Global distribution of maternal causes of. death. A maternal death is defined as the death of a. woman while pregnant or within 42 days of. termination of pregnancy, regardless of the. site or duration of pregnancy, from any cause. related to or aggravated by the pregnancy or. its management.
There are two types of control systems namely: 1  Open loop control systems (non-feedback control systems) 2  Closed loop control systems (feedback control systems)
Control Valves. A combination of a valve and an actuator is usually referred to as a control valve. The system which provides automatic control of flow consists of a valve, a valve actuator, and a sensing device. Two types of controllers and actuators commonly used in irrigation are electric and hydraulic. Globe and angle valves are commonly adapted for automatic control due to the tight shutoff of these valves.