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Designing axial-motion valves

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Prometheus21

Mechanical
Apr 22, 2023
103
NO
Hi all,

So back in the day one could say that many common valve geometries had never been analyzed mathematically, and if they had, they were not readily available in design handbooks. This lack of analysis forced engineers to use graphical techniques to relate flow area to the separation between valve elements. Valve geometries of interest in my case is:

1. Radiused seat and radiused piston.
2. Tapered seat and radiused piston.
3. Radiused seat and tapered piston.

Where sharp-edged seats and pistons can be included by considering sharp edges to have a radius of 0.

Does any design recommendations; handbooks, tech briefs ect. exist, that you know of, that covers this topic?

This is to be used for needle and poppet valve design, and I need to consider the throttling area, as it is required to determine the flow through a line restriction. Yes, for a simple sharp-edged orifice the throttling area is simply the area of a circle. But for the needle and poppet valves the throttling area is not so easy to determine.

Thank you for any input you may have.
 
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You are correct that for needle and seat valves the flow area geometry is complex. Depending on the geometry, you may actually find two local minimum flow areas, and can even find a hysteresis in the flow curve as a result (ie which area dominates depends on which direction the valve is operated).
 
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