What are the characteristics of the valve disc structure of manual butterfly valve

The valve disc of Manual Butterfly Valves is a key component in the valve, and its structural design directly affects the performance and service life of the valve.

material selection

The valve disc is usually made of corrosion-resistant and wear-resistant materials to ensure that the valve can operate stably under various working conditions. Commonly used materials include:

Stainless Steel: Suitable for highly corrosive media, with good corrosion resistance and mechanical strength.

Aluminum Alloy: Lightweight and has good corrosion resistance, suitable for some occasions that require reducing the valve mass.

Cast Iron: Suitable for general industrial applications and provides good mechanical strength.

Valve disc shape

The valve disc is usually round or oval in shape to accommodate the pipe structure inside the valve body. This design helps reduce the resistance of fluid passing through the valve and improves the fluid dynamics of the valve.

connecting shaft

The valve disc is usually equipped with a connecting shaft, which is connected to the operating handle through the valve stem. The design of the connecting shaft needs to ensure its stability and reliability during valve movement. Usually, the connecting shaft will pass through the center of the valve disc to ensure that the valve disc does not deflect when rotating.

seal edge

The outer edge of the valve disc is the key part for sealing with the valve seat. The outer edge of the valve disc is usually designed in a certain shape to ensure that it can fully fit the valve seat when closed to achieve an effective seal. This design can prevent fluid leakage and improve the sealing performance of the valve.

Valve disc bearing

In order to reduce friction when the valve disc rotates, the valve disc is usually equipped with bearings near the connecting shaft. These bearings can reduce the friction loss of the valve disc and improve the flexibility and stability of the valve.

Locating pin or pin groove

In order to ensure that the valve disc can accurately stop in the open or closed position when rotating, the valve disc is usually designed with positioning pins or pin grooves. These positioning devices enable the valve disc to be positioned accurately during movement, preventing leakage or blockage caused by inaccurate valve disc position.