Structural features and working principle of hard sealing butterfly valve

Structural features and working principle of hard sealing butterfly valve

Flange three eccentric multi-layer hard seal butterfly valve

1. Flange three eccentric multi-layer hard seal butterfly valve products can be applied to industrial pipelines such as petrochemical, food, medicine, textile, paper, electricity, sewage treatment, water supply and drainage and smelting. It can be used as a control medium to open and close the flow mechanism on a variety of gas, liquid, semi-fluid and micro-particle powder delivery lines or vessels. The flanged three-eccentric multi-layer hard seal butterfly valve can be installed at any position.

2. Flange three eccentric multi-layer hard seal butterfly valve series, with a certain self-cleaning ability, used for steel plants, municipal pipelines and other sewage pipelines can show a variety of advantages, no maintenance, and good sealing, light operation .

Structural characteristics and principle of action

1. The biggest difference between the flange three eccentric multi-layer hard seal butterfly valve and other butterfly valves is that the three eccentric design structure is adopted. The disc mounting center and the rotating center are designed with a strict eccentricity. When the valve is opened at 10 ° C or even fully open, the valve seat sealing surface of the butterfly valve and the butterfly plate are in a non-contact state, and when closed, the butterfly plate is rotated with the valve stem and deflected into the sealing surface of the valve seat to be sealed. Therefore, the service life of the valve is prolonged due to less and no wear during the opening and closing process.

2. The valve seat of the butterfly valve is assembled into a seal by inserting an O-ring or a fluoroplastic as a gasket. Therefore, it has a self-compensating function for temperature difference and wear, ensuring that the butterfly valve is sealed.

3. When the fluid pressure of the butterfly valve line is introduced into the sealing groove of the valve seat, due to the principle of Posson's force component, the sealing force is generated by the joint force of the sealing member and the expansion force of the O-ring. Squeeze the disc to seal the valve. This unique sealing structure creates a greater sealing force as the line pressure increases.

4. The seat of the butterfly valve can be fine-tuned. After the valve has been used for a certain period of time, when the seal ring wears away by itself, the seal ring can be finely adjusted to the required size by the adjusting screw without disassembling the valve, and the compensation can be obtained and The same sealing performance of the new valve.

5.Flange three eccentric multi-layer hard seal butterfly valve series, in addition to manual device, can also be equipped with pneumatic device or electric device to form manual butterfly valve, pneumatic butterfly valve (can be attached with feedback signal and added electric gas valve positioner) and electric butterfly valve, etc. Three categories of six series of products.

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