LIQUID FLOW CONTROL VALVES

• US 3,590,861 A
• Filed: 07/15/1969
• Issued: 07/06/1971
• Est. Priority Date: 05/05/1969
• Status: Expired due to Term

• Current Assignee: Commercial Shearing Incorporated
• Original Assignee: Chittenden George Edward, Macheill George Park Ferguson
• Inventors: CHITTENDEN GEORGE EDWARD, MACHEILL GEORGE PARK FERGUSON
• Application Number:
  US04/841,957
• Time in Patent Office: 721 Days
• US Class Current: 137/501
• CPC Class Codes: F16K 17/26 operating in either direction
• CPC Class Codes: F16K 3/34 Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve
• CPC Class Codes: Y10T 137/7788 Pressures across fixed choke
• CPC Class Codes: Y10T 137/7792 Movable deflector or choke

Abstract

A pressure-compensated liquid flow metering valve which comprises, arranged in the same bore, a variable orifice afforded by a port obturated by the skirt of a piston biased in a direction to open the port by a spring and an adjustable fixed orifice through which hydraulic fluid from the inlet flows to the same side of the piston as the spring. Inlet pressure acts on the other side of the piston. Thus the variable orifice is automatically varied to maintain a constant pressure drop across and hence a constant flow through the fixed orifice. The fixed orifice may be in the crown of the piston and adjustable by a plate movably mounted on the crown or may be a plate valve extending across the bore.

Claims

1. A pressure-compensated liquid flow metering valve comprising:

a straight bore;

an adjustable valve constituted by a fixed plate extending across the bore and having at least one adjustable orifice therethrough;

a piston slidable within the bore and controlling an exit port in the wall of the bore on the side of the piston remote from the fixed plate;

a spring biasing the piston towards the fixed plate;

an inlet in the wall of the bore between the piston and the fixed plate; and

a passage leading from the bore on the side of the fixed plate remote from the piston to the bore on the side of the piston remote from the fixed plate.

2. A valve according to claim 1 wherein a movable plate is secured to the fixed plate for movement in a plane parallel with the plane of the fixed plate for adjustment of the orifice therethrough.

3. A valve according to claim 2 wherein the movable plate is formed with an opening having a pair of sides which converge to an apex and arranged so that movement of the movable plate relative to the counterelement causes the opening progressively the uncover the orifice commencing from the apex.

4. A valve according to claim 3 wherein the opening is in the form of a V-notch.

5. A valve according to claim 4 wherein the notch is formed in an outer edge of the plate.