DE3126260A1 - Residual pressure device on a gas cylinder valve - Google Patents

Abstract

The residual pressure device on a gas cylinder valve prevents soiling of the interiors of gas cylinders and of their contents, by maintaining a residual pressure during emptying to prevent emptying of the entire contents. This prevents the penetration of contaminating foreign gases from the atmosphere. It must be possible to use the residual pressure device on all gas cylinder valves, even those with very small threaded connections. It contains a spring-loaded non-return valve for removing gas in a tubular body which is screwed to the gas cylinder valve. A further non-return valve is connected in parallel to the latter valve and is connected to the same gas duct in the tubular body. The second non-return valve closes when acted upon by superatmospheric pressure from the inside and is opened by superatmospheric pressure from the outside. It takes the form of a tube valve with a valve tube above a bore which is arranged in the tubular body at right angles to the gas duct. The residual pressure device is suitable for general use with gas cylinders, especially for valuable or pure gases.

Description

Drägerwerk Aktiengesellschaft

Moislinger Allee 53-55, 2400 Lübeck

Residual pressure device on the gas cylinder valve

The invention relates to a residual pressure device on the gas cylinder valve, according to the generic term of claim 1.

Before filling gas cylinders with valuable or pure gases, the containers must be used to avoid contamination evacuated from the atmosphere or purged with the fill gas before filling begins can. This is cumbersome. The effort can be avoided if in that with a residual pressure device equipped container or the container valve, a residual pressure remains, i.e. the container does not can be completely emptied.

On a known valve for preventing the contamination of valuable gases in steel cylinders are two Spring-loaded check valves arranged in an approach on the screw-in socket of the flask valve. The approach becomes mechanical when the valve is screwed into the steel cylinder unclaimed. One check valve is located in a channel that is only used for gas extraction. It closes against the removal direction when the pressure falls below a certain level

of the gas in the gas cylinder. The other check valve sits in another channel, the channel
is connected in parallel for gas extraction. It opens the way to the inside of the bottle under the overpressure of the refill and closes under the overpressure inside. Both channels with the check valves are arranged spatially next to each other »The resulting diameter for the required flow cross-sections
the approach with the valves exceeds the core diameter of the screw-in thread of small valves
Screwing in would not be possible. (DE-PS 835 969)

The object of the invention is a residual pressure device
on the gas cylinder valve, which is used on all gas cylinder valves as defined by the standards DIN 477 Part 1 and
DIN 3174 are specified, is applicable. It must therefore also be possible to use it on the valves for gas bottles with the smallest possible thread connection.

The task is solved according to the indicator
of claim 1. With the feature of claim 2 is
a further reduction in the diameter of the residual pressure device is possible. The design of the check valve as a hose valve enables one

the smallest diameter of the residual pressure device. The two check valves connected in parallel In any case, ensure that there is residual pressure in the gas cylinder when the gas is withdrawn.

The residual pressure device according to the invention can be retrofitted to gas cylinder valves at any time. It also serves as a water protection pipe, as required by DlN 3174.
5

An embodiment of the invention is shown in the drawing and is described below.

The residual pressure device 1 is with the connection thread 2 in the threaded connection piece 3 of the gas cylinder valve screwed in. The diameter allows it to be inserted into the gas cylinder connection 4th

The residual pressure device 1 is contained in a tubular body 5 the two check valves connected in parallel and connected to the gas duct 6 a and b 8. A sintered filter 9 protects the check valve a 7 from contamination.

The check valve a 7, it is a loaded with a spring 10 ball 11 on a Crater piece 12, receives a residual pressure in the gas cylinder 4 via the spring pressure when the gas is withdrawn.

This prevents the ingress of contaminating foreign gases from the atmosphere.

The check valve b 8, it is a hose valve with a valve hose 13 over a bore 14 in the tubular body 5, which is connected at a right angle to the gas guide 6, closes with the Gas pressure in the gas bottle 4 and opens when the filling gas is introduced. The valve hose 13 is arranged in a recess 15. It thus remains within the diameter of the tubular body 5.

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Claims (3)

Claims (^ l. pressure device on the gas cylinder valve with a spring-loaded check valve in one that is used to remove gas from the gas cylinder Channel and a check valve connected in parallel to it, which is under the internal overpressure closes and opens by external overpressure, characterized in that the under internal overpressure closing check valve b (8) a hose valve with a valve hose (13) over one at right angles to the gas duct (6) Bore (14) is in the tubular body (5). 2. residual pressure device on the gas cylinder valve according to claim 1, characterized in that the valve hose (13) is arranged in a recess (15) of the tubular body (5). 3. The residual pressure device on the gas cylinder valve Claim 1 and 2, characterized in that a sintered filter (9) is attached to the crater piece (12) of the spring-loaded check valve a (7) connected is.