Type 12 20 inch aluminum flange type manhole cover | |
1. 24 bolts 2. 135°Max.opening angle of manhole cover 3. 2 auxiliary holes can be used for oil and gas recovery valve and anti overflow probe rod 4. 5083 aluminum alloy plate | |
Technical Specifications: | |
Nominal diameter: | DN500(20″) |
Emergency opening pressure: | 21~35KPa |
Maximum emergency exhaust flow: | 7000m³/h |
Use media: | Diesel and gasoline |
Operating temperature range: | -20℃ ~ 50℃ |
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