The features of centre type butterfly valve are:
1. Structural features: stem axis, butterfly plate centre, body centre in the same position.
2. Soft sealing, sealing materials are mostly rubber, PTFE and other materials, which have very good sealing performance when used in normal temperature and low pressure environment.
3. There are various connection methods, such as clamping type, flange type, clamp type and so on.
4. The disadvantage is that it is not resistant to high temperature, the butterfly plate and the valve seat are always in the state of extrusion, scraping, large distance between the resistance, fast wear.
Flange Valve
The appearance of double eccentric butterfly valve is to make the butterfly valve can be adapted to more occasions, double eccentric butterfly valve service life than the centre-type butterfly valve is longer. The features of double eccentric butterfly valve are:
1. Structural features: the axis of the valve stem deviates from the centre of the butterfly plate as well as from the centre of the body.
2. Seal seat: double eccentric butterfly valve is mostly soft seal, but can also be made into metal seat, which makes double eccentric butterfly valve can be used in high temperature environment.
3. Connection mode, because of the design of the butterfly plate itself, double eccentric butterfly valve is mainly flange connection, not like the ordinary butterfly valve side has a variety of connection forms.
4. Double eccentric design makes the flange open after the butterfly plate can immediately detach from the valve seat, greatly eliminating the butterfly plate and the excessive extrusion of the valve seat, scraping, reducing the opening distance, reducing wear and tear, and improving the life of the valve seat.
5. The disadvantage is that it is not resistant to high pressure and has a certain amount of leakage.
Flange Butterfly Valve
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