Overview of Butterfly Valves

There are two basic types of butterfly valves in our factory: clamp type Fluorine-lined Butterfly Valve ， D73 series eccentric butterfly valve adopts a two-piece valve body combination. The valve seat and the valve body lining are integrated. When the valve is working, only the full plastic valve seat and the plastic lining disc plate are in contact with the medium. The valve can withstand the medium corrosion introduced by the lining materials. It adopts a four stage sealing structure and is equipped with a temperature resistant and aging resistant SI rubber elastic gasket at the sealing surface to achieve zero leakage of the medium.
The D41 flange connection valve evolved from the above model and check valve Fully lined butterfly valve with D71 disc plate made of stainless steel and semi lined.
structural characteristics
The center line butterfly valve is concentric with the valve seat within a 360 ° circumference (center line), with bidirectional sealing function, and pressure and flow can be freely adjusted:
eccentric PTFE lined valve The cam effect of two-dimensional eccentric products will generate sufficient sealing pressure in the sealing pair, and the sealing effect becomes more ideal with the increase of working pressure;
Four level loading elastic seal ensures zero leakage inside and outside the valve:
The special transition curve at the circumferential connection of the shaft head and disc plate and the reasonable interference fit of the valve seat;
The end face of the shaft head adopts an elastic O-ring and a rigid washer at the shoulder of the shaft, combined with an elastic rubber pad;
The radial direction of the shaft adopts a combination of O-ring and metal pad;
The valve seat is embedded in an elastic valve body groove;
Adopting adjustable elastic pin positioning, accurate positioning and simple structure. (The use of O-rings is a safety measure to prevent accidental leakage)
The flange linked double eccentric butterfly valve is suitable for high-pressure applications.
The design specifications follow GB/T12238, API609, and MSSSP-67 standards. Butterfly valves use disc plates that rotate together with the valve stem as opening and closing components to achieve valve opening, closing, and flow regulation. Butterfly valve and Fluorine lined DC globe valve In addition to its role in cutting off and stopping flow in pipelines, sealing performance has become the main indicator for evaluation in recent years and has been favored by the market. In addition, rotating 90 ° can achieve the opening and closing process, and due to the approximately equal action of the medium on both sides of the rotating shaft, the torque is opposite, so the opening and closing torque is small.

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