DED0014911MA

DED0014911MA -

Info

Publication number: DED0014911MA
Authority: DE

Description

BUNDESREPUBLIK DEUTSCHLANDFEDERAL REPUBLIC OF GERMANY

Tag der Anmeldung: 24. April 1953 Bekanntgemacht am 14. Juni 1956Registration date: April 24, 1953. Advertised on June 14, 1956

DEUTSCHES PATENTAMTGERMAN PATENT OFFICE

In Gasspürgeräten werden Ventile verwandt, die den Luftstrom steuern und als sogenannte Plättchenventile ausgebildet sind. Das Ventilplättchen wird dabei durch eine Feder gegen einen Dichtungsrand gedrückt. Die Federspannung läßt sich beliebig einstellen, so daß der Öffnungsdruck auf jeden gewünschten Wert reguliert werden kann. Die Ventilplättchen werden dabei aus Glimmerlamellen hergestellt, die aus natürlich gewachsenen ίο Kristallen parallel den Gleitebenen herausgespalten werden. Diese Plättchen sind starr und bei mechanischer Beanspruchung oder bei Wärmebeanspruchung nicht deformierbar. Die Verwendung der Glimmerventile hat den Nachteil, daß bei natürlich gewachsenen Kristallen Fehlstellen auftreten können, so daß die Oberfläche nicht völlig plan ist. Die Folge sind Undichtigkeiten. Die Verwendung von Metallplättchen scheidet aus, da sie nicht völlig starr und meistens formierbar sind und außerdem korrodieren können.In gas detection devices, valves are used that control the air flow and are called so-called Plate valves are formed. The valve plate is thereby by a spring against one Seal edge pressed. The spring tension can be adjusted as desired, so that the opening pressure can be regulated to any desired value. The valve plates are made from mica fins made of naturally grown ίο crystals that are split out parallel to the slip planes will. These platelets are rigid and exposed to mechanical stress or thermal stress not deformable. The use of mica valves has the disadvantage that defects occur in naturally grown crystals so that the surface is not completely flat. The result is leaks. The usage metal platelets are ruled out because they are not completely rigid and mostly malleable and can also corrode.

Die Erfindung erstrebt, die Nachteile der bekannten Ventilplättchen zu vermeiden. Die Erfindung besteht darin, daß als Ventilplättchen plan geschliffene Glasplättchen mit einem mindestensThe invention seeks to avoid the disadvantages of the known valve plates. The invention consists in the fact that flat-ground glass plates with at least one valve plate

609 530/390609 530/390

Claims

D 14911 IX / 421 one-sided film coating are used. Glass plates of the type of microscopic cover slips, for example, can be used as flat-ground glass plates. Glasses ground flat in this way are sufficiently rigid and sufficiently flat. The existing risk of breakage is reduced by the film coating so that the platelets can serve as valve platelets. Plastic, lacquer or any suitable, adhesive, tough film material can serve as the film cover. Polyvinyl acetals are particularly suitable as pressure-sensitive adhesives. An organic varnish can also serve as a pressure-sensitive adhesive. A further embodiment of the invention consists in that the valve plate consists of two or more flat glass plates which are connected by organic pressure-sensitive adhesives. The platelet veritile according to the invention ensure absolute tightness even with the smallest pressure differences. Another advantage is that the glass surfaces do not tend to stick because of their surface properties. The platelets are also resistant to the effects of temperature and humidity. The platelets are not prone to corrosion. \ P Λ T E N T A N S P R I "'". H F .:

1. Valve for gas detectors, characterized in that that as a valve plate flat glass plate with at least one sided Serve foil coating. . , ■

2. Valve according to claim 1, characterized in that the flat glass plate on one side is coated with an organic varnish.

3. Valve according to claim 1 and 2, characterized in that the pressure-sensitive adhesive is polyvinyl acetals serve.

4. Valve according to claim 1 to 3, characterized in that that the valve plate consists of two or more flat glass plates that connected by organic pressure sensitive adhesives.

Referred publications:
German patent specifications No. 462205, 750651.