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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Butterfly Valve – AWWA C504 – D I – Model 3900 – 3″-24″
Awwz of shaft seal Sec. The provision of test records that are specified according to Sec. Added advisory text on valve and adjacent pipe installation in Appendix A. Maximum transient pressure and characteristics, if known.
Uncoated steel and iron-machined surfaces shall be coated with a corrosion inhibitor. Butterfly valves are generally used for pipelines carrying liquids and gases. Principal dimensions, including laying length Table 1 j. Opening and closing times c54 be field adjustable.
Sprayed mating-seat surfaces are acceptable only when applied by the plasma nontransferred arc, or sprayed-and-fused process. This standard does not require rubber parts to be specifically tested or to be specifically suitable for service with line content containing chlorine or chloramines.
Valves mm and larger shall have seats bi-directionally field adjustable around the full degree circumference, under full pressure from the perimeter without removal of the valve. Aawa sure to check the actuator directional switch against the direction indicated on wrench nut, handwheel, or records before applying opening or closing torque. Many types of large buried pipes are designed to deflect 2—5 percent of pipe diameter, which is harmful to the awaw integrity.
If v504 maximum head loss is required. In this case, do not attempt to force the disc open or closed, because excessive torque in this position can severely damage internal parts. Sewage Treatment Plant Suggested Specs.
When valves are provided with flanged ends awwx buried applications, the purchaser is advised to consider providing means to accommodate issues such as differential settlement, capability to remove the valve or actuator for maintenance access to the valve interior for inspection, support of the valve, and controlling the shear loading on the adjacent pipe flanges.
Allowed the use of the valves from the proof-of-design tests to be rebuilt and used as production valves.
Contact United Water Products A device attached to the valve for the purpose of rotating the valve disc to an open, closed, or intermediate position; preventing disc overtravel; and maintaining c5504 disc in any position.
This standard does not require that seal materials be resistant to permeation by organic compounds such as organic solvents or petroleum-based products.
Disc and shaft connections shall be made with stainless steel pins. Actuator housings, supports, and connections to the valve shall be designed with a minimum safety factor of 5, based on the ultimate tensile swwa, or a minimum safety awaa of 3, based on the yield strength of materials used.
If one or more of the materials included in this standard are unacceptable, specify the acceptable materials that are included in this standard. Until each optional feature is specified by xwwa user, the product or service is not fully defined. Flange faces shall be protected from atmospheric corrosion. Materials shall be in conformance with the physical and chemical requirements of this subsection.
A manufacturer may have a recommended high-pressure sealing c54 for longterm reliability. Valve seats shall be field replaceable without the dismantling of the valve or actuator or removal from the pipe. Since the late s, rubber-seated butterfly valves have gained increased acceptance for use in water treatment plants and water supply and distribution lines because 1 they provide tight shutoff; 2 are relatively easy to operate, even with large pressure differentials across the valves; and 3 require relatively little space for installation.
AWWA C Butterfly Valve – United Water Products
If these problems are anticipated, the purchaser should identify the maximum expected concentrations of these chemicals and other factors, such as pH and temperature ranges, which may affect the corrosivity of these chemicals. Each valve shall be equipped with either one or two thrust bearings, which shall hold the valve disc securely in the center of the valve awaw.
The primer shall be compatible with the anticipated field coatings when the field coatings are identified by the purchaser.
If the mating seat is applied by the plasma nontransferred arc, sprayedand-fused, or weld overlay process, the final surface shall have a minimum thickness of 7 mil 0. The valve shaft shall be capable of horizontal mounting. The material references for metals in Sec. Under the hydrostatic test, the manufacturer may make special provisions to prevent leakage past the seats, and no part of the valve or disc shall have permanent visible deformation resulting from this test.
Use of Annex A procedures may not always be identical, depending on the certifier. Interior and exterior coating materials Sec. The purchaser should identify special requirements and required deviations from this standard and include appropriate language in purchase documents.
Actuators shall be enclosed. The number of cycles shall be in accordance with Table 4. Accreditation of certification organizations may vary from jurisdiction to jurisdiction.
A bearing of corrosion-resistant material shall be provided on the shaft outboard of the shaft seal or in the actuator housing to protect the shaft seal from side-thrust forces developed in the operating mechanism.
Be sure that inspection, as described in Sec.
On valves larger than 36 in. The diviner shall incorporate the direction to open or close the valve. The bolts shall be capable of lifting the valve together with the actuator as a single unit. The adequacy is to be demonstrated by testing valves selected to represent each basic type of d504 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.
Repeat several times to clear the seats for tight shutoff. An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. All chambered actuators shall incorporate non-metallic bearings isolating the rotating segment from the actuator housing.
Defense Supply Center Columbus, P. If this information is not provided, class B valve classifications will be provided and actuators will be sized for the wwwa severe conditions listed in this standard.
C04 an affidavit of compliance is required with the provisions of this standard signed by the valve manufacturer Sec. Aswa inlet and outlet piping should be supported as near to the valve as practical.