Significant fluctuations in steam flow can severely damage the pressure reducing valve (PRV), affecting its control accuracy and service life.The main pressure reducing valve product names of China Pressure Reducing Valve Network include:Piston-Type Steam Reducing Valve,Proportional-Type Reducing Valve,Pilot-Type Oversized Diaphragm High Sensitivity Reducing Valve,Large Flow Pilot Piston High Sensitivity Steam Reducing Valve,Low Temperature Reducing Valve,Piston-Type Steam Reducing Valve

1. Problems with Sizing for Maximum Flow

When the load is very low, the main valve operates at a minimal opening for extended periods. This leads to: ① The piston stroke is concentrated in a small area, causing premature and excessive wear, which can result in leakage and seizure; ② At small openings, high-speed wet steam can easily cause wire drawing, erosion, and cavitation on the sealing surfaces, damaging the valve disc and seat. This results in unstable pressure control or even valve failure.

2. Problems with Sizing for Minimum Flow Pressure relief valve

When the load is very high, the valve is undersized and operates at its maximum opening (exceeding 70%) for long periods. This accelerates wear on the piston top and keeps the main valve spring under extreme compression, significantly shortening its lifespan. This ultimately leads to insufficient steam supply, with the downstream pressure falling below the set point. The optimal operating opening range for a PRV is between 30% and 70%.

3. Solution: Parallel PRV Station Pressure relief valveNews

For operating conditions with large flow variations, a parallel station with two PRVs is recommended. For instance, a small valve (e.g., DN20) handles low loads. When demand is high, a larger valve (e.g., DN25, set at a slightly lower pressure) automatically opens to supplement the flow and closes first as the flow decreases. This design ensures each valve operates within its efficient range, minimizing wear. This parallel configuration can also be used for redundant duty (one operating, one standby) in critical processes.

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