Carbon stell manhole cover Management Certification: ISO 9001:2000 Fit EN13317:2002 standard Size:20 inch

carbon steel manhole cover

installed on the top of oil tanker and used for injecting oil,checking gas recovery,mending the internal  inlet.Also can protect the tanker under the emergency. When inject oil,the outside temperature's change will lead the tanker's inside pressure to change.Then the manlid's breathing valve can automatically make the tanker pressure to the normal level.  If some emergency happen ,like the tanker overturn,the breathing valve will automatically close to avoid the tanker's explosion when under the fire condition.

Boay: SS

Handle:SS

Breathing valve: AL  alloy

Insurance deduction:SS

Seal:FPM

Feature: Steel butt plate,pressure vacuum valve can ventilate the oil tanker, different manipulation can set updifferent  pressure.

Pressure vacuum valve has the automatically seal function,can avoid the oil leakage. Before completely open the butt plate,  double opening device can make the tanker's remaining gas to discharge safely.

Size	20 inch
Emergency Breathing valve	10 inch
Pressure resistance	0.254MPA
Emergency open pressure	21KPA-32KPA
Max air flow rate	7000m³ /H
Installment mode	Hooped
Temperature	-20 to 70 °C