That Lift Plug valves are, in some processes, good alternatives for ball or gate valves as they are full bore, pressure tight and do not wear whilst being turned. I know it is hard to determine how pressure tight a valve is in all conditions, but these are said to shut off better than gate valves.1. If you look at the Orbit construction, the first movement away from the seat when opening is actually the 'horizontal' caused by the eccentric placement of the stem in the ball, then afterwards the uplift caused by the threaded stem starts. The Orbit is in my opinion more a ball than a plug valve, 2. The Camflex is mainly a regulating valve but closes and opens double eccentric. It is clearly not a ball valve and neither in my opinion a plug valve, but rather a disc or globe valve. 3. A 'standard - non orbit' double eccentric ball valve will close and open 'horizontally' without lift. 4. A double eccentric plug valve will consist of a segment of a cone or a complete cone but with full opening. All these constructions have eccellent sealing properties, drop thight, given that the operating data: pressure in and out, fluid velocity (flow) fluid properties, temperature and viscosity included, and regulating requirement (if any) all are within what the valve is constructed for. The double eccentric sealing is a sealing with normally far better sealing properties and lifetime than for centric valves of same construction, valid for plug, ball, globe and butterfly and other double eccentric constructions. Conclusion: Cavitation and general lifetime and economical cost/lifetime considerations can only be evaluated, and advice given, if the exact operational data is given and valvetypes to be compared are given. I suspect you are into the smaller sizes rather than the larger (above 24 inch). But what is 'high velocity', pressure and the other fluid and operational details? Some double eccentric ball valves are constructed for more than normal fluid velocity without cavitation if on/off operation.

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