DE1028846B - Device for controlling a flowing medium through a second medium - Google Patents

Description

The invention relates to a device for controlling a flowing medium through a second medium depending on the pressure of one or both, guided in separate lines Media by means of a valve arranged in one line.

There is already a control device for gases known in which a medium duixh the pressure of a other medium is controlled and the lines for the two media are connected to two by a membrane separate chambers are connected. The control chamber is an unchangeable one Exposed to liquid pressure, and there is no possibility of the membrane opposing the liquid pressure to relieve and to achieve a crossing of the membrane over the normal closing stroke.

There is also a device known in which two chambers separated by a membrane with are each acted upon by a pressure medium. Here, however, is the membrane separating the two chambers rigidly connected to the shut-off valve, so that here, too, there is no over-travel beyond the closing stroke the membrane can be achieved.

Finally, a gas valve is known in which on the two chambers separating membrane from one The controlled medium acts on the side and the controlling medium acts on the other side. The controlling medium is, however, branched off from the controlled medium itself via a branch line, and the control takes place in such a way that a negative pressure is created in the same by connecting the control chamber with the outside air generated and thus the shut-off valve for the controlled liquid is opened. Same effect but also occurs if, for example, the outlet line of the control chamber becomes sealed or the like. The control fails. This can have very dire consequences under certain circumstances, e.g. B. Overflow and Cause the fuel oil to ignite in the case of oil firing. Differs from these known bodies the device according to the invention is characterized in that one of the two lines is connected to one of the two Chambers is connected, of which the chamber belonging to the controlled line opposes the the direction of flow of the medium from the membrane against a restoring force to open valve +5 contains, which acts on the incoming branch of the controlled line, which is known per se. At the same time, the membrane is under the action of a force in the same way as the valve restoring force acting, additional restoring force, which the diaphragm after closing the valve from the attack surface the restoring force lifts to cause a back suction in the outgoing branch of the controlled line to effect.

contraption

for controlling a flowing medium through a second medium

Applicant:

Maschinenfabrik C. Eitle,
Stuttgart-Fellbach

Serge Ziegler, Stuttgart-Bad Cannstatt,
has been named as the inventor

The device is suitable for a wide variety of purposes, but especially for installation in the Fuel and compressed air lines in oil firing systems, when the system is switched off, d; H. when sinking the control pressure in the control chamber, first the oil flow in the controlled fuel line blocks, whereupon the membrane creates a suction effect on the fuel outlet line through its additional path exercises and sucks back the oil residue in the burner and thus prevents that from the heat radiation Any remaining oil in the burner becomes resinous and thus leads to blockages and malfunctions.

In addition, if the control line leaks, the shut-off valve and thus the flow rate will be reduced closed.

The drawing schematically illustrates an embodiment of the invention in the operating position.

The device comprises a housing 1 which is divided by a membrane 2 into two chambers 3, 4, of which the chamber 3 serving as a control chamber z. B. is connected to a compressed air line 5 with a shut-off valve 6, while the chamber 4 in the controlled line, for. B. a fuel line is located.

The controlled chamber 4 contains a connector 9 into which the supply line 14 opens \ * entil 10, which is under the action of a return spring 11 closes in the flow direction of the controlled medium. 13 is the outlet line of the controlled Chamber 4.

The membrane 2 is under the influence of a further return spring 12, which the return spring 11 concentrically surrounds and acts in the same sense as this. During the closing path of the valve 10 is limited by its seat, is for the membrane 2

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a stop 7 is provided in the control chamber 3. This makes it possible that the membrane 2 in pressureless state of the control chamber 3 under the action of its return spring 12 one over the Closing path of the valve 10 can cover the path going beyond, in the controlled chamber 4 generates a negative pressure.

The return spring 11 is supported against a plate 15 provided on the valve stem, while the restoring spring 12 against reinforcing plates 8 preferably arranged on both sides of the membrane 2 supports.

The device works as follows: When commissioning flows one medium, z. B. compressed air, in the control chamber 3, where it is on the membrane 2 acts, overcomes the force of its return spring 12 and it against the abutment plate 15 of the Valve 10 pushes. On the further path of the membrane 2, the valve 10 is opened and the path for the flow of the controlled medium from the supply line 14 via the valve 10 and the controlled Chamber 4 released into the outlet line 13.

When the pressure in the control chamber 3 drops, the return springs 11 and 12 first cause the Closure of the valve 10, whereby the flow of the controlled medium is interrupted. Moved on the membrane 2 continues alone up to the abutment against the stop 7, where they have a suction effect on the only exerts open outlet line 13 of the controlled chamber.

30th

Claims (3)

Patent claims: 1. Device for controlling a flowing medium through a second medium depending on the pressure of one or both of the media guided in separate lines by means of a valve arranged in one line, with two chambers separated from one another by a membrane, each exposed to pressure characterized in that one of the two lines (5 or 13, 14) is connected to one of the two chambers (3 or 4j, of which the chamber (4) belonging to the controlled line (13, 14) is opposite to the direction of flow of the .Mediums of the membrane (2) against a restoring force (11) to be opened valve (10), which acts on the incoming branch of the controlled line, the .Membrane (2) at the same time under the action of a in the same sense as the Veiitilrückstellkraft (11) acting, additional restoring force (12) is available, which lifts the membrane (2) after closing the valve (10) from the contact surface (15) der_ restoring force (H) to i m outgoing branch (13) of the controlled line to cause a back suction. 2. Device according to claim 1, characterized in that that in the control chamber (3) a stop (7) is provided which the through the Restoring force (12) caused diaphragm travel limited. 3. Apparatus according to claim 1 and 2, characterized in that the restoring forces (11, 12) Helical springs are provided in the chamber (4) belonging to the controlled line, which are preferably arranged concentrically. Documents considered: German Patent No. 600 738; Austrian patent specification No. 115 934: Swiss patent specification No. 232195; French Patent No. 809 829: British Patent No. 613 429. 1 sheet of drawings © 809 507/205 4.5 &