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Series 740 ( 3 ⁄4" – 2")Iron Body ASME Rated Water Pressure Relief Valves• For hot water heating boiler pressure protection.• Expanded outlet drain connections.• Size for size, Watts 740 Models offer greater discharge capacity than comparablecompetitive models.2Specifications• NPT threaded female inlet x female outlet (drain) connection.• Sizes 3 ⁄4" x 1" (20 x 25mm), 1" x 1 1 ⁄4" (25 x 32mm), 1 1 ⁄4" x 1 1 ⁄2" (32 x 40mm),1 1 ⁄2" x 2" (40 x 50mm), 2" x 2 1 ⁄2" (50 x 65mm).• Standard pressure relief setting is 30psi (206.9 kPa).• Other settings available in 5psi (34.5 kPa) increments from 30 – 75psi (206.9 – 517.1 kPa).CB740Relief ValvesFor additional information, request literature ES-174A/740.DMODEL SIZE (DN) DIMENSIONS (APPROX.) WEIGHTA B C D Ein. mm in. mm in. mm in. mm in. mm in. mm lbs. kg.740 3⁄4 x 1 20 – 25 3 76 5 7 ⁄8 149 4 3 ⁄8 111 1 1 ⁄2 38 1 7 ⁄8 48 1.9 .9740 1 x 1 1 ⁄4 25 – 32 3 1 ⁄2 89 7 1 ⁄4 184 5 3 ⁄8 137 1 7 ⁄8 48 2 1 ⁄8 54 3.1 1.4740 1 1 ⁄4 x 1 1 ⁄2 32 – 40 4 5 ⁄8 117 8 3 ⁄4 222 6 1 ⁄2 165 2 1 ⁄4 57 2 5 ⁄8 67 6.1 2.8740 1 1 ⁄2 x 2 40 – 50 5 1 ⁄4 133 9 1 ⁄4 235 7 178 2 1 ⁄4 57 3 76 7.5 3.4740 2 x 2 1 ⁄2 50 – 65 6 3 ⁄4 171 11 5 ⁄8 295 8 3 ⁄4 222 2 7 ⁄8 73 3 7 ⁄8 98 16.5 7.5EASafety Relief Valves Settings and Relieving Capacities(National Board Certified Ratings) BTU Steam Discharge Capacities (lbs./hr.)MODEL SIZE (DN) 30PSI 45PSI 50PSI 75PSIin.mm740 3⁄4 x 1 20 x 25 925,000 1,245,000 1,352,000 1,886,000740 1 x 1 3 ⁄4 25 x 32 1,300,000 1,750,000 1,899,000 2,649,000740 1 1 ⁄4 x 1 1 ⁄2 32 x 40 2,105,000 2,830,000 3,075,000 4,285,000740 1 1 ⁄2 x 2 40 x 50 2,900,000 3,903,000 4,237,000 5,909,000740 2 x 2 1 ⁄2 50 x 65 5,250,000 7,067,000 7,672,000 10,700,000Note: Valve settings, other than shown above, are available in 5psi increments within the pressure ranges shown.Contact your local Watts Agent or call Customer Service (978) 689-6066 for the products with a relief setting other than shown and/or specialmodels of interest.Series 315 and 415 ( 3 ⁄4" – 1 1 ⁄2")ASME Rated and Tested Steam Safety Relief Valves• For low pressure steam heating equipment.MODEL SIZE ASME STEAM DIMENSIONS (APPROX.) WEIGHTDischarge Capacity B D Ein lbs./hr. @ 15psi in. mm in. mm in. mm lbs. kg.315-M1 3⁄4 x 3 ⁄4 375 2 11 ⁄16 68 1 3 ⁄8 35 1 1 ⁄4 32 .55 .24415-M1 3⁄4 x 3 ⁄4 450 2 13 ⁄16 71 1 5 ⁄16 33 1 1 ⁄4 32 .70 .31415-M1 1 x 1 643 3 1 ⁄8 78 1 11 ⁄16 43 1 5 ⁄8 41 .91 .41415 1 1 ⁄4 x 1 1 ⁄2 1265 4 3 ⁄4 121 2 3 ⁄8 60 2 1 ⁄8 54 2.00 .91415 1 1 ⁄2 x 2 1860 5 7 ⁄16 138 2 5 ⁄8 67 2 5 ⁄16 59 3.00 1.36B315Specifications• NPT threaded male inlet x threadedfemale outlet (drain) connection.• Standard relief set pressure 15psi(103.4 kPa).• Available with lower pressure reliefsettings, consult factory.• Model 315 – 3 ⁄4" x 3 ⁄4" (20 x 20mm),Model 415 – 3 ⁄4" x 3 ⁄4" (20 x 20mm), 1"x 1" (25 x 25mm), 1 1 ⁄4" x 1 1 ⁄2" (32 x40mm), and 1 1 ⁄2" x 2" (40 x 50mm).For assistance, contact your local authorized Watts agent or visit our website at www.wattsreg.comED21