AWWA Butterfly Valves

AWWA BUTTERFLY VALVES

BUTTERFLY VALVES

Cohen’s AWWA Butterfly Valves comply with the AWWA C516 and C504 standards. They are often utilized in clean water and gas shutoff applications. The shaft of the valves is disc-shaped and has stainless steel edges with self-compensating seals. The valves come in two different size groupings: the small valves are 3-20” (80-500mm), and the larger ones are 24-144” (600-3600mm). 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, larger valves have a seat that is adjustable and replaceable. 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 valve. 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 packing. The disc has holes 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 small rotating disc (the seat) found on the center of the end packings. Moreover, the rotating disc prevents water leakage as it seals the entire area in a fully closed position. Its thin body design is practically made for large flows, and low-pressure applications and affordability are why most people prefer such valves. Nowadays, different valves that cater to various usages and water pressures are manufactured and sold in markets.

The AWWA standard C504 is a set of established specifications for producing 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 leakages and corrosion should be present.
It only requires low maintenance and should involve a not so huge amount for repairs. Moreover, the valves can perform well regardless of their conditions. 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 that might flow through the valve body and pipe fittings to contaminate water and endanger the lives of those drinking it. Therefore, manufacturers have to guarantee that the steel used to create the valves is corrosion-resistant.
The seats placed on the disc valves are effortlessly removable and replaceable. Also, these are flexible and adjustable to move in different directions. 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 in the middle of the discs are to be developed to enable less hassle repair and replacement during its installation. As mentioned above, failure to carry out the will means the owner will spend countless repair efforts and money on the valve fixture.

(713) 467-3300

AWWA BUTTERFLY VALVE WORKING CONDITIONS

Butterfly valves are expected to work excellently without 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 make it suitable for industrial activities.

The valve’s low maintenance, effectiveness, and reliability add to its advantages. Others include various options 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 to produce butterfly valves to ensure the quality was not compromised. It can be observed that each material does have its respective pros and cons. Carbon steel’s advantage lies in its cost-efficient solutions offered to the customers.
One main disadvantage of carbon steel is its weak corrosion resistance. 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 assists in boosting the valves’ lifespan and conserves the owners’ time and effort since most are having difficulty finding solutions to fix damaged valves.

The butterfly valve body is composed of the ASTM A536 65-45-12 stainless steel, which passes or surpasses the AWWA C504 requirements for the material’s superior strength. 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, decrease the torque removal tendencies, and offer convenient services that would surely last a long time.
SHAFT: The durability of the 316SS top and bottom shafts secures the disc to the body to produce better water flow control.
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 to avoid leakages.
BEARINGS: Top and bottom bearings are resistant to corrosion and offer smooth and non-stick operations and 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 according to the AWWA C504 standards.
ACTUATION: Butterfly valves come with various operators such as a lever, manual gear, pneumatic and electric.

(713) 467-3300

AWWA butterfly valves are assessed to have met the AWWA C504 standards. Opening and closing 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 cover
To provide a positive sealing and longer seat life span on sizes 3 to 20 inches, manufacturers tend to recommend molded-in body seats and some disc locators.
AWWA large butterfly valves, both 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

(713) 467-3300