Back Pressure Relief Valve (BPRV)

Designed specifically for power plant sample flow, the BPRV provides precise pressure control while minimizing plugging. Regardless of usage, you can assure you are protected from a malfunction and obtain a continuous grab sample.

The Sentry BPRV relief valve holds a constant pressure of approximately 20 psig (1.4 barg) at the analyzer inlet when installed as recommended. This pressure is maintained independent of the source pressure fluctuations or sample flow changes. If inlet pressure rises, the back pressure regulator opens to let excess flow pass through to drain. This flow is usually used as a grab sample. This unit also acts as a reliaf valve in an excessive pressure condition.

In normal operation, there is always a flow from the exhaust port. This flow increases with rising source pressures and decreases with falling source pressures. The BPRV also functions as a fail-safe relief valve, with a relieving capacity exceeding that of the most used 1/4-inch relief valve. Since the BPRV is always in service, a malfunction is immediately evident, while a relief valve can freeze with no outward indication- until it fails to operate in an emergency.