DE1042319B - Double check valve - Google Patents

Description

GERMAN

The invention relates to a double check valve which z. B. for central heating systems for water that partly designed for gravity and partly for pump operation, is suitable.

It is known to arrange and design an automatic valve so that it is when the pump is at a standstill does not have to be pushed by the low water pressure in the open position, but by itself under the influence the dead weight of a closure piece opens, so a one-way valve with the same flow, whereby the processes opening and closing depend only on the strength of the currents.

In another embodiment, a plate is provided as the closure part, in which for guidance on both sides at least three guide wings are attached, which are guided in a hole. This training requires great precision in terms of manufacture, leaves between the guide wing and the guide surface of the Housing only has a small amount of play and is therefore not very suitable for water because even the smallest contamination the reason is that the plate gets stuck in the guide, tilts or canted.

An independent multi-way valve with the possibility of accelerating the flow is also known or to increase the operating pressure by means of a pump, with the main and secondary inlet facing each other, the common exit between the two goes off to the side and between the entrances a to Shutting off one or the other serving closure piece is arranged and guided. At a Valve with three connections, a closure piece is provided which is held in holders by means of a type of spindle is slidably guided in the connecting piece.

Finally, another version has become known in which on a central spindle as a flat Discs formed locking pieces are provided.

The double check valve according to the invention with two inlets and one outlet, each with a valve seat at each entrance and a closure piece, which is under the greater of the two inflow pressures on the opposite valve seat is pressed, consists in that the guide for the closure piece a pin or sleeve which is permanently attached to the housing and is located centrally to the two seats which moves the piece provided with corresponding holes closure.

Further features relate to the design the guide, the locking piece, the housing and the arrangement of the lines.

The advantage of the training according to the invention is primarily that the two connections You do not have to face each other for the entrances. Through this this results in a space-saving arrangement. This double check valve

Applicant:

Ekkehard Wienholtz, Mannheim,
Leibnizstrasse 25th

Wolf Schöne, Mannheim,
has been named as the inventor

Guide is particularly useful in an installation in which the locking piece has a vertical movement executes, since the closure piece can be made very easily and only with little friction moves, whereby it can be moved even with small pressure differences.

In the drawing, the invention is shown using an exemplary embodiment. It shows
Fig. 1 the valve in section,

^a 5 Fig. 2 a diagram of the valve assembled with a pump and the required section from a corresponding system.

According to FIG. 1, the valve 1 has an upper valve seat 11 with upwardly extending struts 19 and is connected to the central hub 18 and a centrally and vertically arranged pin 17 or sleeve, the latter serving as a guide element for the locking piece 13 moving up and down and counteracts a lateral displacement of the same or its individual parts. When the guide element 17 is firmly connected to the housing, this has the advantage that its weight when lifting of the closure piece 13 does not act against the current coming from a pump and thus the for Regulation required pressure difference can be smaller.

The plates 14, 15 and the spacer 16 of the closure piece 13 can either be fixed to one another be connected, or the spacer 16 is with the upper, 14, or the lower plate 15 or firmly connected to neither of them. These individual parts are either by gravity or by additional pressure of a spring 21 or by the pump pressure against each other and against the seats 11 or 12 pressed.

To dampen the impact of the upper plate 14 against its seat 11, a resilient seal 20 be attached or the plate itself consist of a flexible material.

«09 661/159

Claims (10)

Furthermore, the arrangement of a closure piece 22 is provided, for example a ring pushed onto the pin 17. As a result, the clearance existing in the bore of the upper plate 14 or the seal 20 between the latter and the pin 17 is covered. Finally, part of the pressure additionally generated by a pump can be generated as dynamic pressure by designing the secondary line 5 according to Fig. 2 and the lower connection II of the valve with a smaller cross-section than that of the main line entering through connection I. The lower connection II can also be kept smaller in cross section than the lower valve seat 12, the interior space between the two expanding conically so that part of the dynamic pressure additionally generated by a pump is converted into static pressure in it. The free cross-section of the lower valve seat. 12 can be made larger, smaller or just as large as the free cross section of the upper valve seat 11. In the system according to Fig. 2 a double check valve 1 according to Fig. 1 is provided, in which the medium either enters the valve through port I or port II and in any case exits through port III. The valve 1 can be designed in a corner shape or in a straight-through shape, the latter for horizontal installation. A booster pump 2 is connected at II. Particularly if the latter is designed in a corner shape, a compact arrangement can be produced, if necessary with the interposition of valves 6, 7. The pump 2 sucks through the secondary line 5 branched off from the main line 3. When the pump 2 is switched on, the closure piece 13 is raised and closes from the upper valve seat 11. When the pump 2 is switched off, the closure piece 13 or its individual parts fall down as a result of gravity and, if necessary, the force of the spring 21, the lower plate 15 resting on the lower valve seat 12. Godparents τ λ ν s ρ ιϊ c che: 1. Double check valve with two inlets and one outlet, one valve seat on each Entrance and a closure piece, which is under the greater of the two inflow pressures on the opposite located valve seat is printed, characterized in that the guide for the Closure piece (13) a firmly attached in the housing, centrally located to the two seats Pin (17) or sleeve is on which the locking piece provided with corresponding holes is located (13) moves. 2. Valve according to claim!, Characterized by a hub (18) for fastening the guide element (17), which is located above the sealing surface of the Upper valve seat (11) is provided and is connected to this by struts (19). 3. Valve according to claim 1 or 2, characterized in that the closure piece (13) from two plates (14, 15) and a spacer (16) between the two, for example in the form of a sleeve, exists, whereby this only with the upper or the lower or with neither of the two plates (14, 15) is firmly connected. 4. Valve according to one of claims 1 to 3, characterized in that on the guide element (17) a closure piece (22) is provided, which between the guide element (17) and the plate (14) or a seal (20) existing clearance. 5. Valve according to one of claims 3 and 4, characterized in that the upper plate (14) consists of elastic material or carries a seal (20) made of such a material. 6. Valve according to one of claims 1 to 5, characterized in that a spring in the housing (21) is arranged and acts on the locking piece (13) that the locking piece in the rest state (17) covers one of the seats (12). 7. Valve according to one of claims 1 to 6, characterized by such an arrangement of the Connections that the entrances (I and II) above and below and the common exit (III) are on the side. 8. Valve according to claim 7, characterized in that the lower connection (II) through which the enters the flow conveyed by a pump (2), has a smaller free cross section than that upper connection (I). 9. Valve according to claim 8, characterized in that the lower valve seat cross section (12) is larger than its lower inlet cross-section (II) and here the housing space (25) between the connection and the valve widens conically. 10. Line system with a \ ^r entil according to one of claims 1 to 9, characterized in that the medium when the pump (2) is working from this from a front of the inlet (I) of the upper inlet line (3) into the valve (1 ) The branched secondary line (5) is sucked in and fed from the pump (2) to the valve through the inlet (II). Considered publications:
German Patent Nos. 705 696, 855 183;
British Patent No. 583 198;
U.S. Patent No. 2,371,293. 1 sheet of drawings © 809-661 / 159 10.5 &