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2015 Maxitrol Company. All Rights Reserved. DRAFT 09.18.2013 10 Maxitrols original straight-thru-flow STF design regulators are non-lockup type regulators for high capacities at low inlet pressures. The difference between STF design and other type regulators is the conical valve. The cone principal permits gas to flow straight through the regulator without changing directions. Frictional flow resistance is reduced resulting in greater capacity. An improved flow pattern provides accurate sensitive regulation at extremely low pressure differentials. Typical applications include residential commercial and industrial gas-fired appliances and equipment used on low or medium pressure gas supplies. Pipe Sizes..................................12 to 3 threaded connections with NPT or ISO7-1 threads. 4 150lb. flange RV131 only. Housing Material......................RV52 RV53 RV61 RV81 RV91 RV111 aluminum RV131 cast iron. Mounting..................................RV52 RV53 RV61 are suitable for multi-positional mounting. If ball check vent limiting device is installed mount in an upright position only. RV81 RV91 RV111 RV131 upright position only. NOTE All Maxitrol gas pressure regulators should be installed and operated in accordance with Maxitrol Safety Warning Instructions see GPR_MI_EN.ES or GPR_CSA_MI_EN.FR. Certifications............................RV52 RV53 RV61 RV81 RV91 RV111 ANSI Z21.18CSA6.3 Gas Appliance Pressure Regulators. Gas Types..................................Suitable for natural manufactured mixed gases liquefied petroleum gases and LP gas-air mixtures. Maximum Inlet Pressure...........CSA Certified RV52 RV53 RV61 RV81 RV91 RV111 12 psi 3.4 kPa Maxitrol Tested RV52 RV53 12 psi 3.4 kPa RV61 RV81 RV91 RV111 1 psi 6.9 kPa RV131 2 psi 13.8 kPa Do not use if inlet pressure is more than 10 times desired outlet pressure. Emergency Exposure Limits.......RV52 RV53 3 psi 21 kPa RV61 RV81 RV91 RV111 5 psi 34 kPa RV131 15 psi 103 kPa Gas Containment Limits............RV52 RV53 15 psi 103 kPa RV61 RV81 RV91 RV111 RV131 25 psi 172 kPa NOTE Internal damage may occur when exposed to these pressures. Ambient Temperature Ranges....RV52 RV53 RV61 RV81 RV91 RV111 -40 to 205F -40 to 96C RV131 -40 to 125F -40 to 52C Minimum Regulation.................RV52 RV53 20 CFH RV61 25 CFH RV81 RV91 50 CFH RV111 RV131 250 CFH. Expressed in CFH 0.64 sp gr gas. RV SERIES Straight-Thru-Flow Design RV81 Specifications