Regulator Valves are valves that change the pressure of the fluid. The pressure change occurs as the position of the valve allows some of the fluid to exhaust. These valves are widely used in transmissions to control the line pressure. These are also used to control the signal shift points. This valve has a spring that holds the valve in a position until the fluid pressure is enough to compress the spring. At that time, the valve moves and allows some fluid to exhaust. Once the fluid begins to exhaust, the pressure on the valve decreases. The valve remains in the exhausted position until the fluid pressure is not enough.