Human Immunodeficiency Virus, commonly known as HIV, is a virus that affects the immune system by destroying white blood cells known as CD4 cells. These cells are responsible for fighting disease.
Servovalve, Hydraulic-Description. A hydraulic servovalve is a servo (see Servo, Hydraulic â Description) with a device (either flapper nozzle or jet pipe) used to position the servo. The term electrohydraulic servovalve is often used because servovalves are controlled through an electrical signal.
A gate valve is a type of valve used to prevent the flow of liquid in a plumbing system. It is primarily designed to be completely open or completely closed.Consequently, gate valves are rarely used as a means of regulating flow. gate valve is a type of valve used to prevent the flow of liquid in a plumbing system. It is primarily designed to be completely open or completely closed.