Fluid Control Valve Speed Adjustment for Sealing Integrity
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Solution Overview
Problem
Fluid control devices face challenges in achieving high sealing performance at full closure without causing damage to the valve body or valve seat surface, due to the strong pressing force required for sealing, which can lead to reduced sealing performance over time.
Innovation Solution
A fluid control device with a speed adjustment mechanism that reduces the moving speed of the valve body as it approaches the valve seat surface during full closure, using a displacement sensor to detect the distance and adjust the actuator's speed, thereby minimizing impact and maintaining high sealing performance without the need for improved mechanical accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strong pressing force is applied to achieve high sealing performance at full closure, then sealing performance is improved, but damage to valve body or valve seat surface occurs reducing reliability
Solution Approach 1:
The control mechanism performs preliminary action by detecting the distance between valve body and valve seat surface using a displacement sensor, and before contact occurs, it starts reducing the moving speed of the valve body. This preliminary speed reduction prevents impact damage while still achieving the necessary pressing force for sealing when the valve body contacts the valve seat surface.
Solution Approach 2:
The control mechanism applies beforehand cushioning by reducing the moving speed of the valve body before it contacts the valve seat surface. This speed reduction acts as a cushioning measure that prevents impact damage to the valve body and valve seat surface, while still allowing the spring to apply the necessary pressing force for high sealing performance.
2Reliability
If valve body parallel accuracy is improved to prevent damage, then sealing performance is maintained, but manufacturing complexity increases
Solution Approach 1:
The invention replaces the mechanical approach of improving valve body parallel accuracy with a control system approach. Instead of relying on high-precision mechanical manufacturing, the patent uses a displacement sensor to detect distance and a control mechanism to adjust moving speed, thereby preventing damage while maintaining sealing performance without requiring improved manufacturing precision.
3Speed
If high moving speed is maintained during full closure, then response speed is improved, but impact load increases causing damage
Solution Approach 1:
The control mechanism applies dynamics by dynamically adjusting the moving speed of the valve body during the closure process. It detects the distance between the valve body and valve seat surface using a displacement sensor, and when the distance reaches a predetermined value, it reduces the moving speed. This dynamic speed adjustment maintains high response speed for most of the closure while preventing impact load at the moment of contact.
Data Source
AI summary
Provided is a fluid control device that achieves high sealing performance at full closure, and can suppress damage to a valve body or a valve seat surface even without mechanical accuracy improvements. The fluid control device includes: a fluid control valve provided in a flow path through which fluid flows: and a control mechanism that controls the fluid control valve. The fluid control valve includes: a valve seat surface; a valve body that contacts and separates from the valve seat surface; and an actuator that drives the valve body. Further, the control mechanism includes a speed adjustment part that when the valve body is brought close to the valve seat surface in order to fully close the fluid control valve, and the valve seat surface and the valve body reach a predetermined distance apart, reduces the moving speed of the valve body more than before reaching the predetermined distance.