Leak-Free Reciprocating Valve With Planetary Gear Actuator
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Solution Overview
Problem
Existing magnetic valve actuators face challenges in providing sufficient force to operate valves effectively, especially in high-pressure and harsh environments, leading to potential leakage and safety concerns due to inadequate force transmission and large, costly magnetic couplings.
Innovation Solution
Incorporation of a planetary gear subassembly to magnify the force supplied by the magnetic coupling, allowing for a robust and compact magnetically activated valve actuator that can handle high-force applications by reducing the size and increasing the force of the magnetic coupling, while ensuring leak-free operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a magnetic actuator is designed to provide adequate force to open and close the valve, then the force transmission is sufficient, but the magnet coupling becomes so large as to make it impractical
Solution Approach 1:
A planetary gear mechanism is introduced as an intermediary between the magnetic coupling and the valve stem. The magnetic cartridge rotates the planetary gear carrier, which through gear reduction (3:1 ratio) transmits magnified force to the valve stem while keeping the magnetic coupling size practical and cost-effective
2Volume of moving object
If the size of the magnetic coupling is reduced to make it practical, then the cost decreases, but the force transmitted to the valve stem becomes insufficient
Solution Approach 1:
The planetary gear mechanism serves as a force-magnifying intermediary that allows a smaller, more practical magnetic coupling to generate sufficient force. The gear reduction ratio of 3:1 magnifies the force from the magnetic cartridge three-fold, enabling adequate valve operation force while maintaining a cost-effective magnetic coupling size
3Force
If a mechanical stem actuator is used to provide adequate force, then the force transmission is sufficient, but the dynamic seal around the stem is exposed to leakage risks
Solution Approach 1:
The traditional mechanical stem actuator that penetrates the actuator chamber wall is replaced with a magnetic actuation system. The magnetic cartridge provides force transmission through magnetic fields without mechanical penetration, eliminating the need for a dynamic seal and ensuring complete leak-free operation in hazardous service applications
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 provides a robust and reliable valve actuator capable of operating in harsh conditions, reducing leakage and safety risks, and minimizing the size and cost of the magnetic coupling, effectively addressing the limitations of existing magnetic valve actuators.
Implementation Method 1
the rotational movement supplied by the inner magnetic cartridge is reduced three-fold, while at the same time the force supplied by the inner magnetic cartridge is magnified three-fold
Implementation Method 2
an outer magnetic cartridge that is magnetically coupled to an inner magnetic cartridge
Data Source
AI summary
A valve assembly comprising an adapter plate assembly comprising an adapter plate, a bonnet with a center and a threaded shaft extending through the center of the bonnet; an actuation assembly comprising an outer enclosure and an outer magnetic cartridge that is magnetically coupled to an inner magnetic cartridge; and an inner valve assembly comprising an inner enclosure and a planetary gear subassembly comprising one or more planetary gears.