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PRESSURE-REDUCING VALVES

Should steam pressure be too high for a specific process, a self contained pressure-reducing valve (PRV) may be used to reduce this pressure, which will also increase the available latent heat.

These valves may be direct-acting or pilot-operated much like temperature control valves. To maintain set pressure, the downstream pressure must be sensed either through an internal port or an external line.

The amount of pressure drop below the set pressure that causes the valve to react to a load change is called droop. As a general rule, pilot-operated valves have less droop than direct-acting types. To properly size these valves, only the mass flow of steam, the inlet pressure, and the required outlet pressure must be known. Valve line size can be determined by consulting manufacturers’ capacity charts.

Due to their construction, simplicity, accuracy, and ease of installation and maintenance, these valves have been specified for most
steam-reducing stations.

 

 

 
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