Rising Stem Ball Valve Assembly for Wear and Rotation Control
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Solution Overview
Problem
Ball valve assemblies experience wear and undesirable rotation due to repeated movement and harsh operating conditions, particularly in inaccessible areas, which complicates maintenance and affects their operational reliability.
Innovation Solution
A rising stem ball valve assembly design featuring a guiding member to prevent stem rotation, a lubrication port for reducing wear, and a removable valve seat ring for easy maintenance, along with a twist portion to facilitate rotation and opening/closing of the valve, ensuring reliable operation and reduced wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the stem is allowed to rotate freely during operation, then the valve can be actuated, but the stem experiences undesirable rotation and wear
Solution Approach 1:
The stem is divided into functional segments: a lower portion that rotates with the ball for actuation, and an upper portion that remains stationary or rotates minimally. This segmentation allows the valve to be actuated while preventing undesirable stem rotation and wear in the upper portion.
Solution Approach 2:
A bearing assembly acts as an intermediary between the rotating ball and the stem. The bearing allows the ball to rotate freely for actuation while supporting the stem and preventing it from experiencing undesirable rotation and wear.
2Strength
If the valve seat is permanently attached to the body, then the structure is robust, but maintenance requires complete disassembly
Solution Approach 1:
The valve seat assembly is segmented into a removable seat component and a retained component. The valve seat ring can be independently removed from the valve body through the bonnet, allowing maintenance without complete disassembly while maintaining a robust attached structure during operation.
Solution Approach 2:
The valve seat attachment transitions from a static permanent connection to a dynamic removable connection. The seat can be firmly attached during operation for robustness but can be easily removed when maintenance is needed, providing adaptability between operational and maintenance states.
3Device complexity
If the stem moves vertically without rotation control, then the actuation mechanism is simple, but wear occurs on moving parts
Solution Approach 1:
The bearing assembly serves as an intermediary that guides the stem's vertical movement while preventing unwanted rotation. This allows the simple vertical actuation mechanism to function while the bearing reduces wear on the stem and other moving parts through proper load distribution and motion control.
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 enhances the operational reliability and maintainability of ball valve assemblies by minimizing wear and rotation issues, allowing for efficient fluid handling in harsh environments while enabling frequent maintenance without disassembly.
Implementation Method 1
a lubrication port in fluid communication with the recess
Data Source
AI summary
A ball valve system includes a body having an upstream end and a downstream end and a ball within the body between the upstream end and the downstream end, the ball being rotatable about a vertical axis to move between a closed position and an open position. The ball valve assembly includes a stem movable in an actuation direction substantially parallel to the vertical axis, the stem including a recess at a proximal portion of the stem, a guiding member extending within the recess of the stem, the guiding member being configured to prevent rotation of the stem or cause rotation of the stem, and a lubrication port in fluid communication with the recess.