DE3241069A1 - Adjustable shut-off device especially for the short-circuit line of a pump - Google Patents

Description

Adjustable shut-off device, especially for the short-circuit line of a pump.

The invention relates to an adjustable shut-off device in particular a short-circuit line of a pump up to a certain adjustable medium pressure. to keep closed, which shut-off device comprises a housing that is received in the short-circuit line is and in which a valve seat and a cooperating valve are arranged, which valve through a spring is urged towards its closed position with respect to the valve seat, which by the spring external pressure is adjustable.

Such a shut-off device can, for example, be added to a circulation pump in a heating system. When radiator taps If a central heating system is closed, the amount of water transported by the circulation pump will decrease. In the extreme case, all of the lines can even be closed. In the case of manually operated taps, this will be the case do not occur often, but this fact must be taken into account when using thermal radiator taps.

If the circulation pump rotates without moving water, the water in the pump can get so hot that it can be damaged the pump could occur.

In connection with this, a short-circuit line with a shut-off device is generally used passed over, which can open at a certain pressure, so that part of the displaced by the pump Water can get directly into the return line.

The fact that the Centrifugal pump delivered pressure will be higher when

the amount of water displaced becomes smaller.

With such known systems the difficulty is that the shut-off device must be adjusted so that it is closed when all the radiator taps are completely closed stand open, whereby the circulation pump delivers a certain pressure and pumps a certain amount of water, while when turning off one or more taps the The shut-off device in the short-circuit line must be opened. To the pressure at which the shut-off device is opens, to be able to set, one has to know about various data of the system, such as the pump diagram, the capacity of the System and the pressure loss in the piping system. In particular, the pressure loss can be difficult to calculate and can change after a while, e.g. due to dirt deposits in the system's piping.

There is therefore a risk that the shut-off device in the short-circuit line will already exist when the System opens too early or that this will be the case after some operating time.

When changing an older system, the data required for the correct setting of the shut-off device are necessary.

The invention now eliminates these disadvantages by providing a shut-off device which is characterized by is that through the wall of the housing one of Secondary line extending outside the housing is provided which opens into the housing in such a way that it is kept closed by the valve as long as the valve keeps the shut-off device closed while im essentially simultaneously with the opening of the shut-off device due to the increasing pump pressure, the secondary Line is opened in such a way that medium can flow out of the housing through the line to the outside of the housing, with a tap in the line to close the line

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after the pressure has been set, the shut-off device must open.

When arranging a shut-off device according to the present invention in the short-circuit line, this will be adjusted to be at a high pressure to open and the system will be put into operation with all the radiator taps fully open - the circulation pump then delivers a certain pressure at which the shut-off device in the short-circuit line is closed remain. The pressure exerted by the spring on the valve of the shut-off device is now reduced until it is the shut-off device opens, the secondary line then also being opened at the same time or almost at the same time the line of which the tap is also in the open position. So it will be Water will flow out of the pipe and you will now increase the spring pressure again until there is no more water out of the pipe flows. You then know that the shut-off device in the short-circuit line is back in the closed one Position is reached. The tap in the secondary line can then be closed and the system is ready for use.

Of course it is possible to increase the pressure of the spring, which keeps the valve closed, to a certain extent, like this that the shut-off device is not in the short-circuit line when a single radiator tap is closed already opens. A certain increase in the working pressure of the pump is of course permissible.

During the operation of the system you can always see the correct action of the shut-off device in the short-circuit line Control the pump without having to have data on the systems.

32-1069

Because when adjusting the shut-off device the influence the opened secondary line must be as small as possible to the flow conditions, the diameter of this Line or the maximum passage of the tap connected to it must be as small as possible, just paying attention to this is that there is no risk of the line or the tap becoming clogged. . .

The invention will now be illustrated by means of one in the drawing Embodiment explained in more detail, with Figures 1 and 2 schematically a section through two show possible embodiments of the cock.

In both figures is the one resulting from the circulation pump Line with 1, the return line with 2 and the one to this Lines adjoining parts of the short-circuit line indicated by 3a and 3b.

Located between parts 3a and 3b of the short-circuit line the shut-off device 4 in FIG. 1 and 5 in FIG. 2.

The shut-off device 4 of FIG. 1 comprises a housing 6 with a bottom 7, in which the bottom of the part 3a of the short-circuit line opens out, while in the side wall of the Housing 6 opens into part 3b of the short-circuit line. The one provided with the cock 9 also opens into the bottom 7 secondary line 8 off. The lines 3a and 8 are both closed by the valve 10, which is through the spring 11 is loaded, the other end of which rests against a plate 12 which is connected to the adjustment knob provided adjusting screw 13 is connected. The screw 13 is rotatably received in the upper wall 15 of the housing 6, so that the pressure of the spring 11 can be adjusted.

In the shut-off device 5 of FIG. 2 are corresponding

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Parts indicated with the same reference numerals, wherein the only difference is that the housing 16 of the shut-off device 5 works in a slightly different way than in the embodiment is designed according to FIG. 1, while the secondary line 7 is arranged such that its The heart line coincides with the heart line of the valve 10, so that this will be more centrally loaded.

It will be clear that the exemplary embodiments are only shown schematically and that many changes have been made can be without falling outside the inventive idea.

The valves and valve seats can be used, for example, to obtain certain Flow conditions, etc. may be conical, but all these possibilities will be clear to the person skilled in the art be.

Claims (2)

I ¹ AT F. NTANSPRÜ CHE 1J Adjustable shut-off device, in particular to keep a short-circuit line of a pump closed up to a certain adjustable medium pressure, which shut-off device comprises a housing which is received in the short-circuit line and in which a valve seat and a valve cooperating with it are provided, which valve is operated by a spring after its closed position with respect to the valve seat, the pressure exerted by the spring being adjustable from the outside, characterized in that a secondary line is provided through the wall of the housing which extends from outside the housing and which is thus in the housing opens out so that it is kept closed by the valve as long as the valve keeps the shut-off device closed, while at the same time or almost simultaneously with the opening of the shut-off device as a result of the increasing pump pressure the secondary line in such a way is opened so that medium can flow out of the housing via the line to the outside of the housing, wherein in the Line a tap for closing the line after adjusting the pressure is provided, wherein the The shut-off device must open. 2. Shut-off device as described and / or shown in the drawing.