Butterfly Valve
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Butterfly Valve
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A butterfly valve is a type of valve that consists of a rotating disc or blade with a rod or shaft attached to it. The valve is typically mounted between two flanges in a pipeline and is used to control the flow of fluids such as water, gas, or chemicals. The disc is rotating on a shaft that is connected to an actuator, which can be manual, pneumatic, or electric. When the actuator turns the shaft, the disc rotates, allowing or blocking the flow of fluid through the valve. The valve’s simple design and low maintenance requirements make it a popular choice for a wide range of applications, including water treatment, chemical processing, and HVAC systems.
The butterfly valve’s operating principle is based on the rotation of the disc to open or close the valve. When the disc is parallel to the flow direction, the valve is fully open, allowing maximum flow. As the disc rotates, it creates a barrier to the flow, reducing the flow rate until the valve is fully closed. The valve’s flow characteristic is typically quick-opening, meaning that a small rotation of the disc results in a large change in flow rate. This makes the butterfly valve well-suited for applications where precise flow control is not required, but a simple and reliable shut-off valve is needed. Overall, the butterfly valve is a versatile and widely used valve type that offers a cost-effective and efficient solution for controlling fluid flow in various industries and applications.
Features Of Butterfly Valve
- Compact Size and Weight
- Quick Opening and Closing
- Low Pressure Drop
- Wide Range of Sizes and Materials
- Low-Maintenance Design
- Disc Design
Applications Of Butterfly Valve
- Water Treatment Plants
- Wastewater Treatment Plants
- Power Generation Plants
- Chemical Processing
- Oil and Gas Industry
- Fire Suppression Systems
Specifications Of Butterfly Valve
| Valve Type | Wafer Butterfly Valve |
| Body Material | Cast Iron (ASTM A126 Class B), Ductile Iron (ASTM A536 65-45-12), Stainless Steel (304, 316), Carbon Steel (A216 WCB) |
| Disc Material | Ductile Iron (with various coatings), Stainless Steel (304, 316), Aluminum Bronze |
| Seat Material | EPDM, Buna-N (Nitrile), Viton (FKM), PTFE (Teflon) |
| Size Range | 1.5" (DN40) to 24" (DN600) or larger (varies by manufacturer) |
| Pressure Rating | 150 PSI (10 bar), 200 PSI (14 bar), 250 PSI (17 bar) - Varies significantly based on material and size. Check the specific valve rating. |
| Temperature Range | -20°F to +250°F (-29°C to +121°C) - Varies greatly depending on seat material. PTFE can handle higher temperatures. |
| Connection Type | Wafer (sandwiched between flanges) |
| Actuation | Manual (lever, gear operator), Pneumatic, Electric |
| Standards Met | ANSI/AWWA C504, API 609, MSS SP-67 (typical, but depends on the manufacturer and intended application) |
| Face-to-Face Dimension | API 609 (standard) |
