Valve arrangement

US5230625A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Ralf Sutter · Weinheim, DE
• Lutz Beerstecher · Borex, CH

Key dates

• Filing date: Mar 30, 1992
• Grant date: Jul 27, 1993
• Expiry date: Mar 30, 2012

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61C17/12
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A valve arrangement for controlling a suction stream in a dental suction system, wherein the valve controlling the flow contains a closure element that defines a valve space on one side and a control space on the opposite side. The closure element, such as a membrane, is urged closed when the pressure in the control space is greater than the pressure in the valve space and the movement of the closure element is obtained by actuation of various control valves which control flow in effective lines extending to the control space, which lines have different effective cross sections so as to control the amount of movement of the closure element toward the closed position.