一、Characteristics And Usage
The open-close pad of the valve is a round-disk butterfly board and．By rotating around the axis of its own insids of the valve body．carries Out the Open-close or adjusting function It features;1)simple structure，small volume and light weight;2)Quick open-close，labour saving and small and reeistance;3)Good adjustable performance，can be adjusted flexibly within 0～90°，suitable for the pipeline of water supply and drainage．high buildings，firefighting．petroleum，chemical industry，medicine．food etc trades to act as open-close or djustment
二、Product Manufacture And Acceptance Standards
Standards of design:GB12238、API609、JIS B2064；
Structural lenth:GB12221
Standard of flange:GB4216、GB9113、GB9115
Testing standards:GB/T13927、JB/T9092
三、 Product Manufacture And Acceptance Standards
| Nominal diameter |
50～3000 |
| Nominal pressure |
0.25 |
0.6 |
1.0 |
1.6 |
| (MPa) |
Shell test |
0.375 |
0.9 |
1.5 |
2.4 |
| Sealing per- formance |
0.275 |
0.66 |
1.1 |
1.76 |
| Applicable |
Water,Oil,Steam,Sea-water,Nitric acid |
| Working temperature (℃) |
Sealing fale material |
Rubber |
NBR |
Ethylene-pro-pylene rubber |
PTFE |
Silicon rubber |
Fluorub-ber |
| Workina temperature |
0-+60 |
-20-+80 |
-40-+150 |
-40-+200 |
-70-+250 |
-15-+250 |
四、Maaterial For Main Parts
| Name of parts |
Material |
| Body |
Cl,Ductile lron,No25,WCB,Crstainlesgsteel |
| Butterfly board |
Cl,Ductile lron,No25,WCB,Crstainlesgsteel |
| Stem |
Grade．WCB．Crstainlesgsteel |
| Sealing fale |
Neoprene,NBR，EPOM．PTFE |
| Palking |
PTFE，Flexible．Grapnlte.NBR V.washer |
|
