Patent ID: 9500171
Filing Date: 2016-11-22
CPC Classification: F02M,Y10T

Claim Text:
1. A pressure regulating valve comprising: a housing having a valve inlet and a valve outlet; and a movable piston disposed in the housing, a position of the piston determined by a selected difference between an inlet pressure and an outlet pressure, the movable piston at least partially defining one or more flow channels between the valve inlet and the valve outlet; wherein when the movable piston is in a fully open position, an axial inlet opening at an inlet end of the one or more flow channels is smaller than an radial depth of the one or more flow channels at the inlet end of the one or more flow channels; wherein the movable piston at least partially defines a single axially-tapered flow annulus extending around a circumference of the movable piston, the axially-tapered flow annulus having a first depth at the inlet end greater than a second depth at an outlet end of the flow channel wherein the movable piston at least partially defines a single axially-tapered flow annulus extending around a circumference of the movable piston, the axially-tapered flow annulus having a first depth at the inlet end greater than a second depth at an outlet end of the flow channel.