Gas Valve Actuator Anti-Corrosion Coating
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Solution Overview
Problem
Gas valve actuators are susceptible to corrosion from hydrogen sulfide in low-quality fuel gas, leading to degradation and failure, especially in the presence of moisture, due to the reaction with copper components.
Innovation Solution
A gas valve actuator design featuring a non-conductive support bobbin with a magnetic flux concentration member and insulated copper wire, coated with an anti-corrosion fluoro-acrylate coating to prevent hydrogen sulfide corrosion, and an armature that aligns with the valve seat for magnetic actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper wire is used in the valve actuator, then electrical conductivity and magnetic performance are improved, but corrosion resistance deteriorates due to reaction with hydrogen sulfide
Solution Approach 1:
A fluoropolymer coating is applied as an intermediary layer between the copper wire and the corrosive hydrogen sulfide environment. This coating acts as a protective barrier that prevents direct contact between the copper and corrosive gases, eliminating the chemical reaction that causes corrosion while allowing the copper wire to maintain its electrical and magnetic functions.
Solution Approach 2:
The valve actuator employs a composite structure combining copper wire for electrical conductivity with a fluoropolymer coating for corrosion resistance. This composite approach integrates the advantageous properties of both materials: the copper provides necessary electrical and magnetic performance while the fluoropolymer layer provides protection against hydrogen sulfide corrosion.
2Reliability
If copper components are exposed to moisture and hydrogen sulfide, then the actuator can perform its magnetic function, but degradation and failure occur due to corrosion
Solution Approach 1:
The fluoropolymer coating serves as a protective intermediary that shields copper components from simultaneous exposure to both moisture and hydrogen sulfide. This barrier prevents the synergistic corrosion effect that occurs when these two contaminants interact with copper, thereby extending the service life of the actuator while maintaining its magnetic functionality.
3Reliability
If a protective coating is applied to the copper wire, then corrosion resistance is improved, but device complexity increases
Solution Approach 1:
A thin fluoropolymer film is applied to the copper wire, providing effective corrosion protection through a simple coating process. This thin-film approach protects against corrosion without significantly increasing the actuator's structural complexity, as the coating integrates seamlessly with the existing wire structure and requires minimal additional manufacturing steps.
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 solution effectively reduces the susceptibility of gas valve actuators to hydrogen sulfide corrosion, ensuring reliable operation even in environments with low-quality fuel gas, by using a non-conductive support bobbin and fluoro-acrylate coating to protect the copper wire from corrosion.
Implementation Method 1
an armature that has a valve seal that is configured to aligned with a valve seat of the gas valve. The armature may be actuated by magnetic attraction to the magnetic flux concentration member when a current is applied through the wound insulated copper wire
Implementation Method 2
an anti-corrosion coating disposed over at least the wound insulated copper wire
Data Source
AI summary
A gas valve actuator for a gas valve. The gas valve actuator includes a non-conductive support bobbin and an insulated copper wire wound about the support bobbin to form a coil. A magnetic flux concentration member extends through the non-conductive support bobbin. To actuate the gas valve actuator, a current is passed through the coil, which produces a magnetic field that actuates an armature to move a valve seal away from a valve seat of the gas valve. Because the gas valve actuator may be exposed to a gas stream, the coil may be coated with an anti-corrosion coating through a spray or brush process, a potting process, through a dipping process, or in any other suitable manner.