AWWA Butterfly Valves

AWWA BUTTERFLY VALVES

BUTTERFLY VALVES

Cohen’s AWWA Butterfly Valves are compliant to the AWWA C516 and C504 standards. They are often utilized as clean water and gas shutoff. The shaft of the valves is disc-shaped and has stainless steel edges with seals that are self-compensating. The valves come in two different sizes: the small valves are 3-20” and the larger ones are 24-144. Each valve size has its respective features. Small valves contain built-in body seats along with disc-locating features that prevent any leakages and extend seat life. On the other hand, large valves have a seat that is adjustable and replaceable. Apart from that, the latter features a disc structure that is not hollow, and the rubber seat is locked in the valve body using an epoxy wedge. Butterfly valves are a quarter-turn type of valves.

The water flows out by turning the handle or actuator of the valve by 90 degrees. The body design of the valve includes a round-shaped disk called end packings. The disc has holes all over for the screw bolts to connect directly to the pipe. These valves have several advantages compared to other valve types. Aside from its effortless operation, it can easily start, stop and regulate the water flow quickly due to the rotating small disc (the seat) found on the center of the end packings. Moreover, the rotating disc itself prevents water leakage as it seals the entire area when in a fully closed position. Its thin body design is practically made for large flows and low-pressure applications and affordability are the main reasons why most people prefer such valves. Nowadays, different types of valves that cater to various usages and water pressures are being manufactured and sold in markets.

The AWWA standard C504 is a set of established specifications set for the production of butterfly valves that top valve manufacturing companies are required to achieve. They assess the individual aspects of the butterfly valve meticulously. First, each newly-released valve design surpasses the features of its past models. Second, no signs of any leakages and corrosion should be present.
It only requires low maintenance and should only involve a not so huge amount for repairs. Moreover, the valves can perform well regardless of whatever conditions it may encounter. From the shell and steel thickness, torque, or twisting capabilities to the materials to create the valves, these must be considered and planned carefully before the start of manufacture.
Corrosion is a process that butterfly valves must avoid. It may accumulate tiny iron deposits which might flow through the valve body and pipe fittings that will contaminate water and endanger the lives of those who will be drinking it. Therefore, manufacturers have to guarantee that the steel used to create the valves are corrosion-resistant.
The manufacturers refrain from seats with fewer diameter sizes as these aren’t effective against corrosion which would result in damaging the rubber seats and fittings inside the valve. The seats placed on the disc valves are effortlessly removable and replaceable. Also, these are flexible and adjustable to move in different directions.
The seats placed in the middle of the discs are to be developed in a manner that it enables less hassle repair and replacement during its installation. Failure to carry out the aforementioned will mean countless repair efforts and money will be spent by the owner for the valve fixture.

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AWWA BUTTERFLY VALVE WORKING CONDITIONS

Butterfly valves are expected to work excellently without the need of monitoring water flow even during the worst situations. This is possible due to the edges of the valve discs which are made of stainless steel. In addition, its length and precision are what makes it suitable for industrial activities.

The valve’s low maintenance, effectiveness, and reliability add up to its list of advantages. Others include its variety of options included in its operation such as manual, automatic, and pneumatic configurations. A noticeable decrease in the operational cost is made possible by the valve’s durability.
Various materials were utilized for the production of butterfly valves to make sure the quality is not compromised. It can be observed that each material does have their respective pros and cons. With carbon steel, its advantage lies in its cost-efficient solutions offered to the customers.
One main disadvantage of carbon steel is its weak resistance from corrosion. However, this can be remedied by covering its surface using paint. Correspondingly, stainless steel is abundant in the market and is sold in several varieties such as austenitic, duplex, ferritic, and many more.
Convenience in both maintenance and operational costs assist in boosting the valves’ lifespan and conserving the owners’ time and effort since most are having difficulty coming up with solutions on fixing damaged valves.

The body of the butterfly valve is composed of the ASTM A536 65-45-12 stainless steel which passes or surpasses the AWWA C504 requirements for the ideal strength of the material. For the thickness, diameter and drilling methods of flanges follow the ANSI B16.1 Class 125 standards while the mechanical joint ends meet the needed ANSI/AWWA C111/A21.11 specifications.

DISC: Pressure drop within the valve is lessened and water flow is unobstructed due to the ASTM A536 65-45-12 disc made from stainless steel and its design.
DISC EDGE: The edges of the disc are composed of 316SS that decrease the torque removal tendencies and offer convenient services that would surely last for a long time.
SHAFT: The durability of the 316SS top and bottom shafts secures the disc to the body in order to produce better control of water flow.
SEAT: Customers are given the effortless replacement and removal properties with the elastomer seats tightly installed to the solid 316SS seat ring,
SHAFT DEALS: Chevron-styled seals placed on top and bottom are v-types that help secure positive sealing in order to avoid leakages.
BEARINGS: Top and bottom bearings are resistant to corrosion and offer operations that are both smooth and non-stick operations along with its compatibility for vertical and horizontal shaft loading.
COATING: Coatings are needed to evenly cover all surfaces of the body and disc with an epoxy of superior quality. These are also released with different types fit for various application types
TESTING: Every valve is subject to an individual test in accordance to the AWWA C504 standards.
ACTUATION: Butterfly valves come with a variety of parts such as lever, manual gear, pneumatic and electric.

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AWWA butterfly valves are assessed to have met the AWWA C504 standards. Switching the valves is done simply using the handle or manual gear operators with the optional inclusion of the pneumatic or electric handles or actuators based on the requirements. Don’t hesitate to call your local salesman for assistance in choosing the right valve size and other properties.

Used for the closing of clean and dirty water and gas valves
Includes a disc design that allows double pipes, a shaft resistant to corrosion, edges made of stainless steel and shaft seals that covers
To provide a positive sealing and longer seat life span on sizes 3 to 20 inches, manufacturers tend to recommend molded-in body seat along with some disc locators.
AWWA large butterfly valves, both the 24” and 600mm and above consist of a movable and repairable seat, hollow-free disc design and rubber seat installed
Practically made for various types of water maintenance systems, power, and industrial plantS
The Underwriters Laboratories, Inc. categorization follows the ANSI/NSF Standard 61 standards for drinking water system

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