Fluid Control Valve With Split Valve Body for Low-Pressure Response
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Solution Overview
Problem
Existing fluid control valves with relief functions lack high responsiveness due to the mass and fluid resistance of the moving valve body, particularly when the pressure of the working fluid is low.
Innovation Solution
A fluid control valve design featuring a valve body axially divided into a base portion and an opening and closing portion, with a second biasing member having a lower spring force than the first biasing member, allowing the opening and closing portion to move independently and enhance responsiveness across varying fluid pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single valve body is used with series-arranged biasing means, then the valve can maintain closed state with adequate force, but the responsiveness is insufficient due to the mass and fluid resistance of the moving valve body
Solution Approach 1:
The valve body is divided into a base portion and an opening/closing portion that can move independently relative to each other. The opening/closing portion has smaller mass and can respond faster to pressure changes, while the base portion maintains the structural integrity and sealing force against the valve seat. This segmentation allows the lighter opening/closing portion to achieve high responsiveness without compromising the overall valve closing force.
2Stress or pressure
If the valve body moves against the first biasing member with high spring force, then the valve can maintain adequate closing pressure, but the responsiveness deteriorates when the working fluid pressure is low
Solution Approach 1:
By separating the valve body into base portion and opening/closing portion, the opening/closing portion can move independently with minimal resistance from the second biasing member (lower spring force), enabling fast response at low pressures. The base portion remains anchored by the first biasing member to maintain adequate closing pressure when needed.
Solution Approach 2:
The patent introduces a second biasing member with lower spring force than the first biasing member. This parameter change allows the opening/closing portion to be actuated easily at low pressures for rapid response, while the first biasing member with higher spring force ensures adequate closing pressure is maintained when the valve is in the closed state.
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 design achieves highly responsive fluid control by allowing the valve to open and close quickly without requiring movement against the first biasing force, even at low fluid pressures, thereby improving the valve's responsiveness and control characteristics.
Implementation Method 1
a first biasing member configured to bias the valve body in a valve closing direction
Implementation Method 2
a second biasing member having a spring force lower than that of the first biasing member and configured to bias the valve body in the valve closing direction
Data Source
AI summary
A fluid control valve having extremely high responsiveness not only when a pressure of a working fluid of a first flow path is high but also when the pressure of the working fluid of the first flow path is low includes: a valve seat; a valve body contacting and separating from the valve seat; a first biasing member biasing the valve body in a valve closing direction; and a second biasing member having a spring force lower than that of the first biasing member, wherein the valve body is axially divided into a base portion biased by the first biasing member and an opening and closing portion contacting and separating from the valve seat, and the second biasing member is disposed so that the base portion and the opening and closing portion are axially separable from each other.