Fluid flow control device

US4431019A · kind A · utility

Assignee

• Baxter Travenol Laboratories, Inc. · US

Inventors

• Clinton V. Kopp · Bismarck, US
• James R. Hitchcock · Barrington, US
• Martin Miller · Markdorf, DE

Key dates

• Filing date: Jun 25, 1981
• Grant date: Feb 14, 1984
• Expiry date: Jun 25, 2001

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/7848
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A fluid flow control device comprises first, second, and third fluid conduits. The first and second conduits are adapted to communicate with separate sources of pressurized fluid. The third conduit includes an inlet portion in direct flow communication with the first conduit and an outlet portion communicating with the atmosphere. A flexible wall forms an interface between portions of the second and third conduits. In response to fluid pressure fluctuations in the second conduit, the flexible wall simultaneously meters the flow communication through both the inlet and outlet portions of the third conduit. The fluid pressure in the first conduit is thereby elevated until substantial equilibrium with the fluid pressure in the second conduit occurs.