Split Valve Seat Structure for Leak-Stable Ball Non-Return Valves
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Solution Overview
Problem
In ball non-return valves used in diaphragm pumps, stress during assembly can cause deformation of the valve seat, leading to leakage and degradation of sealing performance, especially when handling corrosive fluids, as existing materials lack sufficient corrosion resistance and strain absorption.
Innovation Solution
A ball non-return valve design featuring a split valve seat with a first valve seat and a second valve seat, where the second valve seat is cylindrical and sealed by an O-ring, with specific clearances and a tapered surface to prevent strain transmission and maintain sealing performance, and a valve case that allows horizontal movement of the first valve seat to absorb stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single integrated valve seat is used, then device complexity is reduced, but stress during assembly causes deformation and liquid leakage
Solution Approach 1:
The valve seat is segmented into a first valve seat with a ball seal portion and a second valve seat with an O-ring seal portion. This segmentation allows each component to be optimized for its specific function while preventing stress transmission that would cause deformation and leakage.
2Manufacturing precision
If the valve seat is made rigid to maintain sealing surface precision, then manufacturing precision is improved, but the valve seat cannot absorb stress and becomes deformed during assembly
Solution Approach 1:
The rigid second valve seat maintains manufacturing precision for the O-ring seal surface, while the separate first valve seat maintains precision for the ball seal surface. The clearances between components allow stress absorption without compromising the precision of either sealing surface.
Solution Approach 2:
Specific clearances (first clearance and second clearance) are designed between components to allow controlled movement and stress absorption. These parameter changes enable the rigid valve seat components to accommodate assembly stresses without deformation.
Data Source
AI summary
A ball non-return valve that can be integrated with a diaphragm pump or the like, does not transmit strain generated by stress during valve assembly to a ball seal portion, and can stably maintain sealing performance, and a diaphragm pump are disclosed. The non-return valve includes a valve seat having a through-hole, and a ball that opens and closes a flow of a fluid through the through-hole. The valve seat made of a corrosion resistant material is composed of a first valve seat that can support the ball and seal the through-hole, and a second valve seat that has a substantially cylindrical shape surrounding the first valve seat and in which the space between a valve case and the second valve seat is sealed by an O-ring. Clearances d3 and d4 are formed between the first valve seat and the second valve seat, and a horizontal surface of a notched portion of the second valve seat is mounted on an upper surface of a flange portion of the first valve seat.