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<p><font FACE="Arial"><big>Gas</big></font></p>

<p><u><font FACE="Arial" size="3">Calculation conditions:</font></u></p>

<p><font FACE="Arial" size="2">Medium must be in a state of gas with pressure from 0.001
to 1000 MPa in absolute value. Turbulent flowing, isothermic throttling is supposed to
occur.<br>
When calculating valve´s output for gas, first you must select an appropriate gas from
database (it is executed in &quot;Medium&quot; pull-down menu in the middle of panel). If
required gas is not saved in the table, it may be added in there (see. Updating service
and data tables utilization). After this, calculation can be even executed.<br>
Following data must be entered for calculation of valve´s Kvs value:<br>
&nbsp;&nbsp;&nbsp; Inlet pressure p1<br>
&nbsp;&nbsp;&nbsp; Outlet pressure p2<br>
&nbsp;&nbsp;&nbsp; Flow Q (when p1; t or when 0 °C; 0.1 MPa)<br>
&nbsp;&nbsp;&nbsp; Medium temperature t<br>
These input data can be entered simulatneously for three states the calculated valve may
be destined for - e.g. for minimal, nominal and maximal flow rate. Calculation will be
executed after clicking on &quot;OK&quot; frame on the upper part of panel. An optimal Kvs
value is finally selected for state in which calculated Kv value is maximal. But user may
change the final Kvs value.<br>
<br>
Further, an optimal inner DN value of piping must be selected. This DN value must be
selected with respect to the speed of medium flowing inside piping. This speed for
actually selected DN is showen on the screen. There is a principle that outlet DN must be
equal to or higher than inlet DN.</font></p>
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