Piston-Poppet Valve Layout for Pressure-Stable Tool Flow
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Solution Overview
Problem
Existing flow control valves for pressurized fluid systems experience leakage due to pressure fluctuations, leading to inconsistent fluid pressure and reduced efficiency in operating output devices.
Innovation Solution
A novel valve design featuring a piston and poppet mechanism that maintains a sealed fluid pathway by allowing independent movement of the piston relative to the poppet, using springs and a retainer to ensure the poppet remains seated during pressure fluctuations, and a check valve that opens at a higher pressure to allow fluid flow to the tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional flow control valve is used, then fluid flow control is provided, but leakage occurs due to pressure fluctuations causing inconsistent fluid pressure
Solution Approach 1:
The valve is divided into functionally independent segments: a piston assembly that responds to pressure fluctuations and a poppet assembly that controls the sealing action. The piston can move independently within the manifold to track pressure changes, while the poppet remains seated to maintain the seal, preventing leakage without compromising pressure consistency.
Solution Approach 2:
The piston is made independently movable relative to the poppet, allowing it to dynamically adjust its position in response to pressure fluctuations. This dynamic adjustment enables the piston to track pressure changes while the poppet maintains a stable seated position, ensuring consistent sealing and preventing leakage during pressure variations.
2Reliability
If the piston and poppet are rigidly coupled, then structural simplicity is achieved, but the poppet cannot remain seated during pressure variations
Solution Approach 1:
The coupling between piston and poppet is segmented into two functional zones: a connected region where the piston rod connects to the poppet stem, and a decoupled region where the piston can move independently. This segmentation allows the piston to respond to pressure fluctuations while the poppet maintains its sealing position, achieving both reliability and manageable complexity.
Solution Approach 2:
The piston rod acts as an intermediary element between the piston and poppet. It transmits force when needed but allows relative movement through its connection mechanism, serving as a mediator that enables independent motion while maintaining functional connection. This intermediary approach resolves the conflict between structural simplicity and seal integrity.
3Speed
If the poppet is allowed to move freely with pressure changes, then responsiveness to pressure is improved, but leakage back to the reservoir increases
Solution Approach 1:
The piston is designed to be dynamically responsive to pressure changes, moving freely within the manifold to track pressure fluctuations. However, the poppet is designed with a spring bias and sealing geometry that maintains it in a seated position during normal operation. This dynamic design allows the piston to respond quickly to pressure changes while the poppet prevents leakage, resolving the contradiction between responsiveness and seal integrity.
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 valve effectively maintains consistent fluid pressure to the output device, preventing leakage back to the reservoir and ensuring efficient operation despite pressure variations.
Implementation Method 1
The piston spring biases the piston away from the poppet when the poppet is in the seated position
Implementation Method 2
a check valve spring biasing the check valve into the closed position
Implementation Method 3
the piston configured to move the poppet into the seated position when the pressurized fluid flows into the manifold via the manifold inlet at a first fluid pressure
Implementation Method 4
the check valve being movable into an open position in which the pressurized fluid may flow from the manifold via the tool outlet when the pressurized fluid flows into the manifold via the manifold inlet at a second fluid pressure which is greater than the first fluid pressure
Data Source
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AI summary
A valve is for controlling flow of a pressurized fluid to a tool. The valve has a manifold, a poppet biased into an unseated position in which the pressurized fluid may flow from the manifold via a tank outlet, a piston configured to move the poppet into a seated position when the pressurized fluid flows into the manifold via the manifold inlet at a first fluid pressure, and a check valve biased into a closed position in which the pressurized fluid is prevented from flowing from the manifold via the tool outlet. A retainer retains the poppet relative to the piston and is configured so that when the poppet is in the seated position, the piston is independently movable relative to the poppet and thus permits the poppet to remain in the seated position upon variations in fluid pressure in the manifold.