The manhole cover is installed on the top of the oil tanker; when the pressure inside the tank rises sharply, theemergency pressure relief device automatically releases the excess pressure.
The manhole cover is installed on the top of the oil tanker; when the pressure inside the tank rises sharply, the
emergency pressure relief device automatically releases the excess pressure. The cover is equipped with an intake/exhaust
valve (P/V valve), suitable for light fuels such as gasoline, diesel, and kerosene. The manhole cover features a reserved
blind hole for installing accessories such as optical sensors, vapor recovery valves, or oil measurement tubes.
Core Function: Emergency Pressure Relief Device Characteristics
1. When the tanker is exposed to high-temperature conditions, the manhole cover can automatically vent the gas inside the
tank to relieve pressure, ensuring transportation safety.
2. Built-in P/V pressure regulating valve
When a pressure difference exists between the interior and exterior of the tank, the system automatically adjusts the air
intake/exhaust process, balancing safety requirements with environmental protection standards.
3. Secondary activation protection design
When activating the upper pressure plate, the internal pressure is released first, effectively ensuring the safety of the operator.
nominal diameter 20 inches
Emergency Start Pressure 21Kpa~35Kpa
Maximum discharge flow rate 7000m³/h
material quality carbon steel
way to install flange connection
operating temperature range -40℃~+70℃
1. The large cover plate is fabricated from galvanized steel sheet through stamping process, offering impact resistance and oxidation resistance.
2. Single or double P/V pressure valve configurations can be selected as needed.
3. The base is manufactured using a roll welding process for sheet metal,facilitating easy welding to the tank body.
4. Equipped with a dedicated key locking mechanism featuring a shockabsorbing rebound bayonet, ensuring stable locking and a leak-proof seal.
