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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If a large-diameter handwheel is of concern because of clearance or other limitations, the diameter should be aawwa to an acceptable dimension according to item 14 of Sec. Aawwa adequacy is to be demonstrated by testing valves selected to represent each basic type of seat design in each applicable size group in Table 6 and in a pressure class or classes equal to or greater than the valves being purchased.
The manufacturer shall establish and maintain a written quality-assurance program to control the qualified procedure and quality of finished parts.
ABAW-AWWA C504 and C517
A structural, raised-area boss member cast integrally on the valve body and used to support the valve-shaft bearing and valve shaft. Actuators shall be enclosed. The width of the seat surface shall, at a minimum, cover the entire surface wiped by, or in contact with, the rubber seat. Homepage About Us Contact Us. If shop inspection by the purchaser is required. Circumferential joints of rubber seats shall be bonded together.
Valve and actuator arrangement and position. Pressure classes as defined in Sec. Through our collective strength we become better stewards of water for the greatest good of the people and the environment. The number of turns to open and close for manual actuators d. Safety factors are the ratio of cylinder torque to required valve operating torque TR. For valves having direct-mounted actuators, except those with extension shafts of more than 36 in.
All valves c540 incorporate four tapped holes strategically located on each flange outside diameter. The purchaser should consult with the manufacturers and, if appropriate, specify special requirements for these components.
The valve shall have a clear inside diameter equal to the stated nominal diameter. The purchaser should be aware of the possibility of plating failure, particularly when the operating water is aggressive. The actuator shall be designed to control the valve in all positions, c540 fully open to fully closed and from fully closed to fully open, with control in awqa intermediate position. Corrosion-resistant metals used for clamping and retaining rubber seats, shaft and disc connection hardware, glands or gland assemblies, thrust bearings, and O-ring removable recesses that are wetted by line content shall be made of stainless steel, nickel-copper alloy, or bronze, conforming to the aforementioned requirements.
Do not expose rubber seats to sunlight or ozone for any extended period. The duration of the hydrostatic test shall be sufficient to allow visual examination for leakage.
The disc shall be free of hollow chambers. At no point shall the shell thickness be more than It is the responsibility of the user of an AWWA standard to determine that the products described in that standard are suitable for use in the particular application being considered.
VAG GA Series Butterfly Valve
Major changes included the addition of certain sprayed-metal seat surfaces and nonmetallic cylinder components as acceptable materials. An electromechanical actuator that employs the power of an electric motor converted through a gear-reduction unit.
Valve inlet and outlet piping should be supported as near to the valve as practical. The standard established three pressure and two velocity classifications, standards for materials, laying lengths, minimum body and disc designs, and actuator sizes for valves having rubber seats in the valve body. After the cycle testing, the actuator shall be completely disassembled and inspected to determine whether or not excessive wear or permanent deformation affecting its function has occurred.
Class B discs shall be ductile iron, fabricated steel, cast steel, or stainless steel. Diameters for all classes of valves except for class B are based on use of any allowable material. Two eye bolts shall be supplied with each valve.
Refer to item 26 of Sec. Allowed the use of the valves from the proof-of-design tests to be rebuilt and used as production valves. Valve discs shall be of a cast or fabricated design with no external ribs transverse to the flow. Sewage Treatment Plant Suggested Specs.
The polished Stainless Steel edge of the Ductile Iron disc assures users of a perfect seal every time. Maximum seating and operating torque requirements of the conditions defined in the scope.
If a leakage test in both directions is wwwa. A bearing awww is provided on the shaft outboard of the shaft aswa or in the actuator housing to protect the shaft seal from side-thrust forces induced by the c50.
Close the valve before installing. Torque, Head Loss, and Cavitation Analysis. Nuts, screws, and hardware used with clamps and retaining rings shall be of stainless steel or nickel-copper alloy. A welding process may be used to attach the mating surface to the disc or body. Seal leakage, broken parts, hard operation, and, in some cases, seat leakage should be corrected by a repair crew as soon as possible after a defect is reported. Tolerance for valves 12 in.
Epoxy coatings are more likely to result in a holiday-free surface. A circular-rimmed component connected to the input shaft of an actuator to facilitate manual actuation of a valve. The actuator is essentially an integral part of a butterfly valve.
The purchaser may require all records or may stipulate a breakdown of production aswa records or proof-of-design test records. To learn more about pricing, product customizations, delivery times and more, please call United Water Products directly at or send us an email through our Contact form. AWWA also provides quality improvement programs for water and wastewater utilities.
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.