Rotary Valve - The Technical Forum

Posted 06 March 2014 - 09:28

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Regarding the sealing considerations for rotary valves, it is important to note the differences in how flat-front and spherical rotary valves interact with their respective chamber port lips. The key dimension affecting the sealing is along the rotation axis of the rotary valve, which is the distance between the two disks and the width of the combustion chamber. Movement along other dimensions does not impact the sealing as significantly.

Flat-front rotary valves are more forgiving of deformations in the cylinder head. Only the dimension along the rotation axis matters, and significant changes in other dimensions do not affect the sealing. The area between chamber ports acts like an open ring. If the ring diameter increases due to high pressure or temperature, the sealing remains largely unaffected. The pressure in the chamber cannot significantly alter the width of this ring along the rotary valve’s rotation axis.

The lower part of this chamber is enclosed and supported by the cylinder head's lower end. Due to the chamber being small along the rotation axis, the impacts of thermal differences between the chamber walls and the rotary valve are minimal. The combustion chamber’s width is limited by the diameter of the spark plug or injector. For instance, with a 15mm distance between disks, thermal deformation is significantly lower compared to an 80mm bore cylinder with ports on the sides.

Smaller distances between disks result in less thermal and stressing expansion, as well as reduced bending flexing, which are major factors impacting the clearance between flat-fronts and chamber-port-lips.

The valve opening rhythm depends on the shape and geometry of the chamber and intake ports. A trapezoidal valve opening relative to the crankshaft angle is achievable, allowing better breathing since there is no valve stem obstruction. You can adjust the valve-area vs crank angle by selecting the correct port shapes for intake, exhaust, and chamber ports.

The overlap in the PatRoVA is different than in conventional four-valve engines. In four-valve engines, intake and exhaust valves are nearly touching, whereas in the PatRoVA, the opening and closing areas are on opposite sides of the combustion chamber during overlap, aiding in scavenging.

For additional insights on hydraulic systems, read Unlocking the Power of Hydraulic Air Pressure: A Comparison.

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