluid flow and load holding, preventing leakage and maintaining a sealed position, thus enhancing the operational efficiency and reliability of valve assemblies in demanding applications.
Implementation Method 1
The first check valve is disposed in the first internal passage and is adapted for sealing engagement with the first check valve seat. The second check valve disposed is in the second internal passage and is adapted for sealing engagement with the second check valve seat.
Implementation Method 2
The tapered surface is configured for sealing engagement with a main valve seat... allows for precise control of fluid flow and load holding by adjusting the axial position of the poppet valve based on fluid pressure differentials
Data Source
AI summary
A poppet valve assembly includes a body and first and second check valves. The body includes opposing first and second axial end portions. The first end portion has a first circumferential surface, a first end surface, and a tapered surface, which seals with a main valve seat. The second axial end portion defines at least one metering slot. The body defines first and second internal passages. The first internal passage includes an opening in the first end surface, is in fluid communication with one of the metering slots, and has a first check valve seat. The second internal passage includes an opening in the first circumferential surface, is in fluid communication with one of the metering slot, and has a second check valve seat. The first and second check valves are disposed in the respective internal passages and are adapted for sealing engagement with the respective check valve seats.