Valve sizing software package
April 2001
Valves, Actuators & Pump Control
All control valves should be selected to suit the application if they are to perform well over a long period. A significant proportion of all control valves are oversized and control too close to the seat - leading to poor control and premature failure of the trim.
To assist with sizing and selection of control valves Mitech has made its software available and provides training in its use. Although the program is best used to size the Mitech range of valves it can also be used to do calculations for generic types of valves such as globe, butterfly, rotary plug and ball valves.
The program is Windows-based and is easy to use. The process data can be entered using many choices of units and has the option of converting values from one set of units to another. Once the process information has been entered the program will make a recommendation on the type of valve to be used. Although only a guide this recommendation is valuable to the less experienced user.
Should a globe valve be selected then a complete range of Mitech trims are available to be selected to handle any application from the straightforward to extreme severe service where cavitation is a problem on liquid duties and noise the problem on gases and vapours.
The program calculates the Cv requirement for the application using well-proven ISA formulae. Using this Cv value a suitable size of valve of the chosen type is automatically selected and the velocity at the outlet port calculated. If the velocity exceeds programmed limits then the valve size is increased until an acceptable velocity is achieved. Should reduced trim be available then this will automatically be selected. Where the pressure drop across the valve is high the user has the option of including one, two, or three downstream plates to protect the valve at the maximum flow rate. Facilities exist to assist with the sizing of actuators both for all different types of valves.
Although the program is designed to be user friendly the process of selecting a control valve is an involved process and Mitech recommends that anyone intending to use the program should receive training in its use.
Further information regarding the program and the training course can be obtained by contacting Mitech, (011) 462 2160, [email protected] or www.mitech.co.za
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