Reversible Ball Valve Handle and Stem Sealing Without Shutdown
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Solution Overview
Problem
Traditional ball valves face issues with fluid leaks due to the connection between the stem and housing, requiring continuous adjustments and replacements, and are difficult to reposition without shutting down the system, especially when the handle needs to be reversed.
Innovation Solution
The design includes a valve body with a stem opening and handle stop openings, a valve stem with seal grooves and a packing nut that compresses to create seals, and a reversible handle with shoulders for 90° rotation, along with a locking plate to prevent accidental rotation, allowing for easy adjustment, locking, and sealing without system shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compression packing is used to seal the stem connection, then sealing function is improved, but continuous adjustment and replacement are required due to leaks
Solution Approach 1:
The patent extracts the sealing function from the traditional compression packing system and implements it through elastomeric seals integrated into the stem seal groove. This eliminates the need for external packing nuts and continuous adjustments, as the elastomeric seals provide reliable sealing without requiring maintenance during the valve's service life.
Solution Approach 2:
The patent changes the sealing mechanism from mechanical compression (packing) to elastic deformation (elastomeric seals). The elastomeric material properties allow the seal to maintain contact pressure and sealing effectiveness throughout the valve's operational life without requiring adjustment, thereby improving reliability and reducing maintenance.
2Adaptability or versatility
If handle repositioning is required to alter flow direction or accommodate limited space, then adaptability is improved, but system shutdown and depressurization are required
Solution Approach 1:
The patent segments the handle assembly from the valve body by introducing a removable coupling mechanism. This allows the handle to be detached and repositioned independently without affecting the sealed valve body, enabling handle repositioning while the valve remains installed and pressurized, thus maintaining system availability.
Solution Approach 2:
The patent introduces a coupling mechanism as an intermediary between the handle and valve stem. This intermediary allows the handle to be removed and reinstalled in different positions without requiring system shutdown, as the coupling can be quickly disconnected and reconnected while maintaining the sealed integrity of the valve body.
3Strength
If traditional locking members are used to secure the stem, then stem retention is improved, but packing adjustment becomes difficult when handle is coupled or locked
Solution Approach 1:
The patent extracts the packing adjustment mechanism from the traditional small packing nut design and replaces it with a large hexagonal packing nut that provides adequate wrench clearance. This allows packing adjustments to be performed easily even when the handle is coupled to or locked on the valve stem, eliminating the accessibility problem of traditional packing nuts.
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
This design enhances the sealing efficiency between the stem and valve body, allows for easy handle repositioning without system shutdown, and maintains fluid isolation with reduced need for continuous adjustments and replacements.
Implementation Method 1
The packing compresses when the packing nut is coupled to the threaded exterior surface of the stem opening on the valve body
Implementation Method 2
Elastomeric seals are located in the plurality of seal grooves on the stem to contact the generally cylindrical interior surface of the stem opening
Data Source
AI summary
An isolation valve has a reversible handle and multiple seals between the valve stem and valve housing. The handle includes a portion that engages a handle stop that is attached to the valve body. When the handle is reversed, the stop is moved to another handle stop opening in the valve body. Thus, the handle direction can be reversed without removal of the handle. A locking plate may be used with the isolation valve. The locking plate includes portions that engage a lock and the handle stop. When the handle direction is reversed, the locking plate can be rotated around the stem to engage the repositioned handle stop.