BUTTERFLY VALVE : POWER & WATER
| DESCRIPTION | MATERIAL USED |
|---|---|
| SIZE RANGE | 40 mm to 4000 mm* |
| DESIGN PRESSURE | Up-to 30 Bar* (For soft seated valves) |
| TEMPERATURE RANGE | Up-to 180 °C for soft seated valves and 300 °C for metal seated valves |
| DESIGN & GOVERNING STANDARD | IS / BS / ISO / AWWA / JAWA / API |
| CONSTRUCTION | Cast / Fabricated |
| END CONNECTION | Wafer / Lug Wafer / Flanged / Butt-welded |
| MODE OF OPERATION | Manual / Pneumatic / Electric / Hydraulic |
* Higher Sizes / Pressure available on request
Introduction
Butterfly Valve : Power & Water
A butterfly valve is a pipeline accessory used either to regulate process fluid flow or to isolate the system from the process fluid.
Butterfly valves are widely used in power plants (thermal, nuclear, gas-based and hydropower), water pumping, transmission and treatment systems, utility plants in various process industries, refineries, and petrochemical industries.
Though primarily used for isolation purposes, butterfly valves can also be used for control duty applications.
Brief History of Valve
- The use of valves to regulate water flow dates back to the Indus Valley Civilization (1700–1800 BC).
- Major valve design advancements began during the Industrial Revolution with the development of the steam engine (around 1700 AD).
- The modern butterfly valve was first invented by Carl Benz in 1893 to regulate the flow of gasoline in a carburetor.
- The early 1920s saw the emergence of hydropower technology, leading to development and testing of various valve designs.
- From the 1950s onward, butterfly valves were extensively used in hydropower plants, and resilient seated butterfly valves gradually replaced sluice gate valves for isolation of water pipelines.
Features
- FOURESS Butterfly Valves are mechanically superior, structurally sound, of fool-proof design, easy to operate, and highly reliable.
- A streamlined disc profile ensures smooth flow and low pressure drop. The disc is designed for strength and minimum deflection, eliminating the possibility of flutter.
- Single-piece in-situ replaceable resilient rubber seals, combined with a stainless steel seat ring, provide drop-tight sealing. The seat ring is electrically insulated from the body to resist galvanic corrosion. Metal-seated valves are also available for high-temperature applications and for fluids containing foreign particles.
- Static shaft sealing in ‘O’ ring / SCN ring construction. Stuffing box design is available on request.
- Clamping ring available in segmental or single-piece construction. Segmental design ensures uniform seal seating and allows local adjustments.
- Thrust pad enables vertical shaft orientation and acts as a centralizing device for the shaft-disc assembly.
- Drive shafts are generously designed to transmit maximum operating output torque.
- Self-lubricating bearings withstand hydrostatic disc load and are specially designed for edge loading characteristics.
- Suitable for both horizontal and vertical installation.
Design Specifications
Product : Single/Double Eccentric, Single/Double Seal, Rubber Seated Butterfly Valve – Power & Water
| Parameter | Details |
|---|---|
| Size Range | 40 mm to 4000 mm* |
| Design Pressure | Up to 30 Bar* (For soft seated valves) |
| Temperature Range | Up to 180°C for soft seated valves and 300°C for metal seated valves |
| Design & Governing Standard | IS / BS / ISO / AWWA / JAWA / API |
| Mode of Operation | Manual / Pneumatic / Electric / Hydraulic |
| End Connection | Wafer / Lug Wafer / Flanged / Butt-Welded |
| Construction | Cast / Fabricated |
| Material of Construction (MOC) | |
| Body – Cast |
Cast Iron (IS 210 Gr FG 260 / ASTM A126 Class A, B &
C) Ductile Iron (IS 1865 Gr 400/12, 500/7 / ASTM A536 Gr 65-45-12) Cast Carbon Steel (ASTM A216 Gr WCB) Stainless Steel (ASTM A351 Gr CF8 / CF8M / CF3 / CF3M) Ni-Resist Cast Iron (ASTM A439 Type D2) Duplex Stainless Steel (ASTM A995 Gr 4A) Super Duplex Stainless Steel (ASTM A995 Gr 5A) |
| Body – Fabricated |
Carbon Steel (IS 2062 E 250 BR / ASTM A36 / ASTM A516 Gr
60/70) Stainless Steel (ASTM A240 Type 304 / 316 / 304L / 316L) Duplex Stainless Steel (ASTM A240 UNS S31803) Super Duplex Stainless Steel (ASTM A240 UNS S2550 / UNS S32750) Bronze Optional: Ebonite / FRP / EPDM Lining |
| Disc – Cast |
Cast Iron (IS 210 Gr FG 260) Ductile Iron (IS 1865 Gr 400/12, 500/7) Cast Carbon Steel (ASTM A216 Gr WCB) Stainless Steel (ASTM A351 Gr CF8 / CF8M / CF3M) Ni-Resist Cast Iron (ASTM A439 Type D2) Duplex Stainless Steel (ASTM A995 Gr 4A) Super Duplex Stainless Steel (ASTM A995 Gr 5A) |
| Disc – Fabricated |
Carbon Steel (IS 2062 E 250 BR / ASTM A516 Gr 60/70) Stainless Steel (ASTM A240 Type 304 / 316 / 316L) Duplex Stainless Steel (ASTM A240 UNS S31803) Super Duplex Stainless Steel (ASTM A240 UNS S2550 / UNS S32750) Bronze Optional: Ebonite / FRP / EPDM Lining |
| Shaft |
Stainless Steel (SS 410 / SS 431 / SS 304 / SS 304L / SS
316 / SS 316L) Duplex Stainless Steel (UNS S31803) Super Duplex Stainless Steel (UNS S32550 / UNS S32750) |
| Service Seal |
Nitrile Rubber / EPDM Rubber / Viton / Natural Rubber
(Encapsulation on SS Hose) SS 304 / SS 316 / SS 316L / UNS S31803 / UNS S32550 / UNS S32750 |
| Maintenance Seal (Optional for Dual Seal Valves) |
Natural Rubber (Encapsulation on SS Hose) |
| Seat Ring |
Stainless Steel (ASTM A240 Type 304 / 316 / 316L) Duplex Stainless Steel (ASTM A240 UNS S31803) Super Duplex Stainless Steel (ASTM A240 UNS S2550 / UNS S32750) |
| Clamping Ring |
Stainless Steel (CF8 / CF8M / CF3 / CF3M) Duplex Stainless Steel (ASTM A995 Gr 4A) Super Duplex Stainless Steel (ASTM A995 Gr 5A) |
| Bearings | Leaded Bronze (BS 1400 LB2) / Gun Metal (BS 1400 LG2) / Bronze Backed or Stainless Steel Backed PTFE |