Trade.Information

Product Name: Tilted Disc® Check Valves

Product Description

Our Tilted Disc® Check Valve provides both low head loss and non-slam performance. Its streamlined body contouring, flow area 40% greater than nominal pipe size, and hydrodynamic disc combine to provide the lowest head loss of any check valve produced today. Non-slam closing is assured by both an angled seat design which minimizes disc travel and an eccentrically mounted disc. Top and/or bottom mounted dash pots may be added for systems with extreme conditions such as excessively high shut-off heads or volatile reverse flows to further assure against valve slamming. The valve's tapered seat and disc, designed with wear resistant materials, assures tight seating and long life even in the most severe applications. While not recommended for flows bearing solids, our Tilted Disc® Check Valves are an excellent choice for a wide range of applications such as raw water, cooling water and treated water/wastewater applications. Independent cycle and flow test reports are available on request. Specifications: - Scope 1.1 This specification is intended to cover the design, manufacture, and testing of 2 in. (50 mm) through 60 in. (1500 mm) Tilted Disc® Check Valves suitable for pressures up to 400 psig (2750 kPa) water service. 1.2 Check Valves shall be of the Tilted Disc®, metal seated, full body type capable of accepting optional bottom or top mounted oil dashpots. Connections 2.1 The valves shall be provided with drilled flanges in accordance with ANSI B16.1 for Class 125 or Class 250 iron flanges and ANSI B16.42 for Class 150 ductile iron flanges. Iron flanges shall be flat faced. 2.2 Flanged inspection ports shall be provided upstream and downstream of the valve disc for inspection or use with optional dashpots on 6 in. and larger valves. Design 3.1 The valve body shall consist of two sections bolted together as a central diagonal flange inclined at an angle of 55 degrees. The inlet body section shall contain a seat ring positioned and captured by the diagonal flange. The outlet body section shall accept eccentrically located pivot pin trunnions with sealed covers and lubrication grease fittings. 3.2 The eccentric pivot trunnions shall be located to divide the disc into approximately 1/3 and 2/3 proportions and also allow the seating surface of the disc to rotate away from the seating surface of the seat ring without contact. Clearance shall be provided between the pivot pin and bushing when the disc is seated to prevent binding and to ensure a tight seal. The minimum pivot pin diameter shall be as shown below. 3.3 The flow area through the valve body inlet and outlet shall be equal to the nominal pipe size and gradually increase to an area 40 percent greater at the valve seat. 3.4 A position indicator shall be supplied on 6 in. and larger valves and visually show disc position at all times. 3.5 The valve disc and seat shall have a seating surface finish of 32 micro-inch or better to ensure positive seating at all pressures. The leakage rate shall not exceed one-half of the allowable rate allowed by AWWA Standard C508 or 0.5 oz (15 ml) per hour per inch (mm) of valve size. 3.6 6” and larger valves should be capable of accepting a field installed Bottom Mounted Oil Dashpot.