FLOW REGULATING DEVICE

• US 3,722,858 A
• Filed: 12/15/1970
• Issued: 03/27/1973
• Est. Priority Date: 12/29/1969
• Status: Expired due to Term

• Current Assignee: Masashi Sugimoto, Yoshiki Moriyama
• Original Assignee: Masashi Sugimoto, Yoshiki Moriyama
• Inventors: Sugimoto, Masashi, Moriyama, Yoshiki
• Primary Examiner(s): Rosenthal, Arnold
• Application Number:
  US05/098,311
• Time in Patent Office: 833 Days
• Field of Search: 251/209,208,175,212 137/625.3
• US Class Current: 251/209
• CPC Class Codes: F15B 21/045 Compensating for variations in viscosity or temperature
• CPC Class Codes: F16K 5/0407 with particular plug arrangements, e.g. particular shape or built-in means
• CPC Class Codes: F16K 5/10 Means for additional adjustment of the rate of flow

Abstract

A flow regulating valve for hydraulic systems including a housing having inlet and outlet ports and a port crossing bore, a sleeve mounted in the bore of the housing and provided with a first opening communicating with the inlet port and a second opening on the opposite side communicating with the outlet port, the walls of the second opening forming knife edges at the inner surface of the sleeve and sloping outwardly to the outer surface of the sleeve, a throttle spool mounted in the sleeve and provided with a cavity of decreasing size communicating at its larger end with the first opening of the sleeve and at its smaller end with the second opening of the sleeve, and means for relatively moving said sleeve and throttle spool to adjust the size of a sharp-edged orifice defined by overlap of the smaller end of the cavity with the second opening of the sleeve.

Claims

1. A flow regulating valve for pressure fluid systems, comprising a housing having inlet and outlet ports and a bore crossing said ports, a sleeve mounted in said bore and provided with a first opening in one side communicating with said inlet port and a triangular opening in the opposite side communicating with said outlet port, said triangular opening having tapered walls sloping outwardly toward the outlet port and terminating in knife edges at the inner surface of the sleeve, a throttle spool mounted movably in the bore of said sleeve and having a cavity of decreasing size passing through the spool for communicating at its larger end with said inlet port and said first opening of the sleeve, and at its reduced end with said outlet port and said triangular opening of the sleeve, said cavity terminating in its reduced end in a hole of circular shape, and means for relatively moving said throttle spool and sleeve with respect to one another to form a sharp-edged orifice of adjustable size defined by the overlap of said circular hole at the reduced end of said cavity with said triangular opening of the sleeve, said throttle spool being urged toward the outlet port side of the sleeve by fluid pressure acting essentially on said cavity of the throttle spool.

2. A flow regulating valve according to claim 1, wherein said bore of said housing is cylindrical, said sleeve being also cylindrical with a cylindrical bore therein, said throttle spool being a cylinder, and said means for relatively moving said sleeve and throttle spool comprises means for rotating one with respect to the other.

3. A flow regulating valve as set forth in claim 1, wherein said sleeve is fixed unmovably within said housing and said throttle spool is movable within said bore of said sleeve.

4. A flow regulating valve according to claim 1, wherein said circular hole at the reduced end of the throttle cavity is defined by a knife edge.

5. A flow regulating valve according to claim 4, wherein said cavity of said throttle spool is cylindrical for a major portion of its volume and decreases in size for a minor portion of its volume terminating in said circular hole, the knife edge of said circular hole being formed by an annular slope tapering inwardly toward said outlet port of the housing.