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When pressure drops ratio (x=¦¤P/P1) reaches some values close to 0.5 there will be sonic conditions with the associated vibration and noise, in gas or steam applications.
In liquid service, when downstream pressure approaches vapour pressure at fluid temperature, cavitation will appear, with noise increase and damage to the valve components. This will happen whenever the cavitation index xF=(P1-P2)/ ¦¤P reaches the valve FL2 value.
Our approach to both problems, either gases (sonic conditions) or liquids (cavitation), is based on the ¡°source treatment¡±principle: this is to suppress the source of the problem, which is the high pressure drop.
With our multicylinder cage the fluid goes through a stepped pressure reduction process, the number of steps being as large as necessary to keep pressure drop under critical values.
We have the technology to calculate, design and manufacture the valve internals best suited for every set of conditions. We calculate, for every particular application,
-the number of steps necessary to avoid critical conditions at any stage,
-the partial pressure drops at every stage,
-the Cv value of every cylinder
to achieve a non critical pressure profile.
This is equivalent to say that xT and Fl values of every valve will be as high as required by the given conditions.
In small Cv, small size valves, the same results are obtained by our Multistep design.


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