DE113231C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

With loaded changeover valves for Water meter connections with locking device, each especially for the large and the small water meter is used to switch from smaller to larger withdrawal quantities (i.e. from the sole activity of the smaller to the beginning of the work of the larger water knife) easily smooth, because the movement of the loaded valve is in the direction of the water flow. In the Moving backwards, however, sinking, there must be a perfect equalization of pressure between the spaces in front of and behind the load in order to keep the load can fall freely and cause the switchover.

The precondition for this is that both water meters are used simultaneously during the switchover are accessible.

This simultaneous accessibility during switching is achieved in the present invention characterized, that the Abschlufsvorrichtungen the entrances to the great and small _and water knives are arranged relative to each other, the small water diameter DAF a "Voröffnen" - in the sense of sinking of the valve - in Abschlufs of large water meter.

The overall arrangement is that which is generally customary according to FIG. 1 of the drawing. In the same means: Gr. WM the large, class WM the small water meter in the bypass and VK the switching valve. By means of the pre-opening of the small water meter, water flows through the bypass and the small water meter, and in this way the pressure equalization takes place, which triggers the sinking of the venfiles. This sinking must take place with such a large quantity that the large water meter can still correctly indicate it. The cross-section of the pre-opening must be so large that the small water-knife can take over this withdrawal amount, which was just continued by the large water-knife, quickly and without hindrance to the process of sinking. In particular, it should be noted that the path of the water through the bypass and the small water meter offers more resistance than the path which the water took before switching through the switching valve and the large water meter. The cross-sections of the closing devices are therefore arranged in such a way that a larger cross-section is open towards the small water knife than towards the larger one, so that when sinking in the same way a larger cross-section is exposed towards the small water knife than towards the larger one slept. FIGS. 2 and 3 of the drawings show an exemplary embodiment. The valve box is divided into the rooms UM O by partitions. A sleeve Ή, open at the bottom in U, with openings h _m to M and h ₀ to O leads through them; The piston K , which is also open at the bottom, is guided in this sleeve, which bears the weight load in its upper part and is provided with openings k _m for controlling the openings h _{m of} the sleeve H and openings k ₀ for controlling the openings h _{0 of} the sleeve H.

The water enters in U; M leads through opening c into the bypass and the small water knife; O leads to the large water meter, so that the openings k _m and h _{m dominate} the small and k ₀ and h ₀ the large water meter.

2 shows the lower position of the piston K. The openings k _m and h _m are opposite one another, while the k ₀ are located below h ₀ ; the small water knife is therefore open, the large one closed. The relevant closing edges - particularly drawn out in Fig. 4 - are 1, 2, 3, 4 in the sleeve H and I, II, III, IV in the piston K \ the length is 1.2 (in the lower position of the piston - left) equal to length IV, 3; the length 1.11 is greater than 1.2. Therefore, if IV opens at 3 when climbing, I has not yet reached 2, and the small knife still remains open. Likewise, on sinking I at 2 already opens the small water meter, if IV at 3 has not yet closed the large one. When sinking, this results in the "pre-opening" of the small water knife before the large water meter is closed. Fig. 3 (and Fig. 4 - right) shows a central position of the piston K within the path of this pre-opening, from which in particular the simultaneous accessibility of the two water meters during the pre-opening can be seen.

In the positions in which edge I rose above edge 2, the small water knife is completely closed; but it does not change the effect of the pre-opening if the small water knife is opened again in the highest position of the piston by z. B. the piston K is only made so long that it no longer covers the openings h _{m in the highest position.}

The difference between the cross-sections open towards the small and large water meter is achieved by making the openings h _m (and k _m ) wider than the openings h ₀ (and Ar ₀ ) [cf. in the drawing width In ₁ m ₂ (and Wi ₃ W ₄ ) ~> O ₁ O ₂ ]. Since the resistances are not the same during the entire process of sinking, the width? 72 ₃ Wi _{4 is} also greater than WJ ₁ Ot ₂ , so that the openings k _m and h _m are wider at the top than at the bottom.

Claims (2)

Patent Claims: ι. Switching valve for connections of larger and smaller liquid meter with loaded valve for the larger one and with Valve for the smaller knife with simultaneous, temporary access to both Knife, characterized in that for the purpose of safe and rapid lowering of the valves if the flow rate is reduced, pressure equalization between the rooms in front of and behind the load as a result of drainage of liquid from the space before the exposure .by means of pre-opening of the small knife can only be carried out through the bypass line into the space behind the load before the large knife is closed can. 2. Switching valve according to claim 1, characterized in that the valve openings to the small water knife are wider than the valve openings to the large water knife, so that when the Valves on each part of the way a larger cross-section after the small water-knife too exposed to sleep after the big knife. 1 sheet of drawings.