Fluid Control Valve Segmented Seat for Sealing Durability
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Solution Overview
Problem
Poppet valve type fluid control valves face issues with sealing function deterioration due to non-constant parallelism between the valve body and seat, leading to gaps and impaired durability from excessive pressing stress on the sealing member.
Innovation Solution
A fluid control valve design featuring a shaft member, a valve body capable of swinging, and a valve seat with a protruding portion that regulates the valve body's movement, reducing excessive stress on the sealing member and enhancing durability by providing a separate component to correct posture and prevent foreign matter deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve body is pressed against the valve seat to improve sealing performance, then the sealing function is improved, but excessive pressing stress is applied to the sealing member, impairing its durability
Solution Approach 1:
The valve seat is segmented into two functional portions: an abutment portion for sealing contact and a protruding portion for movement regulation. This segmentation allows the sealing function and movement control function to be separated, enabling the sealing member to contact the abutment portion without excessive pressing stress while the protruding portion prevents foreign matter deposition by regulating valve body movement.
Solution Approach 2:
The protruding portion acts as an intermediary element between the valve body and the abutment portion. It regulates the movement of the valve body and prevents foreign matter from depositing on the abutment portion, thereby protecting the sealing interface without requiring excessive pressing stress on the sealing member.
2Reliability
If the valve body swings with respect to the shaft member to press the sealing member against the valve seat, then the sealing performance is improved, but the parallelism between the valve body and valve seat becomes non-constant, forming gaps
Solution Approach 1:
The protruding portion enables the valve body to self-regulate its position and posture during operation. By preventing foreign matter deposition and regulating movement, the system maintains constant parallelism between the valve body and valve seat without requiring external adjustment mechanisms, ensuring consistent sealing performance.
3Reliability
If a double sealing structure with protruding portions is used to improve sealing performance, then foreign matters are scraped off, but excessive pressing stress is still applied to the sealing member, impairing durability
Solution Approach 1:
The valve seat is divided into distinct functional zones: the abutment portion dedicated to sealing contact and the protruding portion dedicated to movement regulation and foreign matter prevention. This segmentation ensures that the sealing member only contacts the abutment portion without excessive stress, while the protruding portion independently handles foreign matter removal through movement regulation.
Data Source
AI summary
A fluid control valve includes: a shaft member that moves along an axis of the shaft by a driving force from a driving source connected to one end of the shaft member; a valve body that is connected to the other end of the shaft member and includes a flat plate shaped main body portion having an outer periphery to which a sealing member is fixed; a housing that includes an inlet and an outlet, has an annular valve seat, and accommodates the shaft member and the valve body, in which the valve body is capable of swinging with respect to the shaft member, the valve seat includes an abutment portion and a protruding portion, and a tip end of the protrusion portion abuts on the main body portion in the state where the sealing member abuts on the abutment portion, so as to regulate movement of the valve body.