OEM Casting Iron Body CF8 Disc Lug Type Butterfly Valve Manufacturers, Factory

A lug type butterfly valve refers to the way the valve is connected to the piping system. In a lug type valve, the valve has lugs (projections) that are used to bolt the valve in between flanges. This design allows for easy installation and removal of the valve.

Product Description

Cast Iron Body

This suggests that the body of the valve is made of cast iron. Cast iron is a common material used in industrial valves due to its high tensile strength and durable performance.

CF8 Stainless Steel Disc

CF8 is a designation for cast austenitic stainless steel. The disc component is engineered using CF8 stainless steel, renowned for excellent corrosion resistance and optimal suitability for critical valve applications.

Quality Control & Testing Standards
Body Test: Tested at 1.5 times the working pressure using water. The procedure is executed post-assembly with the valve disc set to a half-open position, designated as the valve body hydraulic test.
Seat Test: Hydrostatic seat testing conducted with water at 1.1 times the maximum working pressure to ensure zero leakage.
Functional & Operational Test: During final inspection, every valve and corresponding actuator (flow lever, gearbox, or pneumatic actuator) undergoes complete operational open/close cycles without pressure at ambient temperature. This procedure verifies seamless interaction across assemblies, including solenoid valves, limit switches, and air filter regulators.
Industrial Applications & Performance

Lug butterfly valves are primarily utilized for pipeline flow, pressure, and temperature regulation across industrial automated production lines. Key service industries include electric power generation, petrochemicals, metallurgy, environmental protection, energy management systems, and specialized fire protection setups.

Engineered with superior fluid control characteristics, the lug valve facilitates smooth operation and reduced operational torque. Beyond common sectors such as gas extraction, oil refining, chemical processing, and municipal water treatment, these valves serve reliably in cooling water circulation circuits within thermal power plants.

Our valves comply with major international engineering standards including ASTM, ANSI, ISO, BS, DIN, GOST, JIS, and KS. Sizes span DN40 through DN1200, with nominal pressure ratings from 0.1 MPa to 2.0 MPa, and an operational temperature range from -30°C to 200°C. They accommodate non-corrosive and corrosive gases, liquids, semi-fluids, solids, and powders across HVAC installations, municipal supply infrastructure, and processing plants.

Over 16 Years of Advanced Industrial Valve Manufacturing Experience
Technical Specifications & Material Matrix
Size, Pressure Rating & Design Standards
Nominal Size DN40 - DN1600
Pressure Ratings PN10, PN16, Class 150, JIS 5K, JIS 10K
Face to Face Standard API 609, BS 5155, DIN 3202, ISO 5752
Connection Compatibility PN6, PN10, PN16, PN25, 150LB, JIS 5K, JIS 10K, JIS 16K, GOST 33259
Top Flange Standard ISO 5211 direct mounting pad
Standard Material Specifications
Valve Body Cast Iron (GG25), Ductile Iron (GGG40/50), Carbon Steel (WCB A216), Stainless Steel (SS304/SS316/SS304L/SS316L), Duplex Stainless Steel (2507/1.4529), Bronze, Aluminum Alloy
Disc Material Ductile Iron + Nickel Plated, Carbon Steel (WCB A216), Stainless Steel (SS304/SS316/SS304L/SS316L), Duplex Stainless Steel (2507/1.4529), Bronze, or Disc coated with Epoxy / Nylon / EPDM / NBR / PTFE / PFA
Stem / Shaft SS416, SS431, SS304, SS316, Duplex Stainless Steel, Monel
Seat Liner NBR, EPDM, REPDM, PTFE, RPTFE, Viton, Neoprene, Hypalon, Silicon, PFA
Bushings PTFE, Bronze
O-Ring Seals NBR, EPDM, FKM
Actuator Options Manual Hand Lever, Worm Gearbox, Electric Actuator, Pneumatic Actuator
Product Gallery
Frequently Asked Questions
What are the advantages of combining a cast iron body with a CF8 disc?
This design pairs the structural strength, vibration dampening, and cost-efficiency of cast iron with the chemical and rust resistance of CF8 stainless steel, ensuring extended service life in water, gas, and mildly corrosive fluid streams.
What pressure testing procedures are applied to ensure leak-free performance?
Every valve undergoes hydrostatic pressure testing: a shell/body test performed at 1.5 times the maximum rated pressure with the disc half-open, followed by a tight seat leakage test at 1.1 times the operating working pressure.
Which piping flange standards are compatible with these lug valves?
Our lug butterfly valves feature multi-standard drilling compatible with ANSI/ASME Class 150, EN/DIN PN6, PN10, PN16, PN25, JIS 5K/10K/16K, and GOST 33259 flange patterns.
Can these valves be automated with actuators?
Yes. Built with standard ISO 5211 top mounting flanges, these valves easily configure with manual levers, worm gearboxes, pneumatic rotary actuators, and electric quarter-turn automation units.
What media types and working temperature ranges can the valve handle?
Depending on the specific seat and seal selection (NBR, EPDM, PTFE, Viton), the valve accommodates continuous service between -30°C and 200°C for non-corrosive and corrosive liquids, gases, semi-fluids, and powder handling systems.
How does the lug body design simplify pipeline installation and maintenance?
The threaded bolt holes allow the valve to be installed between flanges using separate sets of bolts. This enables downstream line isolation, pipe disassembly, and dead-end service without needing to depressurize the upstream side.

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