Valve arrangement and positive-displacement pump

US5318414A · kind A · utility

Assignee

• Humanteknik AB · SE

Inventor

• Stig Lundback · Vaxholm, SE

Key dates

• Filing date: Dec 7, 1992
• Grant date: Jun 7, 1994
• Expiry date: Dec 7, 2012

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B43/021
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A positive displacement pump, particularly a liquid metering or batching pump, includes a fluid inlet, a pump chamber of variable volume, an outlet through which fluid leaves the pump chamber, a driven injection member for repetitive displacement of fluid from the pump chamber, and a valve which functions to open and close a flow passage connecting the inlet with the pump chamber. The flow passage is formed by a gap which extends around at least the major part of the circumference of the pump chamber and which can be open to a height which varies from a smallest value at the ends of the gap to a largest value at a location between the circumferential ends of the gap. The valve includes a valve member which extends along the flow passage and which is pivotally mounted on a pivot adjacent the circumferential ends of the passage.