Pressure Relief Valve vs. Pressure Reducing Valve: Key Differences

 

Introduction



Pressure control is crucial in Udhhyog (industry) to maintain safe and efficient operations. Pressure Relief Valves (PRVs) and Pressure Reducing Valves (PRDVs) serve different purposes in piping systems. This guide explains their differences, functions, and applications.

What is a Pressure Relief Valve (PRV)?

A PRV automatically releases excess pressure from a system to prevent overpressure damage.

Key Functions:

  • Prevents system failure by venting excess pressure.

  • Protects equipment from damage due to high pressure.

  • Activates automatically when pressure exceeds the set limit.

Common Applications:

  • Boilers

  • Air compressors

  • Oil & gas pipelines

  • Chemical processing plants

What is a Pressure Reducing Valve (PRDV)?

A PRDV regulates and maintains downstream pressure at a preset level.

Key Functions:

  • Reduces high inlet pressure to a safe, usable level.

  • Ensures consistent pressure for downstream equipment.

  • Improves efficiency in industrial and domestic applications.

Common Applications:

  • Water distribution systems

  • Steam heating systems

  • HVAC units

  • Industrial gas networks

Key Differences: PRV vs. PRDV

FeaturePressure Relief Valve (PRV)Pressure Reducing Valve (PRDV)
FunctionReleases excess pressureRegulates pressure to a set level
Activation MethodOpens when pressure exceeds limitAdjusts flow to control pressure
Flow DirectionDischarges pressure externallyControls internal system pressure
ApplicationsBoilers, pipelines, safety systemsWater, gas, and steam distribution
Operation TypeReactive (opens when needed)Proactive (always regulates)

Working Mechanism of PRV vs. PRDV

How a Pressure Relief Valve Works:

  1. Detects overpressure in the system.

  2. Opens automatically to release excess fluid/gas.

  3. Closes once pressure stabilizes.

How a Pressure Reducing Valve Works:

  1. Reduces inlet pressure to maintain safe output pressure.

  2. Uses a spring-loaded diaphragm to adjust flow.

  3. Maintains consistent downstream pressure regardless of fluctuations.

When to Use a PRV or PRDV?

  • Use a PRV when protecting equipment from overpressure damage.

  • Use a PRDV when controlling pressure for efficient system operation.

Common Issues & Troubleshooting

IssuePossible CauseSolution
PRV leakingWorn-out sealsReplace seals
PRDV not reducing pressureFaulty diaphragmReplace or adjust spring
Excessive noiseValve too smallUse properly sized valve
PRV constantly openHigh inlet pressureAdjust pressure setting

Maintenance Tips

  1. Inspect PRVs & PRDVs regularly for wear and tear.

  2. Clean internal components to prevent clogging.

  3. Test valve operation annually for safety.

  4. Replace faulty seals to maintain efficiency.

  5. Ensure proper calibration for optimal performance.

FAQs

1. Can a pressure relief valve be used as a pressure reducing valve?

No, PRVs release excess pressure, while PRDVs control pressure within a system.

2. How do I know if I need a PRV or PRDV?

Use a PRV for safety and PRDV for pressure regulation.

3. What happens if a PRDV fails?

If a PRDV fails, downstream pressure may rise, leading to equipment damage.

4. Do PRVs and PRDVs require maintenance?

Yes, regular inspection, cleaning, and calibration are necessary.

5. Where can I buy high-quality PRVs and PRDVs?

Leading suppliers are available on TradeIndia, Justdial, and IndiaMART.

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