一、 Construction And Usage
The open-close mounted pad of the valve is round。The disk rotating around the axis of its own inside 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．1abour saving and small fluid resistance;3)Good a 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 adjustment
二、Product Manufacture And Acceptance Standards
Standards of design:GB12238、API609、JIS B2064；
Structural lenth:GB/T15188.2
Standard of flange:GB4216、GB9113、GB9115
Testing standards:GB/T13927、JB/T9092
三、 Main Technique Number
| Nominal diameter |
4042000 |
| Nominal pressure |
0.25 |
0.6 |
1.0 |
1.6 |
| Test pressure (MPa) |
Shell strength |
0.375 |
0.9 |
1.5 |
2.4 |
| Sealing performance |
0.275 |
0.66 |
1.1 |
1.76 |
| Applicable motiumsss |
Water,Oil,Steam,Sea-water,Acidssss |
| Working temperature |
Rubber |
NBR |
Ethylene-pro-pylene rubber |
PTFE |
Silicon rubber |
Fluorub-ber |
| 0.60 |
-204+80 |
-40-+150 |
-40- +150 |
-70-+25 |
-15-+250 |
四、Maaterial For Main Parts
| Name of parts |
Material |
| Body |
Cl,Ductile lron,No25,WCB,Crstainlesgsteel |
| Butterfly board |
l,Ductile lron,No25,WCB,Crstainlesgsteel |
| Stem |
Grade．WCB．Crstainlesgsteel |
| Sealing fale |
Neoprene,NBR，EPOM．PTFE |
| Palking |
PTFE，F(xiàn)lexible．Grapnlte.NBR V.washer |
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