Pressure Relief Valve (PRV) vs Rupture Disc; What’s the difference?
Both protect your system from overpressure.
But how they do it; and when to use which matters a lot.
A. Pressure Relief Valve (PRV)
1. Is spring-loaded or pilot-operated2.
2. It opens gradually as pressure builds
3. It reseats after relieving pressure
4. It is good for systems needing repeat protection
5. It is commonly used in steam, gas, liquid systems application
7. It allows controlled venting
B.
For Rupture Disc (Bursting Disc)
1. It is one-time use; bursts at set a pressure
2. It is instant, full-area pressure relief
3. It has no moving parts, more like no maintenance
4. It is used where fast, fail-safe relief is critical
5. It is ideal for corrosive, high-pressure, or explosive risk environments
6. It is often used alongside PRVs for extra safety
V. When do use any of them?
1. Use PRV when:
You want a reusable, adjustable, and controlled pressure relief.
2. But use Rupture Disc when:
You want instant protection, simplicity, and zero tolerance for valve failure.
3. Both save systems.
But only when installed right; and for the right reason.
NB: The manometer label you see is actually a pressure gauge; even though manometer is also used to measure pressure.
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