DE20119942U1 - butterfly valve - Google Patents

Description

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butterfly valve ; . &igr;

The invention relates to a butterfly valve which is used in pipelines to shut off gaseous and liquid media and in which the valve plate is pivoted radially and axially out of the seat ring. However, the invention is also applicable to ball valves of a similar design.

, Butterfly valves in which the flap disc is arranged at a distance from the spindle and around which the seat is pivoted, are designed to have a free and possibly possible passage cross-section through the butterfly valve. However, it has been shown that the actuating forces are very high, particularly when opening the flap until the flap disc has pivoted away from the seat ring. The cause is the pressure of the medium, which presses the flap disc onto the seat ring until the first gap between the seat ring and flap disc opens and also a little later until the pressure is equalized between the pressurized side of the butterfly valve and the non-pressurized side of the butterfly valve. Abrasion and leaks can occur. ;

, In order to avoid these problems, butterfly valves have been developed in which the valve plate is lifted off the seat ring before it is actually swung out of the seat ring and only then swings out of the seat ring area. This avoids high actuating forces and also mechanical damage when the butterfly valve is actually opened. .

DE OS 2748201 describes that in a throttle valve the valve body pivots out of its position before it rotates to open. This is achieved by means of pins and differently shaped slots at the end of the operating rod, which are also arranged in the area of the space in which the medium is located. The operating rod is also arranged in the center line of the valve housing.
According to DE PS 3508318, a rotary and swiveling closing part is arranged in a butterfly valve. The rotary and swiveling movement of the closing part is achieved by a pin arranged at the top of its rear side being guided in a spatially twisted slot which is provided at the end of the switching rod. The switching rod is in turn moved axially by a piston-cylinder unit. The entire mechanism for generating the swivel and rotary movement is arranged in the space of the butterfly valve in which the medium is located. The switching rod is also arranged in the center line of the valve housing.

In the description of DE PS 68917661 of the flap valve, the valve body can be rotated when it is removed from the valve seat. This is done by a valve spindle that is connected to an outward-facing drive shaft and generates the tilting movement via an elongated hole and a pin. The valve spindle is mounted in a ball joint and has anti-twist joints at both ends. The switching rod is also arranged in the center line of the valve housing.

The disadvantage of the arrangement described in DE OS 2748201 for generating the opening movement of the throttle valve is that the pins and differently shaped slots at the end of the operating rod are complicated and can tend to jam due to their position in the area in which the medium is located. Since the pins and slots in particular are arranged at the free end of the operating rod, which is no longer guided, this construction is not as stable as possible. Because the operating rod is also arranged in the center line of the valve housing, the valve body scratches at least in the first

Opening phase at its lower end along the seat and increased operating forces and wear can occur.

The designs of the butterfly valve according to DE PS 3508318 have disadvantages because the pins and differently shaped slots at the end of the switching rod are complicated and can tend to jam due to their position in the area of the space in which the medium is located. Since the pins and slots in particular are arranged at the free end of the switching rod, which is no longer guided, this construction is not as stable as possible; the switching rod is also weakened because the slot penetrates it. Because the switching rod is also arranged in the center line of the valve housing, the valve body scrapes along the seat at its lower end, at least in the first opening phase, and increased actuation forces and wear can occur.

:, Even more difficult with regard to the attachment and operation of the flap valve design according to DE PS 68917661 is the arrangement of the valve body and its attachment to the valve spindle, which is connected to an outward-facing drive shaft and generates the tilting movement via an elongated hole and a pin. The arrangement is made even more complicated because the valve spindle is mounted in a ball joint and has torsion-proof joints at both ends. Due to its position in the area of the space in which the medium is located, jamming can occur! Because the ball joint and a torsion-proof joint of the valve rod are arranged on a free end that is no longer guided, maximum stability of the construction is not achieved. Because the valve spindle is also arranged in the center line of the valve housing, the valve body scratches along the seat at its lower end, at least in the first opening phase, and increased operating forces and wear can occur.

The object of the invention is to create a butterfly valve that is used in pipelines to shut off gaseous and liquid media, which is constructed in a stable manner in that the components that generate the flap rotation movement cannot be jammed by the medium and guarantee maximum stability. Furthermore, the flap plate should be easy to move from the beginning of the opening movement and should immediately lift off the seat ring and not experience any scratching or wear.

According to the invention, the object of creating a butterfly valve for shutting off gaseous and liquid media in pipelines is achieved in that a flap plate is placed in a sealing manner in a housing in which a seat ring is arranged on one side in the passage coaxially to the housing axis. The flap plate can be pivoted on flap arms around a control shaft and lifted off the seat ring and is mounted at its lower end via the lower flap arm with a spherical joint bearing in a joint bearing bush. The control shaft and the joint bearing are arranged eccentrically with respect to their coaxial center lines at an outward-facing distance from the vertical center line of the housing. The control shaft is mounted in the neck of the housing and in this area contains at least one control groove on a thickened part which runs on the jacket surface. A torsion bolt which is firmly inserted in the neck of the housing engages in the control groove in such a way that play allows movement of the control groove towards the torsion bolt. The control groove consists of an upper axially running part, which in rounds in a thread-like part, jiberg^ht .and then again .by rounds in an axially

&eegr; in a thread-like part overlooked .and then again through

running part. The selector shaft has at its lower end, which is in the ring-shaped plate bearing with clearance, two parallel bevels that run at an angle to its center line and are spaced apart from each other.. ,

The upper part of the flap plate is connected to the ring-shaped plate bearing via the upper flap arm. The plate bearing contains bolts that are slightly offset in height and opposite one another, as a chord to the inner diameter, against which the bevels of the switching shaft rest.

An embodiment is explained in the following drawings. The drawing shows:

Fig. 1: The butterfly valve in central section. . ■ . ,

Fig. 2: a side view of the butterfly valve.

Fig. 3: Section B-B through the butterfly valve.

Fig. 4: a three-dimensional view of the butterfly valve.

Fig. 5: the section AA through the neck of the butterfly valve in an enlarged view. ^&lgr;

Fig. 6: The spindle of the butterfly valve rotated by 45° around its axis in an enlargement.

According to Fig. 1, in the butterfly valve for shutting off gaseous and liquid media in pipelines, a seat ring 9 is arranged coaxially to the housing axis in a housing 1 on one side in the passage, onto which a flap plate 6 is placed in a sealing manner. The flap plate 6 can be pivoted on flap arms 7 about a control shaft 2 and lifted off the seat ring 9 and is mounted at its lower end via the lower flap arm 7 with a spherical joint bearing 10 in a joint bearing bush 11.

According to Fig. 2 and Fig. 3 it can be seen that the switching shaft 2 and the spherical bearing 10 are arranged eccentrically E with respect to their coaxial center lines at an outwardly pointing distance from the vertical center line of the housing 1.

Again according to Fig. 1 it can be seen that the control shaft 2 is mounted in the neck 12 of the housing 1 and in this area contains at least one control groove 3 on a thickened part, which on the outer surface

runs. .

Mainly according to Fig. 5 but also in Fig. 4 it can be seen how a torsion bolt 13, which is firmly inserted in the neck 1.2 of the housing 1, engages in the control groove 3 in such a way that play allows movement of the control groove 3 towards the torsion bolt 13.

According to Fig. 6 and Fig. 1, the control groove 3 consists of an upper axially extending part, which passes into rounded sections in a thread-like part and then again through rounded sections into an axially extending part. The switching point 2 has at its lower end, which is inserted into the annular plate bearing 8 with clearance, two parallel bevels 4, which run at an angle to their center line and are separated from each other.

have a distance. .

According to Fig. 1, the upper part of the flap plate 6 is connected to the annular plate bearing 8 via the upper flap arm 7. In the plate bearing 8, bolts 5 are inserted, slightly offset in height and opposite one another as a chord to the inner diameter, against which the bevels 4 of the switching shaft 2 rest.

List of reference symbols used:

1 Housing 2 Shift shaft 3 Control groove 4 Slope 5 bolt 6 Flap plate 7 Flap arm 8th Disc bearing 9 Seat ring 10 Spherical bearings 11 Joint bearing bush 12 Case neck 13 Torsion bolt

Eccentricity/ eccentric

Claims (1)

1. Butterfly valve, in which a seat ring 9 is arranged in a housing 1 on one side in the passage coaxially to the housing axis, on which a flap plate 6 is sealingly seated and the flap plate 6 can be pivoted on the flap arm 7 about a control shaft 2 and lifted off the seat ring 9, wherein it is mounted at its lower end via the lower flap arm 7 with a spherical joint bearing 10 in a joint bearing bush 11, characterized in that, - the selector shaft 2 and the spherical bearing 10 are arranged eccentrically E with respect to their coaxial center lines at an outwardly pointing distance from the vertical center line of the housing 1; - the control shaft 2 mounted in the neck 12 of the housing 1 contains in this area on a thickened part at least one control groove 3 which runs on the outer surface, - in the control groove 3, a torsion bolt 13 which is firmly inserted in the neck 12 of the housing 1 is soaped so that it has play and allows a movement of the control groove 3 to the torsion bolt 13, - the control groove 3 consists of an upper axially extending part, which passes into roundings in a thread-like part and then again through roundings into an axially extending part, - the switching point 2 at its lower end, which is inserted in the annular plate bearing 8 with play, contains two parallel bevels 4 which run at an angle to its center line and are spaced apart from each other, - in the annular plate bearing 8, which is connected to the flap plate 6 by the upper flap arm 7, slightly offset in height and opposite as a chord to the inner diameter, bolts 5 are inserted, against which the bevels 4 of the switching shaft 2 rest.