Flap Gates Backflow prevention in free discharge applications
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- Horace Hoover
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1 Flap Gates Backflow prevention in free discharge applications
2 A Proud Tradition Since 1840, the team at Rodney Hunt has pioneered safe and reliable flow control systems to help communities and owners control the transmission, distribution, and reclamation of water and wastewater. Superior Quality We offer one of the most flexible and comprehensive metal fabrication, machining, and testing operations in North America. This allows us to monitor and ensure quality in all aspects of production. We are ISO9001:2008 certified. Experience Our total product offering is unrivaled in the flow control marketplace, and this enables us to bring an impressive range of expertise to your planning and decisionmaking process. We re specialists in flow control. Our products make it easier for municipalities, engineering firms, and contractors to bring their water management projects in ontime, onbudget, and troublefree. Responsive Service We pride ourselves on responding to your needs throughout the design, manufacturing, and installation processes. Our engineering team is available for consultation during all phases of your project. Dedicated project managers serve as a single point of contact once the order is inhouse, and our knowledgeable field service team is always ready to provide onsite support. 2 Two 60 (1500mm) Series 60 Flap Gates help protect a North Dakota watershed from forward and reverse surges.
3 Flap Gates Backflow prevention in free discharge applications Rodney Hunt (or flap valves) are designed as an efficient backflow prevention solution in almost any free discharge application. Several Flap Gate types and configurations are available to meet different field mounting requirements, including water, wastewater, and seawater. UHMWPE Bushings Bearing arm Adjustable Hinge Bearings Frame Flap Seal EPDM gasket Flap Flap Seal Retainer Ring Gravity Operated Minimal water pressure is needed for operation. Flap opens when the head in the pipe or conduit exceeds 0.2 feet (0.6m) above the head in the receiving body of water. Flap closes when the head in the receiving body of water exceeds the head in the pipe or conduit. Low headloss when fully open. Cast or Fabricated Depending on application, installation, and preferences, Flap Gates are available in high strength stainless steel (ASTM A0 Type 304L or 316L) or cast iron (A126 Class B). Circular, Square, and Rectangular Designs Choose from a wide range of sizes and configurations for openings 4 to 144 and greater. Low Leakage Cast iron to resilient or bronzetobronze seating is available on cast iron Flap Gates, and resilient to stainless steel seating on fabricated Flap Gates. Both provide a tight seal for low leakage when closed. Low Maintenance All Flap Gate models offer high corrosion resistance, low maintenance, and a variety of mounting options. Flexible Flap Options A stainless steel frame with neoprene flap provides quiet operation, and can be custom sized for any application up to 48 (1200mm) wide. For wider openings, two or more can be bonded and clamped. ISO 9001:2008 3
4 Series FVSPR Low cost backflow prevention Cast Iron with stainless steel pivot hardware Resilient seated Single Pivot 4 30 (100mm 750mm) Series FVAC and FVACP Engineered for high seating heads Designed to handle forward and reverse pump surges (Series ACP) Spring bumper limits disc travel to 90º (Series ACP) Antilocking bar eliminates flap overturn damage Cast Iron with stainless steel pivot hardware Cast iron to resilient or bronze seating Adjustable double pivot design 4 96 (100mm 00mm) Series FVAR For rectangular or square openings Cast iron to resilient or bronzetobronze seating Double pivot design 12 x 12 to 144 x 144 (300mm x 300mm 50mm x 50mm) Custom designed for specific head conditions Series FG60 Circular fabricated stainless steel Resilient to stainless steel seating Hinges feature UHMWPE selflubricating bushings Wall or pipemounted 6 96 (150mm 00mm) 4
5 Series FR40 For rectangular or square openings Fabricated stainless steel Neoprene to stainless steel seating Hinges feature UHMWPE selflubricating bushings 12 to 96 (300mm 00mm) Custom designed for specific head conditions Flexible Flap Gate For quiet operation Opens under very low unseating head Withstands slamming action of pump discharge and wave action Stainless steel frame with flexible reinforced neoprene flap Neoprene to neoprene seating for low leakage Custom sized for application Projects Rodney Hunt Flap Gates are designed for use in a wide variety of free discharge applications. Our gates can be found in water and sewage treatment plants, drainage and irrigation canals, pump stations, water distribution systems and more. Contact us today about your next project at or find your local rep at US 90A Pipeline, Fort Bend, TX Thirteen 108 (2743mm) Flap Gates with bronze seats Ally CreekEast River, Queens, NY Four 120 x 90 (3050mm x 2290mm) Flap Gates with neoprene resilient seats 5
6 Series FVSPR B A E C=No. of mounting holes D=Diameter of mounting holes Dimensions Gate Size inches A B C D E (mm) /8 8 3/4 71/2 (100) (229) (264) (19) (191) /8 8 7/8 91/2 (150) (279) (314) (22) (1) 8 131/2 143/8 8 7/8 113/4 (200) (343) (5) (22) (298) / /4 (250) (406) (416) (25) (2) / (300) (457) (467) (25) (432) / /8 183/4 (350) (533) (518) (29) (476) /2 223/ /8 211/4 (400) (597) (568) (29) (540) / /4 223/4 (450) (635) (619) (32) (578) /2 263/ /4 25 (500) (699) (670) (32) (635) / /8 291/2 (600) (813) (772) (35) (749) Standard Materials Part Material Flap Cover Cast Iron (A126 Class B) Cover Seat Facing Iron (A126 Class B) Body Cast Iron (A 126 Class B) Body Seat Facing Neoprene (D2000) Hinge Pins Stainless Steel (A276304) Hinge Pin Washers Stainless Steel (A276304) Cotter Pins Bronze (B98C655) Note: Specifications available at 6
7 Series FVAC and Series FVACP Dimensions A = Diameter inches (mm) B C D E F G /16 3/4 81/2 8 23/4 (100) (229) (141) (19) (216) (203) (70) /16 3/4 81/4 9 23/4 (150) (279) (141) (19) (210) (229) (70) 8 131/2 63/4 3/4 91/4 111/4 3 (200) (343) (171) (19) (235) (286) (76) /4 7/8 111/8 131/2 3 (250) (406) (210) (22) (283) (343) (76) / /2 161/4 3 (300) (483) (8) (25) (343) (413) (76) /8 151/2 191/2 31/4 (350) (533) (305) (29) (394) (495) (83) /2 123/4 11/8 171/8 211/4 31/4 (400) (597) (3) (29) (435) (540) (83) /2 11/4 185/8 31/2 (450) (635) (8) (32) (473) (610) (89) /2 16 1/8 11/4 177/8 26 1/2 5 (500) (699) (410) (32) (454) (673) (127) /2 13/8 223/4 313/4 51/2 (600) (813) (495) (35) (578) (806) (140) /4 11/2 285/8 391/2 6 (750) (984) (610) (38) (727) (1003) (152) /2 15/8 323/ /2 (900) (1168) (7) (41) (832) (1190) (165) /4 1/2 541/2 7 (1075) (1346) (838) (44) (927) (1380) (178) / / /2 (1200) (1511) (978) (1054) (1575) (1570) (191) /4 421/2 21/4 463/4 691/2 81/2 (1375) (1683) (1080) (57) (1187) (1770) (216) / /4 81/2 (1500) (1854) (1194) (57) (1321) (1960) (216) /2 21/4 551/2 851/4 81/2 (1650) (2007) (1308) (57) (1410) (2170) (216) /2 541/8 21/2 923/4 81/2 (1800) (2197) (1375) (64) (20) (216) /8 601/2 21/2 1001/2 81/2 (1950) (25) (1537) (64) (2550) (216) /4 651/4 25/ /2 (2100) (2534) (1657) (67) (2740) (1) /4 741/2 23/ /2 (00) (2877) (1892) (70) (3120) (1) /2 831/ /8 (2745) (3264) (2121) (76) (4505) (276) NOTE: Mounting flange drilled to match 25 lb. or 125 lb. drilling. D=thickness of mounting flange. G E C F A B D Standard Materials Part Material Flap Cover Cast Iron (A126 Class B) Cover Seat Facing Iron (A126 Class B) or Bronze (B21464) Body Cast Iron (A 126 Class B) Body Seat Facing Neoprene (D2000) or Bronze (B21464) Hinge Arms Bronze (B584C865) Hinge Pins Stainless Steel (A276304) Hinge Pin Washers Stainless Steel (A276304) Cotter Pins Bronze (B98C655) AntiLocking Bar Steel (A108 C1018) Bumper Spring Heattreated spring steel (A689) Note: Specifications available at E 7
8 Series FVAR Dimensions WIDTH x HEIGHT inches (mm) A B C D E F 12x /4 91/2 73/ /4 (300x300) (483) (489) (1) (197) (25) (476) 18x /2 111/16 11/4 1/2 (450x450) (635) (686) (318) (281) (32) (622) x / /16 13/8 323/4 (600x600) (813) (902) (406) (370) (35) (832) 30x /16 15/8 401/2 (750x750) (914) (1092) (483) (459) (41) (1029) x / /2 323/4 (900x600) (1143) (914) (470) (533) (38) (832) x /2 211/4 15/8 47 (900x900) (1143) (1295) (572) (540) (41) (1194) x /4 283/4 211/ (900x1200) (1143) (1695) (730) (540) (51) (1765) x / /2 21/4 691/2 (900x1375) (1168) (1842) (813) (546) (57) (1765) 42x42 511/2 583/4 253/4 1/4 13/4 541/2 (1075x1075) (1308) (1492) (654) (616) (44) (1384) 48x /16 15/8 1/2 (1200x450) (1422) (711) (330) (681) (41) (622) 48x / /16 15/8 323/4 (1200x600) (1422) (902) (406) (681) (41) (832) 48x /16 15/8 401/2 (1200x750) (1422) (1092) (483) (687) (41) (1029) 48x /2 271/16 15/8 47 (1200x900) (1422) (1295) (572) (687) (41) (1194) 48x48 571/2 663/4 283/4 271/ (1200x1200) (1461) (1695) (730) (699) (51) (1575) 48x60 571/2 813/4 343/4 271/2 21/4 773/4 (1200x1500) (1461) (2076) (883) (699) (57) (1975) 54x / /2 21/4 691/2 (1375x1375) (1626) (1892) (813) (775) (57) (1765) 60x 691/2 511/4 223/4 331/4 13/4 47 (1500x900) (1765) (1302) (578) (845) (44) (1194) 60x48 691/2 663/4 283/4 331/2 21/4 62 (1500x1200) (1765) (1695) (730) (851) (57) (1575) 60x60 691/2 813/4 343/4 331/2 21/4 773/4 (1500x1500) (1765) (2076) (883) (851) (57) (1975) 60x72 691/2 951/2 411/2 331/2 21/4 933/4 (1500x1800) (1765) (26) (1054) (851) (57) (2381) 72x48 811/2 643/4 283/4 391/2 21/4 62 (1800x1200) (2070) (1645) (730) (1003) (57) (1575) 72x /2 351/2 391/2 21/4 773/4 (1800x1500) (2108) (2096) (902) (1003) (57) (1975) 72x /2 411/2 401/4 21/2 933/4 (1800x1800) (2108) (26) (1054) (1022) (64) (2381) 84x /2 471/2 461/2 23/4 1073/4 (2100x2100) (13) (2858) (1207) (1181) (70) (2737) 96x /2 531/2 521/2 23/4 1233/4 (00x00) (2718) (3162) (1359) (1334) (70) (3143) F E Standard Materials Part B height D Material width Flap Cover Cast Iron (A126 Class B) Cover Seat Facing Cast Iron (A126 Class B) or Bronze (B21464) Body Cast Iron (A 126 Class B) Body Seat Facing Hinge Arms Hinge Pins Hinge Pin Washers Cotter Pins A Neoprene (D2000) or Bronze (B21464) Bronze (B584C865) Stainless Steel (A276304) Stainless Steel (A276304) Bronze (B98C655) Note: Specifications available at D C 8
9 9 Series FG60 Part Material Body, Cover, Hinges, Hinge Arm Stainless steel (ASTM A0 Type 304L or 316L) Hinge Bushings UHMWPE (ASTM D4020) Seal for Flaps Up to (610 mm) Neoprene (ASTM D2000 Grade 2 BC510) Over 0 (610 mm) EPDM (ASTM D2000) Fasteners Stainless STeel (ASTM F593 and F594, GR1 for Type 304 and GR2 for Type 316) Standard Materials Dimensions Note: Specifications available at B E 6 (150) 11 (277) 17 (430) 15 (379) 18 (455) 37/16 (85) 91/3 (239) 15 (379) 91/2 (239) 12 (303) 15 (379) 8 (201) 8 (200) 131/2 (340) 3/4 ( /8 ( (429) 201/8 (508) 253/4 (651) 59/16 (138) 113/4 (295) 223/4 (575) 171/8 (432) 113/4 (295) 14 (353) 171/8 (432) 223/4 (575) 1115/32 (288) 10 (250) 16 (402) 263/4 (675) 211/8 (533) 19 (479) 221/8 (558) 273/4 (701) 65/8 (164) 141/4 (358) 3/4 (625) 191/8 (482) 141/4 (358) 16 (402) 191/8 (482) 3/4 (625) 137/16 (337) 12 (300) 20 (503) 261/2 (668) 231/4 (586) 21 (528) 1/4 (611) 271/2 (694) 8 (198) 17 (427) 1/2 (617) 211/4 (535) 17 (427) 18 (452) 211/4 (535) 1/2 (617) 15 (376) 15 (381) 23 (584) 291/2 (749) 263/8 (670) (600) 273/8 (695) 301/2 (775) 91/2 (1) 21 (533) 271/2 (699) 3/8 (619) 21 (533) 3/8 (619) 271/2 (450) 18 (699) 18 (450) 26 (653) 33 ( /2 (742) 27 (679) 301/2 (768) 34 (857) 107/8 (269) (603) 31 (780) 271/2 (692) 223/4 (571) (603) 271/2 (692) 31 (780) 223/4 (571) 21 (533) 29 (737) 1/2 (927) 355/8 (905) 30 (750) 335/8 (854) 271/2 (699) 13 (330) 27 (686) 341/2 (876) 305/8 (778) 27 (686) 305/8 (778) 341/2 (876) 1/2 (622) (600) 32 (803) 391/2 (993) (904) 33 (828) 37 (930) 401/2 (1019) 14 (346) 30 (752) 371/2 (943) 34 (854) 291/2 (739) 30 (752) 34 (854) 371/2 (943) 271/8 (679) 30 (800) 383/4 (1022) 471/2 (15) 42 (1105) 39 (1029) 43 (1130) 481/2 (1270) 231/4 (629) (952) 451/2 (1194) 40 (1054) (952) (952) 40 (1054) 451/2 (1194) 401/2 (1060) (900) 46 (1154) 551/2 (1396) 481/2 (1218) 45 (1129) 491/2 (13) 561/2 (653) 261/4 (653) 423/4 (1072) 531/2 (1345) 461/2 (1167) 423/4 (1072) 42 (1053) 461/2 (1167) 531/2 (15) 461/4 (1161) 42 (1000) 53 (1279) 621/2 (1521) 541/2 (1217) 51 (1228) 551/2 (1343) 631/2 (1546) 291/4 (676) 491/2 (1190) 601/2 (1470) 521/2 (1267) 491/2 (1190) 48 (1152) 521/2 (1267) 601/2 (1470) 521/4 (1260) 48 (1200) 591/2 (1491) 721/2 (1822) 627/8 (1577) 59 (1479) 637/8 (1602) 721/2 (1822) 321/2 (806) 56 (1402) 691/2 (1745) 607/8 (1526) 56 (1402) 56 (1402) 607/8 (1526) 691/2 (1745) 581/2 (1466) 54 (1400) 661/4 ( /2 (2022) 691/8 (1784) 65 (1679) 701/8 (1809) 791/2 (2047) 357/8 (939) 62 (1603) 761/2 (1971) 671/8 (1733) 623/4 (1622) 62 (1603) 671/8 (1733) 761/2 (1971) 641/2 (1666) 60 (1500) 73 ( /2 (2148) 71 (1779) 861/2 (2173) 35 (865) 68 (1703) 831/2 (2097) 691/4 (1735) 68 (1703) 831/2 (2097) 671/2 (1691) 72 (1800) 861/2 (2168) 98 (60) 83 (2079) 99 (86) 401/4 (993) 80 (2003) 96 (09) 821/2 (2067) 80 (2003) 96 (09) 781/2 (1965) 84 (2100) 993/4 (2500) 1131/2 (2849) 95 (2379) 1141/2 (2874) 501/2 (19) 92 (2303) 1111/2 (2798) 951/2 (2392) 92 (2303) 1111/2 (2798) 941/2 (26) 96 (2500) 106 (2754) 129 (3339) 107 (2780) 130 (34) 563/4 (1503) 104 ( (3262) 1081/2 (2818) 104 (2704) 126 (3262) 1071/16 (2781) A C Gate size diameter (in/mm) CW, WT, SF CWX RCP CWX RM RMX DIP RMX RCP RMX DIP RMX RCP CW, WT CWX RCP CWX SF RM
10 Series FR40 Dimensions Gate size diameter Inches (mm) 12 x 12 (300 x 300) 16 x 16 (400 x 400) 18 x 18 (450 x 450) 21 x 21 (533 x 533) x (600 x 600) 30 x 30 (750 x 750) 32 x 32 (800 x 800) x (900 x 900) 40 x 40 (1000 x 1000) 42 x 42 (1100 x 1100) 48 x 48 (1200 x 1200) 54 x 54 (1400 x 1400) 60 x 60 (1500 x 1500) 72 x 72 (1800 x 1800) 84 x 84 (2100 x 2100) 96 x 96 (2500 x 2500) A B C D E 20 (503) (604) 26 (653) 29 (737) 32 (803) 38 (953) 40 (1003) 44 (1104) 48 (1203) 50 (1303) 56 (1403) 65 (1679) 71 (1779) 83 (2079) 95 (2379) 107 (2780) 18 (452) 22 (553) (603) 27 (686) 30 (752) (902) 38 (952) 42 (1053) 46 (1152) 48 (1252) 54 (1353) 62 (1603) 68 (1703) 80 (2003) 92 (2303) 104 (2704) 20 (503) (604) 26 (653) 29 (737) 32 (803) 38 (953) 40 (1003) 44 (1104) 48 (1203) 50 (1303) 56 (1403) 65 (1679) 71 (1779) 83 (2079) 95 (2379) 107 (2780) 18 (452) 22 (553) (603) 27 (686) 30 (752) (902) 38 (952) 42 (1053) 46 (1152) 48 (1252) 54 (1353) 62 (1603) 68 (1703) 80 (2003) 92 (2303) 104 (2704) 211/8 (525) 221/8 (549) 1/8 (599) 261/8 (648) 271/8 (722) 301/8 (746) 331/8 (869) 3/4 (909) 423/4 (1057) 483/4 (1204) 563/4 (1503) G 16 (401) 20 (502) 22 (552) 25 (635) 28 (701) 3/4 (921) 383/4 (971) 423/4 (1072) 463/4 (1171) 483/4 (1271) 543/4 (1372) 603/4 (1571) 673/8 (1687) 793/8 (1987) 913/8 (2287) 1071/16 (2781) Standard Materials Part Body, Cover, Hinges, Hinge Arm Hinge Bushings Material Stainless steel (ASTM A0 Type 304L or 316L) UHMWPE (ASTM D4020) Seal for Flaps Up to (610 mm) Neoprene (ASTM D2000 Grade 2 BC510) Over 0 (610 mm) EPDM (ASTM D2000) Fasteners Stainless STeel (ASTM F593 and F594, GR1 for Type 304 and GR2 for Type 316) Note: Specifications available at 10
11 Design Features Series FVSPR, FVAC, FVACP, FVAR UPPER PIVOT is adjustable to vary the flap valve s sensitivity to unseating heads. RESILIENT SEAT is firmly bonded to the machined groove in the body. This seat is normally supplied as neoprene or BunaN rubber. Resilient seats are used where low backflow leakage rates are desired. LOWER PIVOT allows for a controlled amount of cover rotation to assure that cover seat and body seat lie in the same plane. ANTILOCKING BAR is supplied when specified, and prevents flap overturn damage. BRONZE SEAT is mounted in a machined, dovetailed groove. Mounting Options Mounted to cast iron wall thimble Mounted to standard pipe flange Mounted to concrete with anchor bolts Recommended for: FVSPR FVAD FVAR Recommended for: FVSPR FVAC FVACP FG60 FR40 Recommended for: FVSPR FVAC FVAR FG60 FR40 11
12 Engineered Flow Control Products from Rodney Hunt For more information about Rodney Hunt products or to contact a sales representative, visit the Rodney Hunt website ( In the United States Engineered Flow Control Products Gates Sluice Gates Bonneted Gates Channel Gates Weir Gates Crest Gates (including Bascule and Pelican designs) Tainter Gates Slide Gates Roller Gates Hinged Crest Gates Bulkhead Gates Velocity Control Gates Stop Logs Flap Gates Actuation Manual, electric, and hydraulic actuation systems are available. For more information about Rodney Hunt products or to contact a sales representative, visit the Rodney Hunt website ( or call RHFG0917
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