A butterfly valve is a quarter-turn valve used to start, regulate, or stop flow. It consists of a disc mounted on a rotating shaft inside a pipe, which rotates 90° to open or close the flow.
Key Features:
1. Body Material:
Cast Iron (CI) is common for low- to medium-pressure applications.
Can also have ductile iron or carbon steel bodies depending on requirement.
2. Operation Types:
Handle Operated (Manual Lever):
Simple lever for small valves, allows quick quarter-turn operation.
Gear Operated:
Worm gear mechanism to operate larger valves where torque is high.
Provides precise control over disc position.
Actuator Operated (Pneumatic/Electric):
Suitable for automation in process industries.
Can be integrated with control systems for remote operation.
3. Disc and Seat:
Disc may be CI, SS, or coated (epoxy, PTFE).
Seat material can be EPDM, NBR, PTFE for tight sealing and chemical compatibility.
4. Connection:
Wafer type, lug type, or flanged type.
Suitable for ANSI, DIN, or IS standards.
5. Pressure & Temperature:
CI butterfly valves usually handle PN10–PN16 (medium pressure).
Temperature depends on seat material, typically -10°C to 120°C.
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Uses in Industry
1. Water & Wastewater Treatment:
For flow isolation in pipelines, pumping stations, and treatment plants.
Handle large water volumes efficiently.
2. HVAC / Cooling Systems:
To regulate chilled water, hot water, and air flow in HVAC networks.
3. Chemical & Process Industries:
For corrosive or mild chemical liquids.
EPDM or PTFE seat ensures chemical resistance.
4. Food & Beverage Industry:
Disc coatings and sanitary seats allow use in non-toxic liquid pipelines.
5. Power Plants:
For steam cooling water systems or condenser water control.
6. Oil & Gas Pipelines:
Low-pressure isolation of fuels, oil, or gas in pipelines.
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✅ Advantages of CI Butterfly Valve:
Compact and lightweight compared to gate or globe valves.
Quick quarter-turn operation.
Low maintenance and easy installation.
Can be manually, gear, or actuator operated for flexibility.
