Affiliation:
1. UPC Terrassa Department de Mecànica de Fluids Spain
2. Cardiff University Cardiff School of Engineering Cardiff, Wales, UK
Abstract
A new set of equations is developed, giving insight into the flow and pressure distribution across poppet valves with large cone-shaped seats. The equations apply for laminar flow, which appears when the length of the seat is much greater than the valve opening gap, and are a useful design tool for applications where a linear pressure/flow characteristic could be a distinct control advantage. The momentum equation is also applied to determine the static forces on the conical spool and it is confirmed that, for small chamfered-type seats, momentum forces can still play a decisive role on the total force. However, as the length of the seat increases to a cone type the dominant role is then played by the pressure forces acting on the seat, producing a much more predictable valve characteristic. The new equations allow accurate design of the seat length to minimize this static force variation. In order to validate the equations developed, a three-dimensional computational fluid dynamics (CFD) analysis of the flow along the valve seat has been performed and a test rig was designed to check experimentally the pressure distribution and flow along such a valve. Very good agreement has been obtained between experimental, CFD and theoretical pressure/flow results.
Subject
Mechanical Engineering,Control and Systems Engineering
Cited by
3 articles.
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3. Flow model and dynamic characteristics of a direct spring loaded poppet relief valve;Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science;2017-05-02