DE8909262U1 - Valve housing - Google Patents

Description

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RSB Aktiengesellschaft

Description Antiatursn housing

The innovation concerns a housing §er.i^ß the generic term of the main claim.

Valves are used within a piping system to shut off and control a medium circulating within it. In order to keep energy losses as low as possible, the valves are designed to have a flow-optimized cross-section.

In the generic valve housing, the aim is to reduce the flow resistance within the housing by reducing flow deflection by slanting the housing seat to the axial housing center line, also known as the pipeline, flow and housing axis, which indicates the main flow direction. The spindle that moves a closure piece runs perpendicular to the flow direction. Since the housing seat and a closure piece that interacts with it still impede the flow, this results in a deterioration of the Zeta value compared to an undisturbed pipe cross-section.

The innovation is based on the task of developing a design of the inner flow-guiding housing contour for a generic valve housing that results in a reduction of the Zeta value.

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This problem is solved according to the characterizing part of claim 1. Due to the housing seat which cuts the axial housing center line at an angle, its downstream edges are at different distances from the annular contact surfaces of the connecting pieces to be connected to the pipes. The reduction in the flow coefficient Σeta aich&z'&t&llitade housing design takes place here at the downstream connecting piece, ie in the connecting piece arranged downstream of the housing seat in the flow direction. Starting from the flow-directing housing seat and in contrast to the known, there is no uniform increase in the flow cross-section.

If the downstream connection piece is considered to be a pipe section consisting of four sector-shaped wall surface parts, then one of the sector-shaped wall surface parts has the design described in the main claim . The sector, which with its flow-guiding wall surface part has the shortest distance between the downstream edge of the housing seat and the contact surface of the connection piece, whose wall surface part runs parallel to the axial housing center line or converges in the direction of the connection piece. Due to the further feature, the discontinuous cross-sectional expansion arranged in the outlet area of the downstream connection piece, a vortex field is generated within the adjacent pipe. This causes a flow to be applied to the wall surfaces within the housing and a flow through the valve with lower losses.

One embodiment of the innovation is described in claim 2. In this case, those sectors which are arranged adjacent to the sector described above and enclose it between them run with their flow-carrying wall surface parts parallel to the axial housing center line or diverging in the direction of the connection piece. In accordance with the respective shape of the housing seat, a flow-carrying

favorable transition to the nominal diameter of the housing. This also ensures that the discontinuous cross-sectional expansion in the area of the contact surface of the connection piece and the pipe to be connected, primarily

in the area of the eector-shaped wall surface part with the j

smallest distance to the housing seat remains.

According to the embodiment of the innovation described in claim 3, the inclined to the axial housing center line

WaiiufiaCuciitSli Untsr SiHSIu Winks! until 2U 25 ;

Depending on the respective nominal diameter of the valve and the inclination of the housing seat, the increase in the angle can be greater towards larger diameters.

According to a further embodiment, the flow cross-section of the downstream connection piece is oval, with the larger cross-sectional axis running transversely to the axis of the spindle. Here too, in relation to the nominal diameter of the housing, the oval flow cross-section within the downstream connection piece is arranged in such a way that there is only a discontinuous cross-sectional expansion in the area of the sector with the smallest distance to the housing seat.

The embodiments of claims 5 and 6 describe the shape and inclination of the discontinuous cross-sectional expansion.

The ring-shaped contact surface of the connection piece can be the sealing surface of a standard flange or the connection point for a welded connection piece. The discontinuous cross-sectional expansion acts as a kind of tear-off edge for the medium escaping from the valve body. Behind this tear-off edge, a

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A vortex field is created in the downstream pipe, which causes the flow to be directed against the sector-shaped wall surface parts in the downstream connection piece. This causes a lower zeta value for the fitting.

An example of the innovation is shown in the drawings and is described in more detail below. The

Fig. i a longitudinal section, the

Fig. 2 a section according to H-II of Fig. 1 and the

Fig. 3 is a view of the downstream outlet nozzle.

Fig. 1 shows a housing (1) whose housing seat (2) intersects the axial housing center line (3) at an angle. A closure piece (4) can be moved into the housing seat (2) by a spindle (5). The connecting pieces (6, 7) are provided with cast-on flanges (8, 9) which have annular contact surfaces (10, 11) for a seal between the housing and the pipe to be connected.

On the downstream connection piece (6), the sector-shaped wall surface part (12) which is parallel to the axial housing center line (3) or converging in the direction of flow has the shortest distance between the housing seat (2) and the contact surface (10). The sector-shaped wall surface parts (13) which run parallel or diverging to the axial housing center line in the direction of the connection piece (6) are located on both sides of the wall surface part (12). A discontinuous, one-sided sickle-shaped cross-sectional expansion (14) is arranged between the contact surface (10) and the wall surface part (12). This causes a trouble-free flow transition into the adjacent pipe (15) shown in dashed lines. The discontinuous cross-sectional expansion (14)

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can run in the plane of the contact surface (10) or, as shown, inclined to the axial housing center line (3).

Fig . 2 corresponds to a cross section according to section H-II in Fig. 1. Starting from the housing seat (2), it can be seen how the wall surface parts (13) diverge in the direction of flow towards the housing center line (3) and enclose the wall surface part (12) between them. There are flow-optimized, continuous transitions (16) between the wall surface parts (12 and 13), see Fig. 3.

Fig . 3 shows a view of the downstream flange (8), its contact surface (10) and the sickle-shaped cross-sectional extension (14) as well as the position of the converging wall surface part (12) and the diverging wall surface parts (13) relative to one another, with continuous transitions (16) being formed between the latter. As can be seen from this view, the flow cross-section (17) has an oval shape, with the longer axis of the oval shape running transversely to the axis of the spindle (5).

Claims (6)

t * 1 · t • f Protection claims 1. Housing of a valve of the lift valve type, with a housing seat arranged obliquely to the axial housing center line and a spindle arranged perpendicular to the axial housing center line for a movable closure piece that can be placed in the housing seat, and with connecting pieces arranged on the housing on both sides of the housing seat, the flow-guiding wall surface part of the flow-through connecting piece being characterized in that a sector-shaped wall surface part (12), within which the shortest distance between the housing seat (2) and the contact surface (10) of the connecting piece (6) can be measured, runs in the direction of the connecting piece (6) parallel or converging to the axial housing center line (3), and that a discontinuous cross-sectional expansion (14) is present between the outer end of this sector-shaped wall surface part (12) and the annular contact surface (10) of the connecting piece (6). 2. Housing according to claim 1, characterized in that a sector-shaped wall surface part (13) running parallel or diverging to the axial housing center line (3) in the direction of the connecting piece (6) is arranged adjacent to the parallel or converging sector-shaped wall surface part (12). 3. Housing according to claims 1 and 2, characterized in that the converging wall surface part (12) is inclined at an angle of up to 25° to the axial housing center line (3). 4. Housing according to claims 1 to 3, characterized characterized in that the flow cross-section (15) of the downstream connection piece (6) is oval, the larger cross-sectional axis running transversely to the axis of the spindle (5). 5. Housing according to claims 1 to 4, characterized in that the discontinuous cross-sectional expansion (14) is designed as a one-sided, sickle-shaped step between the oval outlet cross-section and an annular contact surface (10) of the downstream connection nozzle (6). 6. Housing according to claim 5, characterized in that the wall surface part of the discontinuous cross-sectional extension (14) runs perpendicular or inclined to the axial housing center line (3).