Faith Hill. Faith Hill (born Audrey Faith Perry; September 21, 1967) is an American singer, actress and record producer. She is one of the most successful country artists of all time, having sold more than 40 million albums worldwide. Hill is married to American singer Tim McGraw, with whom she has recorded several duets.
Circulator pumps have numerous applications, but are particularly useful in heating/cooling systems and for hot water return. There are two types of circulating systems - open and closed. Closed systems are typically used for heating/cooling applications, such as underfloor heating or baseboard heating.
An example of a non-positive pump is a centrifugal pump. This type of pump will not pump gases and therefore requires a primer. Ejector Pumps These types of pumps do not use either mechanical pistons or plungers to increase or decrease the pressure but use a fast moving jet of liquid or gas to do the same job. This jet is called a propellant. The ejector pump uses a venture effect within the throat of the pump. At the throat an area of low pressure is created by the fast moving propellant, any movement outside this area being at a higher pressure will flow into the pump. This fluid and the propellant are discharged at the outlet.