200 mm control valve drops 67 MPa
February 2003
Valves, Actuators & Pump Control
There are only a limited number of mechanisms that can be used to dissipate energy and to drop the pressure gradually so that high velocity/low pressure regions can be avoided, essential if the valve is not going to be severely damaged through cavitation.
The main mechanisms for liquid applications are friction and changes of direction - both of which cause pressure energy to be converted into heat. Mitech uses both of these to maximum effect in its energy dissipating disk stack trim.
One such valve is an angle valve with an ANSI 4500# inlet and an ANSI 300# outlet. According to ASME standards the test pressure for valves is 1,5 times the working pressure - which in this case is 115 MPa (1150 bar). A special seal arrangement in the plug head was developed to create a bubble tight shut-off at this pressure. Although this valve is to be used for testing a pump, the same design would be suitable as a minimum flow bypass valve necessary to protect the pump in normal operation.
For more information contact Hennie Pretorius, Mitech, 011 462 2160, [email protected], www.mitech.co.za
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