Ball Valve Retainer Soldering Paste Seal
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Solution Overview
Problem
Existing methods for sealing threaded valve components fail to maintain a complete seal under high temperature conditions during soldering or brazing processes, leading to potential leakage and damage.
Innovation Solution
Applying a soldering paste with a liquidus of 281° F (138° C) to the external threads of a valve retainer, which liquefies and disperses into the thread spaces upon heating, creating an adhesive seal when the retainer is tightened onto the valve body, ensuring metal-to-metal contact and maximum adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thread sealant or retaining compound is applied to provide secondary protection, then sealing is improved under normal conditions, but the seal fails under high temperature conditions during soldering or brazing processes
Solution Approach 1:
The patent changes the material parameter from organic thread sealant to soldering paste with specific melting characteristics. The soldering paste has a melting point below typical soldering/brazing temperatures, allowing it to remain solid during assembly but liquefy during heating to fill thread gaps and create a heat-resistant seal that maintains integrity under high temperature conditions.
Solution Approach 2:
The patent creates a composite sealing system combining metal-to-metal contact surfaces with soldering paste material. The soldering paste bonds the metal threads together while filling microscopic gaps, creating a composite structure that leverages both the mechanical strength of metal threads and the sealing properties of the soldering paste, resulting in a seal that withstands high temperatures.
2Strength
If torque is increased to achieve metal-to-metal seal, then sealing is improved, but the thread sealant or retaining compound fails under high temperature
Solution Approach 1:
The patent applies soldering paste to the threads before assembly, allowing the paste to be positioned optimally in the thread gaps prior to tightening. During the tightening process and subsequent heating, the paste flows into and fills the thread interfaces, creating a permanent bond that locks the metal-to-metal seal in place, preventing degradation under high temperature conditions.
Solution Approach 2:
The soldering paste acts as an intermediary material between the male and female threads. Rather than relying solely on mechanical friction and compression, the paste creates a metallurgical bond that mediates the connection, distributing stress and maintaining seal integrity even when thermal expansion and contraction occur during high temperature exposure.
3Ease of manufacture
If traditional thread sealant is used, then assembly is simplified, but complete sealing is not achieved under high temperature conditions
Solution Approach 1:
The soldering paste performs multiple functions automatically: it fills thread gaps, creates metallurgical bonds, and forms a heat-resistant seal all during the normal soldering/brazing process. The heating required for end-cap attachment serves dual purposes - both joining the cap and activating the soldering paste seal, eliminating the need for separate sealing operations and achieving complete sealing as a byproduct of the standard manufacturing process.
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 method provides a robust, secure, and complete seal between valve components, preventing leakage and ensuring the integrity of the valve connection even under high temperature conditions.
Implementation Method 1
The retainer is heated to a temperature sufficient to liquefy and disperse the soldering paste into spaces between the threads of the retainer and the threads of the opening in the valve
Implementation Method 2
applying a soldering paste at a predetermined amount around the external threads of a valve component such as a valve retainer such that when heat in an amount normally required to solder or braze the end connection is applied, the soldering paste is liquefied to provide soldering effect, maximum adhesion between body and retainer
Data Source
AI summary
A method of sealing a metal retainer to a metal valve body that includes the steps of applying a soldering paste in a predetermined amount to the threads of a threaded retainer and threading the retainer into the threads of a threaded opening in the valve. The retainer is heated to a temperature sufficient to liquefy and disperse the soldering paste into spaces between the threads of the retainer and the threads of the opening in the valve to thereby achieve an adhesive seal.