Appliation: | Vacuum valve, flange type, mounting hole is 4-Ø11. The outlet faces downward and forms a 45°angle in the horizontal direction |
Standard: | GB18564.1-2006. |
Material: | Cast aluminum alloy/stainless steel. |
Items as optional: |
Item No. | Description |
CV06-80PFQ | Internal cylinder opening mode, normally open or normally closed, stainless steel |
CV06-80FQ | Internal cylinder opening mode, normally open or normally closed |
Technical Specification: |
Nominal diameter: | DN80（3″） |
Nominal pressure: | 0.4MPa |
Opening mode: | Pneumatic |
Operating temperature range: | Aluminum alloy：-20℃ ~ 70℃ |
Stainless steel.：-20℃ ~ 200℃ |
The coaming vent valve for fuel tankers is a critical safety device installed around the manhole coaming on the tanker's roof, designed to regulate internal pressure and prevent hazardous overpressure during transportation. Constructed from corrosion-resistant materials like stainless steel or aluminum alloy, it features a precision-engineered diaphragm or float mechanism that responds to pressure fluctuations. When the tank's internal pressure exceeds the safe threshold (typically 2-5 kPa for positive pressure or 0.5-1 kPa for vacuum), the valve automatically opens to release excess vapor or intake air, balancing pressures to avoid tank deformation or leakage.
Equipped with flame arrestors and dust filters, the valve prevents external sparks or debris from entering while ensuring smooth gas exchange. Some advanced models integrate temperature-compensated springs to maintain consistent pressure relief under varying climatic conditions. The valve’s compact design and leak-proof seal (often with fluororubber gaskets) make it suitable for transporting gasoline, diesel, or volatile chemicals. Regular maintenance checks on the valve’s mobility and seal integrity are essential to ensure its reliability in preventing overpressure accidents and complying with transportation safety standards.
