Ball Valve End Cover Stop for Precise 90-Degree Rod Rotation
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Solution Overview
Problem
The existing ball valve technology faces challenges in restricting the rotation of the valve rod efficiently and cost-effectively, as the installation of limit pins or pieces is complex and costly.
Innovation Solution
A ball valve design that incorporates a limiting member on the inner peripheral wall of the end cover, allowing the valve rod to be limited to a 90-degree rotation through surface-to-surface or line-to-surface contact, with the limiting member's dimensions calculated to ensure precise angle limitation, reducing production costs and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a limit pin or limit piece is attached to the valve rod to constrain rotation, then the rotation angle can be limited to 90 degrees, but the processing cost and material cost increase significantly
Solution Approach 1:
The patent merges the limiting function into the valve seat structure by adding a boss with a limiting groove, eliminating the need for separate limit pins or limit pieces. The limiting groove is directly formed on the boss, integrating multiple functions into a single component and reducing both material and processing costs.
Solution Approach 2:
The patent extracts the limiting function from the valve rod and relocates it to the valve seat's boss structure. Instead of modifying the valve rod with expensive limit pieces, the limitation is achieved through the boss's geometric features (limiting groove), simplifying the valve rod while maintaining the 90-degree rotation constraint.
2Reliability
If a limit pin or limit piece is installed on the valve rod to restrict rotation, then the ball valve can function as an on-off valve with 90-degree rotation, but the installation becomes challenging and costly
Solution Approach 1:
The limiting function is merged into the valve seat assembly through the boss and limiting groove structure. This integration eliminates separate limit pins and their complex installation procedures, while maintaining reliable 90-degree rotation constraint through the geometric interfit between the limiting groove and the valve rod's limiting protrusion.
3Manufacturing precision
If traditional limit pins or limit pieces are used to constrain valve rod rotation, then the rotation angle is controlled, but the material cost increases due to additional components
Solution Approach 1:
The patent combines the limiting function with the existing valve seat and boss structures, eliminating the need for additional limit pins or limit pieces. The limiting groove is formed as an integral part of the boss, reducing material consumption and component quantity while maintaining precise 90-degree rotation control.
Data Source
AI summary
A ball valve is provided. The ball valve includes a valve body, an end cover and a valve rod. The end cover is installed on the valve body, and one end of the valve rod is rotatably installed in the valve body, the other end of the valve rod extends out of the valve body through the end cover. A limiting member is arranged on an inner peripheral wall of the end cover, and the valve rod is capable of being limited by the limiting member to allow a maximum rotating angle of the valve rod in the end cover to be 90 degrees.