In a steam using plant, steam is often generated at high pressures and reduced locally to provide heat for each steam user. This is usually done to minimize the diameter of steam distribution piping and enable more cost-efficient steam delivery.
A common way of lowering pressure is by throttling down the size of the steam passageway.
For the most basic pressure reduction, it is possible to simply use a conventional globe valve in a fixed partly-open position, or by inserting an orifice plate into the flow of steam. However, any fluctuation in flow rate would be accompanied by a corresponding fluctuation in pressure.
To avoid such circumstances, pressure reducing valves (PRVs) can be used to provide precise control of downstream pressure.
They automatically adjust the amount of valve opening to allow the pressure to remain unchanged even when the flow rate fluctuates.
Sizes: from 1/2" to 6" (DN15 - DN150)
Connections: BSP, NPT, Flanged
Materials: Nodular Iron, Carbon Steel, Stainles Steel, Bronze RG10
Trim: Stainless Steel
Joints & Seals: EPDM, PTFE, NBR, PEEK, EPDM
Medium: neutral gases and Steam
Inlet Pressure (Max): 40 Barg (DN15-50) / 25 Barg (DN65-150)
Outlet Pressure Range: 0,03 to 16 Barg
Kv Range: 3.5 to 240 (m3/h)
Temperature: -40 degC to +250 degC
While it is possible to maintain a constant pressure by using the combination of an actuated control valve, a pressure sensor, and a controller, a pressure reducing valve offers the advantage of being able to control pressure through fully-automatic self-contained operation, requiring no type of external power source.
It can offer the further advantage of extremely rapid response action by immediately sensing and adjusting based on the downstream pressure.