A pressure or vacuum relief valve is installed in vent lines of vessels and equipment and enables the equalization of overpressure or underpressure.
The function depends on which connection socket Connection socket A connection socket is the component which is used to connect the equipment to other components or lines. of the valve is connected to the tank. When connected to a bleed line, the valve compensates for overpressure Overpressure Overpressure refers to an increase in pressure in a system or vessel above the normal operating pressure. ; when connected to a vent line, it compensates for underpressure.
