Inlet Control Valve Vapor Liquid Separation Marine Fuel Systems
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Solution Overview
Problem
Fuel delivery systems in marine crafts face issues with fuel vapors carrying liquid fuel through filler tubes during filling operations, leading to spillage and non-compliance with evaporative emissions regulations due to venting of diurnal emissions.
Innovation Solution
The implementation of an enhanced inlet control valve with a multi-piece snap-fit valve body and flow control apparatus that prevents liquid fuel from flowing during overfilling while allowing vapor venting, and includes a vapor collection system to reduce diurnal emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If venting means are included to release fuel vapors during filling operations, then fuel vapor venting is enabled, but liquid fuel spillage occurs when vapors carry liquid fuel through the filler tube
Solution Approach 1:
The inlet control valve incorporates a screen or filter element with specific pore sizes that allows vapor molecules to pass through while blocking larger liquid fuel droplets. This local quality differentiation at the valve component level enables selective flow based on the physical state of the fuel, resolving the contradiction between vapor venting and spillage prevention.
Solution Approach 2:
The inlet control valve acts as an intermediary device positioned between the filler tube and fuel tank. It mediates the flow of fuel-vapor mixtures by allowing vapor passage while intercepting and retaining liquid fuel, thus preventing spillage while maintaining vapor venting functionality.
2Stress or pressure
If venting means are provided for fuel vapor discharge, then fuel tank pressure relief is achieved, but diurnal evaporative emissions are released to the atmosphere
Solution Approach 1:
The inlet control valve provides dynamic flow control that adapts to different operating conditions. During diurnal cycles when no filling occurs, the valve's screen structure allows vapor escape for pressure relief. During active filling operations, the valve can be configured to restrict emissions while maintaining necessary venting, thus dynamically adjusting to different operational states.
Solution Approach 2:
The valve design incorporates parameters such as screen pore size, valve opening degree, and flow resistance that can be adjusted or selected based on operational requirements. By changing these parameters, the system can optimize between pressure relief and emissions control for different operating conditions including diurnal cycles and active filling.
Data Source
AI summary
Inlet control valves for use with fuel delivery systems are described. An example inlet control valve includes a first body portion having a first coupling to define an inlet of the control valve and one of a plurality of fasteners or a plurality of slots opposite the inlet. A second body portion coupled to the first body portion to define a fluid flow passageway, where the second body portion has a second coupling to define an outlet of the control valve and the other one of the plurality of fasteners or the plurality of slots opposite the outlet. The first plurality of slots receives the first plurality of fasteners when the first body portion is coupled to the second body portion. A valve is pivotally coupled relative to the first and second body portions to control fluid flow through the passageway.