Impulse duty cycle valves

A valve comprising:

• a) a valve housing including a fluid inlet and a fluid outlet with a longitudinal axis defined through the valve housing;
• b) an armature mounted within the valve housing for movement relative to the valve housing along the longitudinal axis;
• and
• c) a pintle mounted within the armature for rotational movement about the longitudinal axis relative to the valve housing between a plurality of discrete rotational positions, and for linear movement relative to the valve housing along the longitudinal axis, wherein the pintle and armature are configured and adapted so that repeated impulse actuation of the armature along the longitudinal axis toggles the pintle between a first linear position in which the pintle blocks flow from the fluid inlet to the fluid outlet, and a second linear position in which the pintle allows flow from the fluid inlet to the fluid outlet, wherein the pintle includes an interior flow passage defined therein in fluid communication with the fluid inlet of the valve housing, wherein the pintle includes a pintle outlet for selective fluid communication between the interior flow passage of the pintle and the fluid outlet of the valve housing, and wherein the pintle allows flow through the interior flow passage but prevents flow around the pintle in the second linear position.