UWP Model , Ductile Iron Butterfly Valve – Conforms to AWWA C – DI Bodies translate into pure strength achieving three times that of Cast Iron alone. AWWA C Rubber-Seated Butterfly Valves. Document Language: English; Published By: American Water Works Association (AWWA); Page Count: The butterfly valves shall conform to the latest edition of AWWA-C Standard for Rubber Seated Flanged AWWA Butterfly Valves. The valves and actuators.
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The markings shall show the valve size, manufacturer, class, and year of manufacture.
Valves under mm shall have the seats recessed in the body and supported on three sides. The manufacturer shall have previously manufactured rubber-seated AWWA butterfly valves of the same design for a minimum period of five years.
Check the bolting attaching the actuator to the valve for loosening in transit and handling. A manufacturer may have a recommended high-pressure sealing side for longterm reliability. AWWA standards describe minimum requirements and do not contain all of the engineering and administrative information normally contained in specifications.
Hydraulic testing, flow capacities, and valve torques are based on the flow, upstream of a valve, being uniform and undisturbed, like the flow produced by a long length of constant-diameter, straight pipe. Each valve shall have a one-piece shaft extending completely through the valve disc or have a stub-shaft arrangement, as described below.
Full-face flange protectors of waterproof plywood or weather-resistant pressboard, of at least the outside diameter of the flange, shall be fastened to each flange to protect both the flange and the valve interior.
AWWA C504 Rubber Seated D.I Butterfly Valve
Contact United Water Products Free standing torque tubes. Valve seats shall be designed to be leak-tight in both directions at differential pressures up to, and including, the rated pressure of the valve class.
STORAGE If it is not practical to store the valve indoors, protect the valve and actuators from weather and the accumulation of dirt, rocks, and debris. Laying lengths for class 25, 75, and flanged-end and wafer valves shall be as specified in Table 1. Piping to and from the valve should be adequately supported and controlled. Disc and shaft connections shall be made with stainless steel pins. Specify any limitations on acceptability of seat materials or sprayed seats for specific applications or specific products.
The purchaser should specify xwwa coating, or special protection systems if required for severe conditions such as exposure to corrosive soils, corrosive water, fumes, or abrasion. Added ductile iron as an acceptable material for actuator worm gears in buried service. There is no standard laying length for class flanged-end bodies or mechanical-joint end bodies, except as footnoted in Table 2.
AWWA C Rubber Seated D.I Butterfly Valve – GLOFA VALVE CORP. I GLOFA VALVE MANUFACTURER
Refer to item 26 of Sec. Zastrow, Underwriters Laboratories Inc. The purchaser should consult with the manufacturers and, if appropriate, specify special requirements for these components. Shaft seals shall be designed for the use of standard V-type packing; O-ring seals; O-ring loaded U-cup seals; or a pull-down packing.
If this is a concern, requirements on actuator mounting should be included in the purchase documents. This removes most of the static load and allows identification of piping fit problems during installation and zwwa removal of the valve for maintenance. Valves larger than 36 in.
Standardized tests measuring resistance to chlorine- or chloramine-bearing waters were not available at the date of revision of this standard. This standard recommends seating surfaces of stainless steel or nickel-copper alloy in cases where valves are to be operated more frequently than once a month.
The duration of the hydrostatic test shall be sufficient to allow visual examination for leakage. Rubber seats applied to the valve body and penetrated by the valve shaft shall be adequately reinforced to prevent the seat from becoming inflated by pressure behind the seat. This information aqwa be provided for each size and class of valve.
Use of Annex A procedures may not always be identical, depending on the certifier. Close the valve before installing. A rubber ring around the outside edge of the valve disc or the inside of the valve body to effect a seal against the metal seating surface when the disc is closed. Valve component materials Sec.
Rotork: AB AWWA C And C
All seats shall be of a natural or synthetic rubber. Maximum transient pressure and characteristics, if known. Be sure that inspection, as described in Sec. There shall be no indication of leakage past the valve disc visible in the form of bubbles in the water pool on top of the disc during the test period.
Many butterfly valves have different sealing characteristics on one side vs. All chambered actuators shall incorporate non-metallic bearings isolating the rotating segment from the actuator housing. When selecting this option, all flange 5c04 shall be tapped. A device that supports the axial forces of the shaft and is used to center the disc in the valve body.