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Clearance beyond the valve body required for the valve disc to open fully 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. Flow direction is important in the installation and use of a butterfly valve. The material references for metals in Sec. Sprayed mating-seat surfaces are acceptable only when applied by the plasma nontransferred arc, or sprayed-and-fused process.
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ANSI AWWA C504 00 Rubber Seated Butterfly Valves
Flanges shall be flat faced. For any overlay, the following performance items are required: For Method A, the minimum strength shall be not less than psi 1, kPa. If a leakage test with the actuator attached is required. The purchaser may require these alloys for specific applications according to item 11 of Sec.
This should be discussed by the purchaser and the manufacturer.
An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. Unless the owner has skilled personnel and proper equipment, any major internal problem will probably require removal of the valve from the line and return to the manufacturer for repair.
The metal ring around the inside of the valve body or the outside edge of the valve disc that seals with the rubber seat when the disc is closed. The actuator shall be designed to control the valve in all positions, from fully open to fully closed and from fully closed aww fully open, with control in any intermediate position.
The markings shall show the valve size, manufacturer, class, and year of manufacture. The portion of the shaft that extends through the valve bearings shall be full size. This standard allows a party other than the valve manufacturer to mount an actuator to a valve. Unless otherwise specifically requested by the purchaser, bodies of valves shall be of gray iron, ductile iron, or alloy-gray iron.
The smallest diameter of the shaft shall be capable of transmitting the maximum calculated valve-operating torque without the torsional shear stress exceeding 40 percent of the yield strength of the shaft material.
Actuators used for modulating service shall be rated to produce not less than twice the required valve dynamic torque. Each valve shall have a one-piece shaft extending completely through the valve disc or have a stub-shaft arrangement, as described below. Rubber compounds shall contain no more than 1.
ANSI AWWA C 橡胶垫密封蝴蝶阀_百度文库
This standard pfd seating surfaces of stainless steel or nickel-copper alloy in cases where valves are to be operated more frequently than once a month. The body and shaft seal shall be watertight.
Clamps and retaining rings for rubber seats shall be made of corrosion-resistant metallic material, as referenced in Sec. Adjacent pipe must be supported or stiffened to provide a round mating connection for the valve in service.
Description of connecting piping: Use of This Standard. This may result in a significant unwarranted expense. Research has documented that pipe materials such as polyethylene, polybutylene, polyvinyl chloride, and asbestos cement; and elastomers, such as used in jointing gaskets and packing glands, may be subject to permeation by lower molecular weight organic solvents or petroleum products.
The internal hydrostatic pressure for which the valve body is designed without regard to disc position or actuator capacity.
AWWA C Rubber-Seated Butterfly Valves
The standard established three pressure pvf 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. Epoxy coatings are more likely to result in a holiday-free surface.
The tentative standard was written to describe the then-available types of standard rubber-seated butterfly valves that had been in successful operation for at least five cc504 prior to The alternative hydrostatic leakage test, per Sec.
Do not deflect the pipe-valve joint. Rubber seats of valves 30 in. The AWWA standards usually contain options that must be evaluated by the user of the standard.
Valves larger than 36 in. Valve x504 shall be designed to be leak-tight in both directions at differential pressures up to, and including, the rated pressure of the valve class.
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.