Diffuser plates

October 2012 Valves, Actuators & Pump Control

PSV Mitech’s locally manufactured diffuser plates are designed for use with its globe control valve on high pressure drop gas and vapour applications. Installed downstream from the valve, the diffuser plates create a back pressure at the valve. On high pressure drop gas applications, the valve size is selected to maintain the velocity at the outlet within the limit of Mach 0.33. By creating a back pressure, the gas or vapour is more compressed and therefore a smaller valve can be selected while still keeping the velocity within acceptable limits.

Special trims such as low noise or ED disk stack are often still required inside the valve as the downstream plate is not effective at creating back pressure at low flow rates. In these conditions the valve sees the full pressure drop. However the velocity in the smaller valve is still acceptable due to the lower flow rate.

Usually the valve size can be reduced to less than half the size required without the plate, resulting in significant savings, particularly when the sizes involved are large. Several diffuser plates can be installed in series in an expanding pipe work system, or they can be built into a single holder for ease of installation. A typical application for this technology is a steam pressure reducing station.

For more information contact Greg Walker, PSV Mitech, +27 (0)11 657 6000, [email protected], www.mitech.co.za

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