The minimum pressure required to produce flow through a valve.

100% duty cycle is defined as continuous operation without any damage occurring. For intermittent duty cycle (<100%), alternate energized and de-energized state at regular intervals to allow the valve to completely cool down to room temperature.

F = active concentration / total concentration

A diagram showing how flow can be directed using a particular valve. (See the "Flow Patterns" box below for further explanation.)

Valve stays closed in de-energized state; opens when energized.

Valve stays open in de-energized state; closes when energized.

The difference between the inlet and the outlet pressure through a valve. The outlet pressure is lower than the inlet pressure due to the restriction caused by the valve.

Has three ports. Depending on the particular valve, all three ports may be open, two ports may be open, or all ports may be closed.

Has a single inlet port and a single outlet port. Brass Valves Factory Selection Guide