Liquid & Slurry Solid & Powder Steam & Water SENTRY BPRV BACK PRESSURE Pressure Conditioning SAMPLE CONDITIONING 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 main- tained independent of source pressure fluctuations or sample flow changes. If inlet pressure rises, the regulator opens to let excess flow pass through to drain. This flow is usually used as the grab sample. This unit also acts as a relief valve in the event of an over-pressure condition. When severe service pressure reduction is handled by a Sentry VREL® valve or needle valve, the BPRV only has to control pressure between 20 psig (1.4 barg) and atmo- sphere. This allows precise pressure control, minimizes plugging and ensures high The Sentry BPRV has a much flatter response curve than the standard back pressure valve designed for general process applications. For example, if the set point flow rate is 1200 cc/min, a 25% change in the flow produces only a 0.2 psi (0.014 barg) change in upstream pressure, which is three times more sensitive than a standard back pressure regulator. 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 commonly 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. ■ Designed specifically for power plant sample flow rates ■ Most effective way to assure constant flow through online analyzers ■ Less prone to plugging and sticking than a pressure-reducing valve Will not wire draw or erode in normal Fail-safe relief valve High-Pressure Sample Sample Cooler Pressure Reducing Valve Sentry VREL® -<=~To Analyzer Back Pressure Regulator / Relief Valve Water Flow (cc/min) Sample. Monitor. Measure.

SENTRY BPRV BACK PRESSURE REGULATOR > PRESSURE CONDITIONING > SAMPLE CONDITIONING wetted materials regulated pressure ambient temperature relieving capacity 316 stainless steel and Viton approximately 20 psig (1.4 barg) under normal operating conditions; consult company for other pressure settings 2 gpm at 10 psi (7.6 l/min at 0.7 bar) buildup over set pressure 966 Blue Ribbon Circle North, Oconomowoc, Wl 53066 U.S.A. | +1-262-567-7256 | [email protected] ©2015 Sentry Equipment Corp. All rights reserved. All product and company names are property of their respective owners. It is solely...