Butterfly valve advantages: 1. Opening and closing convenient, labor-saving, fluid resistance, you can often operate. 2. Simple structure, small size, light weight. 3. Can transport mud, pipe liquid accumulated in the mouth at least. 4. Low pressure, can achieve a good seal. 5. Regulate the performance. Butterfly Disadvantages: 1. The use of pressure and small operating temperature range. 2, poor sealing. Butterfly valve can be divided according to the structure of the bias plate, vertical plate, inclined plate and lever. According to the sealing form can be divided into more sealed and hard seal two. Rubber seals are generally used rubber ring seal, hard seal is usually used metal ring seal. According to the connection type can be divided into flange connection and the clamp connection; According to the transmission can be divided into manual, gear transmission, pneumatic, hydraulic and electric several. Search Keyword: More Valve Technical Articles
Violins we have plywood, solid and flamed three quality.
Plywood violins are cheapest model, and we can make in different paint, it makes different looks and affects the price also.
Solid violins are basic violins, sound is more stable than plywood violins, and different lacquer will make the violins more special.
Flamed violins are for professional violin players. The flame is natural and the sound is prefect, but price is not so high.
solid student violin,Solid Violin,Plywood violins,Flamed violins
FINO MUSICAL INSTRUMENTS COMPANY LIMITED , https://www.finoguitar.com