https://psi-team.com
800-223-1468
Piping Specialties Inc. (PSI) is one of the northeast's largest suppliers of valves; process controls/instrumentation, and engineered mechanical specialties. Industries served: Power Generation, Pulp/Paper, HVAC, Water/Wastewater, Food/Beverage, Life Sciences, Chemical/ Process, Semiconductor. For more information visit PSI-Team.com or call 800-223-1468.
A butterfly valve has a disc that is in the fluid flow path. In the most common style of butterfly valve, the disc revolves around a central axis, the stem, via a 90-degree arc from parallel to the flow direction (open) to perpendicular to the flow direction (closed). Butterfly valves have a straightforward design with few moving components, making them simple to repair and maintain. The valve has four main parts: the body, the stem, the disk, and the seat.
The butterfly disk is always in the flow path, but its thin profile has little effect on flow. Butterfly valves are popular because they provide tight shut-off, are available in various materials and sizes, and may be easily automated using a variety of quarter-turn electric and pneumatic actuators.
You'll find butterfly valves in a wide range of industrial applications, from managing the flow of water to handling far more hazardous industrial fluids. Many industries use butterfly valves, including water treatment, chemical processing, pulp, paper manufacturing, food processing, power generation, etc.
There are two primary classifications of butterfly valves:
High-performance butterfly valves include carbon or stainless steel bodies with Teflon seats and can withstand more significant pressures and temperatures. Resilient seated valves usually feature ductile iron or aluminum bodies and operate at lower pressures and temperatures.
Butterfly valve bodies are available in two mounting styles: lug and wafer. Lug bodies include cast-in lugs with bolt hole designs that match pipe flanges. A wafer body valve does not have a mounting hole pattern, and mounting is facilitated by sandwiching the valve between two pipe flanges, with mounting bolts around the valve body. Wafer-style bodies are less costly. An advantage to lug body valves is their use as a dead-end valve, whereas wafer valves are unsuitable for this service.
The stem is a one or two-piece shaft that keeps the disk in place and provides the rotational torque that allows the disk to open and shut. The stem of resilient seated valves has protection from the process media by packing rings, allowing for a more cost-effective solution to regulate the valve's application to various potentially corrosive media. High-performance butterfly valve stems come into touch with process media and must be media suitable.
The disk is the valve component that comes into direct contact with the process medium and regulates flow. Disks are available in various materials and optionally come with corrosion-resistant polymer coatings. Some butterfly valves include contoured disks that are carefully aligned with the stem to increase flow control, modify torque needs, or give the valve a longer life.
A resilient seated valve closes via an "interference fit," which means the disk forces itself into the seat. The seat is the soft substance (polymer elastomer) including Buna-N and Nitrile, and should be specified depending on the process medium involved.
High-performance butterfly valves use an interference fit as well, but with significantly tighter tolerances, but also ensure tight seating with assistance from upstream pressure. PTFE or RTFE are the most often used materials for HPBV seats. Metal seats on HPBVs accommodate more significant pressure and temperature applications.
Like other valves, butterfly valves have applications in which they outperform. To apply the optimum solution to your flow control applications, combine your process knowledge with your product knowledge with the application skills of a proven valve engineering professional. Contact Piping Specialties, Inc. for more information about industrial valves. Visit https://psi-team.com or call 800-223-1468.
A-T Controls / Triac "V" Series Ball Valves are ideal for achieving more precise control while maintaining simplicity and sealing features. A-T Controls offers 1/2" – 4" 3-piece and 1/2" – 6" flanged sizes. Standard "V" notch angles are 30°, 60°, and 90°. While manual valves are available, A-T Controls specializes in automating them to meet your specific control needs.
V-port valves provide more accurate and consistent control than traditional round ported ball valves.
A-T Controls manufactures "V" port valves with the control port cast and machined into the ball rather than the seat, resulting in significantly improved flow characteristics and the elimination of the need to replace seats. The 30° option provides finer tapered control throughout the valve rotation, while the 60° and 90° options offer a higher Cv as well as controlled flow.
The V7 valves come standard with a PTFE seat, while the V8, V9, and FVD9 V-port valves come standard with a 50/50 STFE seat. The 50/50 SST powder/PTFE blend provides both strength and superior sealing properties.
For more information, contact Piping Specialties, Inc / PSI Controls. Call them at 800-223-1468 of visit their website at https://psi-team.com.
The NS Series floating ball valves and NS Series butterfly valves from A-T Controls are NSF 61 (Drinking Water System Components- Health Effects) and NSF 372 certified (Drinking Water System Components- Lead Content). NSF 61 means that NS Series valves are certified in water treatment, water purification, potable water, and water distribution systems (Underwriters Laboratories) and meet North American lead content criteria for “lead-free” plumbing.
Piping Specialties / PSI Controls
https://psi-team.com
800-223-1468
A-T Controls is a global leader in the design, manufacturing, and sale of manual & automated process valves for all types of industries. A-T Controls is known for its extensive inventory and highly experienced staff that enable them to provide the customer solutions needed to fulfill most valve and actuator requirements while offering both a competitive price and the fastest turnaround in the industry.
A-T Controls products provide high-performance operation in virtually every industry, including Oil & Gas, Refining, Petrochemical, Chemical Processing, Pulp & Paper, Mining, Transportation, Food and Beverage, Pharmaceuticals, Marine, HVAC, Power, and more.
A-T Controls Products Include:
High Performance Butterfly Valves; Resilient Seated Butterfly Valves; Trunnion Mounted Ball Valves; Pig Valve Dual Valve; Isolation Valve Assemblies; Cryogenic Ball Valves; Lined Ball Valves; Tank Bottom Valves; Electric Actuators; Spring Return Electric Actuators; Fail Safe Electric Actuators; Heavy Duty Actuators; Pneumatic Scotch Yoke Actuators; Pneumatic Rack & Pinion Actuators; 180ยบ Pneumatic Actuators; Stainless Steel Pneumatic Actuators; Declutchable Gear Operators; Gear Operators; Limit Switches; Solenoids; Positioners.
DOWNLOAD THE A-T CONTROLS PRODUCT GUIDE
For more information, contact Piping Specialties, Inc / PSI Controls. Call them at 800-223-1468 of visit their website at https://psi-team.com.
Many toxic, corrosive, and reactive chemicals are used in pulp and paper mills in chemical pulping. This incredibly hostile environment requires well-engineered automatic valve systems and durable valve actuators, spring units, and positioners.
Suppose you understand how paper is made and what chemicals are usually used in the atmosphere. In that case, you can instantly understand why special consideration is required for valve and actuator selection.
In the early stage of paper production, digesters combine high heat and a heavy alkaline liquid called "white liquor" to convert wood chips into a pulp during separation from wood chips. White liquor (mainly sodium hydroxide and sodium sulfide), process water, heat, and pressure are used to separate wood chips into lignin and cellulose fibers. The white liquor breaks down the lignin (the substance that binds the wood fiber together) in wood chips. The resulting combination of water and spent white liquor produces "black liquor." This liquid pulp residue mixture made up of lignin and hemicellulose, and inorganic compounds such as sodium hydroxide and sodium sulfide is toxic. Another by-product of this process is Hydrogen Sulfide, a toxic, corrosive, and flammable gas.
In piping and ball valves, managing these process chemicals and by-products is difficult. Pipe diameters range from 2"-10", but the most common sizes are 4", 6" and 8." Usually, these processes are ANSI / ASME Class 150 and ANSI / ASME Class 300, the most common end connection being 150 # and 300 #. Process temperatures are usually high, between 250 ° F and 350 ° F. The valve body and end connection materials are generally 316 stainless steel, but you'll also find carbon steel requested. Applications can include manual lever, gear operators, pneumatic actuators, and electrical actuators in valve assemblies.
The most concerning issue is the sticky molasses-like liquor builds upon the ball valve face and contaminates the back seat spaces, inducing strong internal clearance forces, resulting in valve lock-up over long static periods. A superior ball valve seat design from A-T Controls addresses the viscous material problem.
A-T Controls developed a solution for this extreme pulp and paper service and black liquor service with notable improvements to their FMS series. This valve incorporates a "scraper seat" feature that eliminates the molasses-like residue baked on the ball's face and eliminates valve lock-up. The addition of Aflas ® o-rings seal the seat cavity from media build-up, and a Venturi hole in the ball is also provided.
Typical black liquor ball valve from A-T Controls:
Please consult a Piping Specialties Applications Engineer for material selection for your black liquor application. This information is a guideline, and customers are solely responsible for construction materials, preparation of the valves for service, and lubricants being compatible with their black liquor application.
For a free consultation, call Piping Specialties at 800-223-1468 or visit their website at https://psi-team.com.