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.
The generic term is or Pressure Relief Valve (PRV) or Pressure Safety Valve (PSV) Relief Valve (RV): automatic system that relief by static pressure on a liquid. It specifically open proportionally with pressure increasing.Safety Valve (SV): automatic system that relief by static pressure on a gas.he pressure is small and near the atmospheric pressure. Vacuum Pressure Safety Valve (VPSV): automatic system that relief by static pressure on a gas. The pressure is small, negative and near the atmospheric pressure.