초록 ▼

A flow control valve includes a piston moveable in a cylindrical chamber between an inlet opening and an outlet opening. The piston head has a maximum diameter smaller than the wall of the chamber to define a fixed orifice. The opposite end of the piston has a sleeve which partially blocks the outle

A flow control valve includes a piston moveable in a cylindrical chamber between an inlet opening and an outlet opening. The piston head has a maximum diameter smaller than the wall of the chamber to define a fixed orifice. The opposite end of the piston has a sleeve which partially blocks the outlet opening depending upon the position of the piston in the chamber which in turn depends upon the pressure differential across the fixed orifice.

대표청구항 ▼

[ Having described my invention, I claim:] [1.] A constant flow rate regulating device, comprising:a housing having an internal cylindrical side surface (22), an inlet opening (16), and an outlet opening (18);a hollow support tube (28) located within said housing in axial alignment with said outlet

[ Having described my invention, I claim:] [1.] A constant flow rate regulating device, comprising:a housing having an internal cylindrical side surface (22), an inlet opening (16), and an outlet opening (18);a hollow support tube (28) located within said housing in axial alignment with said outlet opening;a flow control piston (40) slidably supported on said support tube, said piston comprising a valve sleeve (42) slidable on said tube and an enlarged head (46), said enlarged head having a circular edge in close proximity to said internal side surface of said housing to form an annular throttling orifice that exerts a pressure drop on the fluid flowing from said inlet opening into the annular space surrounding said valve sleeve;spring means (62) within said support tube biasing said piston in the direction of said inlet opening;plural flow control ports (34) in said support tube communicating the annular space surrounding said valve sleeve with said outlet opening;said valve sleeve having a downstream edge movable across said flow control ports to progressively reduce the port flow area as the flow control piston moves away from said inlet opening; anda reverse flow conduit disposed in the support tube from the inlet opening to the outlet opening for passing a second fluid in the reverse direction as a first fluid passes from the inlet opening toward the outlet opening.