AWWA CAST IRON SWING CHECK VALVE.pdf

AWWA CAST IRON SWING CHECK VALVE APRIL 2004 2 0 BODY The Milliken flanged check valve body and cover are manufactured of ASTM A-126 Class B cast iron using high pressure molding techniques for consistent qual- ity and precision. Integral flanges are in full compli- ance with ANSI B16.1 Class 125. BODY SEAT Body seats are constructed of ASTM B-62 bronze and are field replaceable to extend the life of the valve. Seats can be replaced without removing the valve from the line. INSTALLATION Milliken swing check valves are suitable for horizontal pipelines or vertical pipelines with media flow upwards. Advise if vertical installation is required at time of order. COATING The exterior of all valves are furnished with our stan- dard universal primer suitable for field coatings as required. Special coatings can be provided when required by the customer. FLOW Swing check valves having six diameters of straight pipe upstream and three diameters downstream are suitable for liquid velocities of up to 10 feet per sec- ond. For turbulent flow, velocity should not exceed 6 feet per second. HINGE PIN The Milliken flanged check valve employs 304 stain- less steel hinges or hinge pins. In the lever and weight model a cast iron adjustable gland is provided on the lever side. DISC The disc has a wide hinge support and upon closure meets the body seat without rubbing. Disc rings are available in bronze or bonded and vulcanized Buna Nitrile. Disc coatings are also available in EPDM, Viton, or Neoprene rubber. Elastomer coated discs are recommended for low pressure and air or gas applications where a repeatable tight shutoff is required. The unique disc/hinge design allows disc replacement without removing the hinge pin bearings. LEVER/SPRING/WEIGHT The Figure 801 can be supplied with a carbon steel lever and adjustable weight. The lever position can be adjusted to suit either horizontal or vertical instal- lations and to alter the closing characteristics. The Figure 801 is also