Type 9 20 inch aluminum flange type manhole cover | |
1. Flanged 2. 24 bolts 3. 135°Max.opening angle of manhole cover 4. 3 auxiliary holes can be used for oil and gas recovery valve, anti overflow probe rod and oil measuring hole 5. Cast aluminum alloy | |
Type 9 items optional: | |
Item No. | Description |
MH03-560 | Outer diameter 560mm, no breathing valve |
MH03-560A | Outer diameter 560mm, 1 internal breathing valve |
MH03-560B | Outer diameter 560mm, 2 internal breathing valve |
MH03-580 | Outer diameter 580mm, no breathing valve |
MH03-580A | Outer diameter 580mm, 1 internal breathing valve |
MH03-580B | Outer diameter 580mm, 2 internal breathing valve |
Technical Specifications: | |
Nominal diameter: | DN500(20″) |
Emergency exhaust diameter: | 10″ |
Emergency opening pressure: | 21~35KPa |
Maximum emergency exhaust flow: | 7000m³/h |
Medium: | Diesel and gasoline |
Operating temperature range: | -20℃ ~ 50℃ |
Operating temperature range under special working conditions: | -40℃ ~ 70℃ |
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