Ductile iron QT450 handle lug butterfly valve handle lug butterfly valve body is made of ductile iron QT450, which can be made into CLASS150, JIS10K, EN PN16/PN10 flange connection end face
flange connection lug butterfly valve ISO 5211 standard flange connection plate
■ Material
We provide different material configurations for the butterfly plate/valve seat of the convex ear butterfly valve according to different media and working conditions. ASIAV's professional sales engineers provide you with the most professional advice and services based on your specific requirements.
■ Body: The body is cast as a whole with a protruding ear design. Can be used for tube wafer installation and tube end installation. The upper flange connection complies with the ISO5211 standard and is compatible with direct installation of manually operated actuators and pneumatic/electric actuators.
Valve Plate: High strength casting, the valve plate edge is processed into a spherical surface, manually polished or the entire valve plate is nylon sprayed or coated with glue, with low operating torque and long service life of the valve seat. The streamlined plate shape can reduce flow resistance, increase Cv value, and enhance pressure recovery.
Convex ear Butterfly Valve ANSI CL 150/Manual Convex Ear Butterfly Valve 
Handle Convex Ear Butterfly Valve 
Manual Convex Ear Butterfly Valve Convex Ear Butterfly Valve can be made in various colors according to customer needs ■ Seat: The water line is integrally formed on the seat, and no flange gasket is required during installation. The valve seat is designed specifically for loose or welded flanges.
■ Valve stem: Both through shaft and double shaft designs without pins can be provided upon request.
Based on the structural characteristics and axial sealing design of the centerline butterfly valve, the dry shaft design features completely isolate the valve stem from the medium. Instead of highly corrosion-resistant valve stem materials, standard valve stem materials can be used.
The connection between the valve plate and the valve stem is precision machined to ensure the elimination of linkage hysteresis, and all connections are designed to produce maximum strength adhesion,.
For the dual axis no pin design, the precise flat or square stem end of the valve plate drives the valve plate without the need for screws and pins, and the tightly fitting flat or square stem end drives the valve plate, which is a design feature of ASIAV.
Burr butterfly valve blank/casting 
Burr butterfly valve blank/casting ■ Lining: corrosion-resistant phenolic resin/PTFE lining absorbs lateral thrust. Brass can also be used as a lining material.
■ Anti spray design: A retaining ring is installed between the machined valve stem groove and the upper seal to keep the valve stem in place in case of internal failure due to unexpected events.
Primary and secondary seals: This type of seal completely isolates the fluid medium from the valve body and stem. The main seal is obtained through pre compression contact between the shoulder of the valve plate and the inner surface of the valve seat, which is machined and hand polished. The secondary seal is obtained through the interference fit between the valve stem and the valve seat hole. Self regulating "triple O-ring" sealing design ensures bidirectional absolute sealing and prevents foreign objects from entering the valve stem chamber.
■ Installation of actuators: Based on modular concept design, ASIAV actuators include handles, worm gear reducers, pneumatic and electric actuators that can be directly installed on ASIAV clamp type soft seal butterfly valves without any brackets. On site installation is easy, reducing tolerances and overall height.
Handle switch lug butterfly valve with chain lock 
chain lock handle lug butterfly valve handle lug butterfly valve 1. Bidirectional sealing, zero leakage.
Overall design
2. The fully lined rubber valve seat completely isolates the valve body from the medium in the pipeline. Since the valve body is not in contact with the medium, there is no need to consider the corrosion resistance of the valve body material when the medium inside the pipeline is corrosive.
3. Dry shaft design ensures complete isolation between the valve stem and the medium in the pipeline, without considering the corrosion resistance of the valve shaft material. Only standard valve stem materials need to be selected.
4. Low operating torque.
5. Lightweight and easy to install and maintain.
6. The full bore design greatly improves the flow coefficient and meets the efficient flow of the medium inside the pipeline.