一、 Purpose And Characteristic
The butterfly valve is made on basis of imported products from abroad with improved performance．It has a lot of functions such as linkage between pump and valve as preset program．automatic Control of open and close at long distance，automatic pressure protection without dropping the water hammer．non-vibration disc，small flow resistant and it has adjustable quick-stop or slow stop，when power is cut off suddenly or the valve breaks down，the everlasting momentum of the heavy water hammer will automatically stop the valve quickly and slowly as preset，which prevents water hammer damages and protects the water pumps and pipe network.
The valve is to be widely used in medium and large project pipeline pumps such as water factory，power factory，metallurgy，drainage and etc
二、Adoption Standard
法蘭連接尺寸 API 609
Gray cast iron flange GB4216.2-4216.5-84
Spheroidal graphite cast iron flange GB/T1 7241.6-98
Steel flange GB9115.6-9115.10-88
Structural length：GBl2221-89
Pressure test：GB/T1 3927-92
三、Main Technique Number
Nominal
diameter |
MPa Nominal pressure |
Test pressure |
Appropriate temperature |
Appropriate medium |
| Shell |
Sealed |
| 300-1000 |
2.5 |
3.75 |
2.75 |
|
Water,sea water and sand water |
| 300-1800 |
1.6 |
2.4 |
1.76 |
| 300-2000 |
1.0 |
1.5 |
1.1 |
80~C |
| 1200-2500 |
0.6 |
0.9 |
0.66 |
| 2000-2600 |
0.25 |
0.375 |
0.275 |
四、 Material for Main Parts
| Name |
Material |
| Body |
Gray cast iron, spheroidal graphite cast iron carbon steel |
| Butterfly boar |
Gray cast iron,s spheroidal graphite cast iron，carbon steel |
| valve axis |
Carbon steel(corrosion proof treated surface)，stainless steel |
| Body seat ring |
Stainless steel,copper alloy |
| Disc seal ring |
Quality rubber |
|
