Valves for isolating or depressurizing during an emergency. EBVs are installed at strategic locations to isolate/shutdown equipment, or to enable the depressurizing, removal, or displacement of the flammable material inventory of process vessels. Power operated EBVs, typically electric motor or double-acting piston type operators, may be Type C or Type D.
EBV Type "C" are typically large line size valves (10 in. or larger) that are installed at least 25 ft (7.5 m) from the equipment to be isolated, and located no higher than 15 ft (4.5 m) abovegrade. The actuating pushbutton(s) and position indicating lights for such a valve are installed locally at the valve actuator.
EBV Type "D" valves have actuating pushbutton(s) and position indicating lights located away from the valve at a readily accessible and safe location, at least 40 ft (12 m) horizontally away from the potential leak source and such that it can be operated from grade. Type "D" valves are selected for installations where the valve is not readily accessible in an emergency situation.