EMERGENCY PRESSURE RELIEF VENT

When internal pressure in the tank goes up, due to product filling or vapor development, the set pressure will be increased, accordingly, the pressure disc will be opened and discharge the gas to atmosphere. The set pressure can be arranged according to storage tank requirements and the breather valve will be reset when internal pressure returns to below set pressure. The vacuum disc is similarly maintained in the closed position. When excessive pressure builds within the storage tank, the emergency pressure valve hinged cover begins to open at the predetermined set pressure, relieving excess pressure. When the overpressure has dissipated the cover reseats onto the base. The hinge mechanism prevents misalignment and provides an accurate reseat.