manhole cover, tank  truck  fitting, oil tank truck cover

Description

Manhole is installed on the top of the tank, built-in pressure& vaccum vent & emergency vent.

Characteristics

•  Pressure & vaccum vent, while inside pressure higher than 6-8 Kpa or lower 2-3Kpa  than the outside, will be open to balance the different pressure. While the difference pressure less than -2~6Kpa, the P/V vent will be closed to keep the product not volatilized.

•  Automatic sealing of P/V vent in a roll over situation prevents dangerous and spillage.

•  When the inside pressure is higher 21-32kpa than the outside. The emergency vent will be open automatically to keep tank safe. The vent capacity is 7000M3/h.

•  Two-stage opening allows safe release of residual compartment pressure before fully opening the fill cap.

•  Easy maintenance, convenience, safety.

•  Working pressure:0.6Mpa