Quality is designed into every Stonetown Butterfly Valve. The SR series features precision machined parts and utilizes a phenolic backed cartridge seat to ensure years of dependable operation. Stonetown Butterfly Valves meet the rigorous requirements of industrial applications requiring positive shut off/zero leakage in the handling of liquids, gases, and slurries. Industries include: HVAC, Food and Beverage, OEM, Chemical/Petrochemical, Pulp and Paper, Water Purification, and Power & Utilities. EPOXY CORED BODY Stonetown Butterfly Valves are available in sizes 2”– 24”, tapped lug body, or wafer design with locating holes. Both designs are for use with ANSI 125/150 weld-neck or slip-on flanges. Basic design complies with API 609, ISO5752, and MS-SP67. MOUNTING FLANGE Universally recognized ISO 5211 standard for adaptation to pneumatic and electric actuators, mechanical position transmitters, gear operators and handles.
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A butterfly valve is from a family of valves called quarter-turn valves. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The "butterfly" is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to throttle flow.
Type of Butterfly Valve
Concentric Disc Butterfly Valve is widely used in water treatment and other industries, because of its advantages: light weight, small size and easy for installation, low cost. The most basic butterfly valve design is commonly called a concentric or resilient-seated butterfly valve. In this type of valve, the stem is centered in the middle of the valve disc, which is centered in the pipe bore. This valve typically has a rubber (or resilient) seat and relies on the disc having a high level of contact with the seat to affect a seal. The valves are provided with integrally moulded elastomer body liner for perfect seating and complete isolation of body material from fluid media. No gaskets are required as the body liner effects a perfect seal between the valve body and the mating pipe flanges. Sealing is provided by preloaded contact between flat seat surface and rounded polished disc hub area. Valves are designed and manufactured as per BS 5155/API 609/AWWA C504. The valves are available for all fluid service requirements with suitable body liner, disc material combinations for up to 210o deg.C in PN6, PN 10, PN 16, ANSI 125 & 150 rating. Other special materials and design are also provided according to the customer’s requirement.
In a single-offset Butterfly valve, the stem is located behind the disc. There are few, if any, valves of this type left on the market today due to the development of the double-offset, or high- performance, valve. The single-offset of the stem causes the disc to contact the seat with three to four degrees left to travel with the idea that less seat contact will enable the valve to last longer. Offset Disc Butterfly valves are designed to withstand higher pressure than the concentric disc design. In this design, the disc remains in contact with the seat only during closing of the valve. Due to this design, the seat lasts for longer period than in Concentric Disc design. Offset disc butterfly valves are suitable to replace the sealing element as and when required.