The pump provides a substantially constant head or lift when operated at a constant speed.

The decreased pressure causes the dam to act as though the head of dammed water were higher than the head mechanically is.

Rated flow means the head and flow that the manufacturer will guarantee under normal operating conditions

The fluid is pumped at substantially constant head or lift from above a top of the annular space through a return line to the surface of the water.

The reduced pressure zone induces a pressure head which causes transfer of liquid from the source into the reservoir.

an inspection of the loading process (conditions of cartons, filling-up level, etc.)

The impellers increase the radial velocity of the lubricant, and this velocity is converted into a pressure head at the impeller outlet.

Changing load conditions require a pump system that can handle large flows at low head.

The valve is designed to maintain the exit flo rate within a predetermined range regardless of the fluid pressure head within the container.

(b) the pressure head at the openings must be between 0.9 and 2 m.