Small butterfly valve door in the process of using common sense
For 30 years, the United States found that the butterfly valve door, 50 years was introduced into Japan, widely used in Japan to 60 years, while in China is about 70 years later.
In the world today is in commonly 12 mm to god has gradually some gate valve gate valve.
Butterfly valve door and gate valve door contrast with opening and closing time is short, operation for the moment is small, small installation space and light weight.
To DN1000, for example, about 2 t butterfly valve door, and gate valve door about 3.
5 t, and the butterfly valve door easily combined with all kinds of drive assembly, has excellent durability and good sex.
Therefore, at the moment and develop international metal sealing butterfly valve door, cavitation zone decreases, and in recent years, our country is also developing the metal sealing butterfly valve gate, in Japan in recent years also developed cavitation resistance, low vibration, low noise of the comb tooth shape butterfly valve gate.
For 20 years, 80 - metal
But how correct selection should in accordance with the requirements for working condition.
If not beautiful is used to control flow, the flow characteristic and pipe flow resistance has rigorous close relationships, such as two piping valve gate diameter, form etc all don't, and the pipe loss coefficient of trace their differences and the valve gate flow differences may also be very eve.
In addition, the valve inlet side door assembly elbow, form the bias current, torque will be add.
Valve door opening in the center, because the water flow moment impregnation, operators need to be self-locked.