DE20309537U1 - Check valve assembly is formed by annular disc with central bore and one-way valve with valve plate covering central bore in first position and which inside cage fastened to disc is movable into second position opening central bore - Google Patents

Abstract

The check valve assembly is formed by an annular disc (20) with a central bore (22), and which has a one-way valve (24). The one-way valve comprises a valve plate (28) covering the central bore in a first position and which inside a cage fastened to the annular disc is movable into a second position opening the central bore. Several guide rods (32,34) standing perpendicularly to the annular disc and spaced around the central bore provide stops to limit the travel of the valve plate in the second position.

Description

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TER MEER STEINMEISTER & PARTNER GBR PATENT ATTORNEYS - EUROPEAN PATENT ATTORNEYS

Dr. Nicolaus ter Meer, Dipi.-Chem. Peter Urner, Dipl.-Phys. Gebhard Merkle, Dipl.-Ing. (FH) Mauerkircherstrasse 45 0-81 679 MUNICH Helmut Steinmeister, Dipl.-Ing. Manfred Wiebusch

Artur-Ladebeck-Strasse 51 D-3361 7 BIELEFELD

EHLPOl /03 / G

St/zs/ec 18.6.2003

Helmut Ehlert

Am Forthof 9 33758 Schloss Holte-Stukenbrock

CHECK VALVE ARRANGEMENT

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Helmut Ehl«ft I ' · I ·· j · · ·'. EHLPOl /03/G June 18, 2003

CHECK VALVE ARRANGEMENT

The invention relates to a check valve arrangement.

In hot water heating systems in particular, where the warm water is circulated by convection or a circulation pump that is not a forced-feed pump, it is usually necessary to prevent the heating medium, usually water, from flowing back, i.e. circulation in the "wrong direction" by using a check valve. While the water heated by the heater usually tends to rise in the flow line through convection, possibly supported by a circulation pump, and thus pushes the cooled water in the return line back to the boiler, this mechanism is often no longer clearly present, especially in the transition period, i.e. when the flow temperatures are relatively low. This is particularly true in widely branched systems in which there may also be particularly strong cooling in some areas. Many hot water heating systems therefore require a check valve in the flow line to ensure that the intended direction of circulation is not reversed.

The installation of check valves in the supply line of a system of the type mentioned makes it necessary to dismantle a section of the supply line and modify it in such a way that space is created for the insertion of a check valve.

These adjustments have to be carried out manually and are therefore expensive. Added to this are the costs of the check valve itself.

The invention is therefore based on the object of creating a simply constructed check valve arrangement, the assembly of which does not require any significant changes to an existing supply system and which can therefore be installed cost-effectively.

To achieve this object, a check valve arrangement of the present invention is formed by an annular disk with a central bore to which a one-way valve is assigned.

Helmut Ehlptt JJ · · ·· . . I J ·. EHL POl/03/G June 18, 2003

A check valve arrangement according to the invention therefore does not require a complete check valve of the usual type, which has its own housing with its own screw connections. Rather, the invention proposes a check valve arrangement reduced to a minimum, which has a type of washer with a central hole as a carrier and which can be inserted into a suitable screw connection position in the flow system. To do this, it is only necessary to loosen a union nut provided in a screw connection position and insert the washer according to the invention between the union nut and the counterpart provided with a screw thread. The union nut can then be tightened again. The space required is minimal. A significant change to the pipe system into which the check valve arrangement according to the invention is inserted is not necessary.

There are numerous one-way valve systems that can be assigned to the central bore of the annular disk used according to the invention. Balls, plates, conical valve bodies, etc. can be considered as valve bodies.

In a preferred embodiment, a plate-shaped valve body is provided as the valve body, which covers the central bore of the disc in a first position and which is movable within a cage fastened to the annular disc into a second position which exposes the central bore.

The valve body plate is preferably circular, and on the annular disc at a distance from the central bore and thus on the circumference of the valve body plate there are arranged a plurality of guide rods which are perpendicular to the annular disc and on which stops are attached to limit the travel of the valve body plate in the second position.

A concentric guide shaft can be fixed to the valve body plate, and the stops of the guide rods can be designed such that they serve as a guide in this guide shaft during its axial displacement and thus during the movement of the valve body plate between the first and second positions.

Helmut Ehleft: * * &Ggr; : · · · · · . ..''..»»■■»

EHL POl /03 /G 18.6.2003

Preferably, the stops are formed by the inwardly bent ends of the guide rods.

A helical compression spring can be provided between the stops of the guide rods and the valve body plate, which slightly preloads the valve body plate in the direction of the closed position, i.e. the first position.

In the following, preferred embodiments of the invention are explained in more detail with reference to the accompanying drawings.
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The single figure shows an axial section through a pipe connection with an integrated check valve arrangement according to the invention.

The pipe connection according to the invention serves to connect a first pipe 10 shown below with a second pipe 12 shown above. The first pipe 10 has an upper end flange 14 which is provided with an external thread. The second, upper pipe 12 also has an end flange 16 which is gripped from above by a union nut 18. The union nut 18 is equipped with an internal thread which corresponds to the external thread of the end flange 14 of the lower pipe 10. The two end flanges 14, 16 of the two pipes 10, 12 can therefore be clamped together by the union nut 18.

Details of this pipe connection, which can also be replaced by another, conventional pipe connection, are not important in this context. Seals are not shown.

According to the invention, an annular disk 20 is inserted between the two end flanges 14, 16 of the conventional pipe connection. The disk 20 has a central bore 22. A one-way valve, designated 24, is assigned to this central bore 22. It should be assumed that the one-way valve 24 only allows an upward flow in the direction of the arrow 26 shown in the drawing.

Helmut Ehlert «t*! !!;··· · EHL POl/03/G 18.6.2003 **«« «« »« «» .. .. *

The one-way valve 24 comprises a circular plate 28 as the valve body, from which a concentric guide shaft 30 extends, which projects upwards in the drawing. On the circumference of the central bore 22 there are several, at least three, guide rods 32, 34, which project vertically from the annular disk 20. The upper ends of the guide rods 32 are bent inwards in an arc shape and form stops 36, 38 for the valve body plate 28 with their ends. This plate 28 is therefore movable between a first position, which is shown in the drawing and in which it closes the central bore 22, and a second position in which the plate 28 hits the stops 36, 38.

In order to prevent the plate 28 from tilting, the upper bent ends of the guide rods 32, 34 are shaped in such a way that they surround the guide shaft 30 from all sides and form a sliding guide for it. This is immediately apparent from the drawing. The plate 28 can therefore be lifted off its seat, in which it closes the central bore 22, without tilting.

As long as the water in the pipes 10, 12 rises in the direction of the arrow 26, the plate 28 is lifted by the water pressure from its closed position into the second raised position at the stops 36, 38. If the direction of flow threatens to reverse, the plate 28 lies back on its seat at the central bore 22. This closing movement is supported by a helical compression spring 40, which slightly pre-tensions the plate 28 in the direction of the closed position.

Claims (6)

1. Check valve arrangement formed by an annular disc ( 20 ) with a central bore ( 22 ) to which a one-way valve ( 24 ) is assigned. 2. Check valve arrangement according to claim 1, characterized in that the one-way valve comprises a valve body plate ( 28 ) covering the central bore in a first position, which is movable within a cage ( 32 , 34 , 36 , 38 ) fastened to the annular disc into a second position exposing the central bore ( 22 ). 3. Check valve arrangement according to claim 2, characterized in that the plate ( 28 ) is circular, and that on the annular disc ( 20 ) at a distance from the central bore ( 22 ) a plurality of guide rods ( 32 , 34 ) are arranged which are perpendicular to the annular disc ( 20 ), on which stops are attached for limiting the travel of the valve body plate ( 28 ) in the second position. 4. Check valve arrangement according to claim 3, characterized in that a guide shaft ( 30 ) of the valve body, which is mounted concentrically on the valve body plate ( 28 ), is slidably guided between the stops ( 36 , 38 ) of the guide rods ( 32 , 34 ). 5. Check valve arrangement according to claim 4, characterized in that the stops ( 36 , 38 ) are formed by the inwardly bent ends of the guide rods ( 32 , 34 ). 6. Check valve arrangement according to claim 5, characterized in that a helical compression spring is arranged between the valve body plate ( 28 ) and the stops ( 36 , 38 ).