Flow control valve assembly

US6311723A · kind A · utility

Assignee

• Multiflo Australia Pty Ltd · AU

Inventors

• David Shipp · Murrysville, US
• Robert K. Turner · Zion, US

Key dates

• Filing date: Jan 6, 2000
• Grant date: Nov 6, 2001
• Expiry date: Jan 6, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/7462
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A fluid flow control valve (10) has a piston (43) in a first chamber (45), urged by a spring (46) to close fluid passages (36) interconnecting the first chamber (45) to a second chamber (51). A fluid level sensor (20) in a container (100) allows fluid to be bled from a downstream side of the first chamber (45), via a bleed passage (45), to enable the piston (43) to move to open the fluid passages (36). When the fluid sensor (20) detects that the fluid level (101) in the container (100) has reached a preset level, the fluid level sensor (20) shuts off flow through the bleed passage (45) and the equalization of the fluid pressure on both sides of the piston (43) in the first chamber (45) enables the spring (46) to move the piston (43) to close the fluid passages (36), shutting off fluid flow through the valve (40).