Pressure controlling and/or regulating device for a fluid medium, in particular air or gas

US5645866A · kind A · utility

Assignee

• Battlefeld GmbH · DE

Inventors

• Helmut Eckardt
• Johann Holzschuh · Meinerzhagen, DE
• Jurgen Ehritt · Hilchenbach, DE
• Michael Renger · Meinerzhagen, DE
• Rolf Schwesinger · Meinerzhagen, DE

Key dates

• Filing date: Jul 11, 1995
• Grant date: Jul 8, 1997
• Expiry date: Jul 11, 2015

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C45/1732
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

It is proposed that a pressure control device and/or pressure regulating device (8) be used for a fluid medium, in particular air or gas, preferably nitrogen, which is to be supplied to an injection mold in addition to the molten plastic, this pressure control device and/or pressure regulating device (8) being provided as a stationary, but preferably as a mobile unit between a pressure generator/pressure accumulator (7) and an injection system associated with the injection mold (3), e.g., in a nozzle head or add-on building block. The device has a main line (21) which leads from the pressure generator/pressure accumulator (7) to the injection system (27) and which is switchable by means of valve control only in such a way that it either lets through or blocks the inflow of media, a first branch line (28) leading to a receiver side of a pressure sensor (29) whose other receiver side is sensitive to the pressure of the medium in the injection mold, and a second branch line (30) which can be switched so as to let through or block flow via a valve control influenced by the pressure sensor (29) and, in so doing, forms a media outflow from the injection mold, in particular a return of me…