Patent · US Expired

Invertable pump for liquid media

US4776498A · kind A · utility

35Cited by

13References

10Claims

0Family size

Assignee

Ing. Erich Pfeiffer GmbH & Co KG · DE

Inventors

Leo Maerte · Sipplingen, DE
Michael Wolter · Steckborn, CH

Key dates

Filing date	Apr 23, 1986
Grant date	Oct 11, 1988
Priority date	—
Expiry date	Apr 23, 2006

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB05B11/1067
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The thrust piston pump of a delivery apparatus for liquid media and the like is provided with a valve arrangement in the suction passage. The valve arrangement has two valve seats acting in opposing manner and is associated with a single common valve body. This permits a rapid transfer of the valve body into the closed position engaging on the valve seat, particularly during operation in an inverted position. In addition, the discharge passage has a mechanically openable discharge valve which can be simply opened by displacing the actuating head of the pump with respect to a collar of the pump piston.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.