Thrust piston pump with double valve assembly

US6227415A · kind A · utility

Assignee

• Ing. Erich Pfeiffer GmbH · DE

Inventors

• Stefan Ritsche · Radolfzell, DE
• Esther Amann · Radolfzell, DE

Key dates

• Filing date: Jun 17, 1998
• Grant date: May 8, 2001
• Expiry date: Jun 17, 2018

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B05B11/1026
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An inlet valve (10) of a dispenser (1) or thrust piston pump, for highly reliable and speedy valve function in all vertical or inclined positions of the dispenser (1) includes, nearer to the pump chamber (20), a valve ball (35) operating in response to pressure and, further away from the pump chamber (20), a valve ball (36) subject to the force of gravity. Ball (36) pushes ball (35) out of its seat (33) in the event that it is firmly seated in the seat (33) due to a vacuum in the reservoir (9) when the dispenser (1) is turned upside down. The seats (33, 34) for the two valve balls (35, 36) are formed by a radially deformable wall (54), which can be tightly and sealingly supported against balls (35, 36).