Hydraulic power is the hydraulic capacity of a pump, that is, the volume of liquid that is shifted to the unit of time. It is measured in cubic meters per hour (m3 / h) for very large pumps or liters per minute (l / m) for small and medium sized ones. There is a formula for converting values:

Closure device that can be automatic or manual, allows only one direction of the flow; in the pumps is used to prevent the flow of the liquid to exit the pipes after the pump is switched off. A ball valve is commonly used in pipes (for gas or liquids), it works by rotating a ball inside the pipe that allows the opening, the closing or the reduction of the flow. Gate valve, unlike balls valve, use a shutter as a closing / opening pipe.