DE1938832A1 - Multi-seat, preferably double-seat valve - Google Patents

Description

LINDE AKTIENGESELLSCHAFT

| l (H 513) ' H 69/50

5 July 1969 " Ulb / Κρ

Hehr seat, preferably double seat valve

The invention relates to a multi-seat, preferably double-seat valve, especially for low temperatures, with a hub-like middle part, at least * one of the valve seat surfaces receiving annular Te ^ Ie and between these arranged connecting parts having valve body. Such valves have become known in many designs, whereby the valve bodies are made, among other things, by casting, forging or deformation processes can be made from the solid up It is also known that it is difficult with these valves, In some cases it is impossible to use all seating surfaces evenly

00988 7/1027

-2- LINDE AKTIENGESELLSCHAFT

Wear, especially if the operating temperature fluctuates a lot or to the normal manufacturing temperature «room temperature has a big difference. In order to remedy this disadvantage, it has already been proposed that the valve body and the valve housing part accommodating the valve seats to cast from the same material and even from the same batch »in order to give both parts the same thermal expansion, or as a further measure for at least one of the seats to be provided with a spring-mounted receptacle in the valve housing cage so that the different ones that occur due to the temperature changes Thermal expansion can be compensated for in the axial direction. These proposals disadvantageously lead to valves which are expensive to manufacture and prone to failure in operation.

The invention aims at a multi-seat valve, preferably a double seat valve to create in which, even with high temperature differences, 'all valve sealing surfaces wear evenly, i.e. dioh and in which the disadvantages described above can be overcome. It is also great for those that are too narrow and therefore in practice non-observable requirements for the material, such as production of valve body and cage from one and the same batch and with a certain, constant within narrow limits magnetic permeability, can be dispensed with.

0 9887 / 1Q27

-3- LINOEAKTIENGESELLSCHAFT

As a solution according to the invention it is proposed that at least one of the connecting parts with an elastic deformability that occurs with normal operational stress of the clearances in the direction of the axis of the valve timing surfaces is at least equal to, preferably greater than the sum of the changes in distance between the valve seat surfaces of Valve body and valve housing during the maximum operational temperature and load changes. By the elastic deformability of the one-piece valve body should therefore be the changes in the distance between the valve seat surfaces, be borrowed in such a way that on all valve seat surfaces and at the same time a full concern and thus a perfect tightness takes place or can take place. One special two-way embodiment of the valve seat body is thereby characterized in that the connecting parts with the axially spaced and parallel annular parts Shell-shaped, disk-shaped or frustoconical and the the same center distance associated wall thicknesses of two connecting parts in a ratio of 2 t 3 to 1 t 4 are taltet. This Shaping is based on the idea of one connecting parts associated with one another with regard to the valve seats Valve body to give one of them a large wall thickness and thus a high degree of rigidity and the other in one of the Strength sufficient wall thickness to a sufficient extent elastic

009887/1027

-4- LINDEAKTIEMGESELLSCHAFT

to make deformable. You valve seat body according to the invention have the advantage that the desired measures without additional parts, so without special effort and with the highest Operational safety and can be achieved with permanent effectiveness. A particularly advantageous double seat valve for very low temperatures is characterized by the manufacture of the Valve body · and / or the valve housing ε made of austenitic material Cast steel or austenitic steel in terms of permeability commercial quality and a cold treatment to stabilize the mass before finishing the valve seat diaphragm. Double seat valves can also hit these inventive measures in relatively large dimensions, such as with a valve seat diameter of 600 mm, made practically gas-tight and can be maintained in operation.

The figure shows an example of an embodiment according to the invention Double seat valve shown, which essentially consists of the following main parts: a valve housing 1, a valve body 2, a valve spindle 3 »a valve spindle guide 4 and a housing cover 5; also serve a split ring 6, a ring 7 and a Sohraubbüchse G to connect the Valve spindle 3 with valve body 2. Valve seats 9 and 10 are arranged in valve housing 1. The valve body 2 is Made from one piece and has a hub-like * middle part 11, two each one of the valves!

009887/1027

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receiving annular parts 14 and I5 and between the hub-like Middle part 11 and the annular files I4 and arranged connecting parts 16 and * 17 in the form of Truncated cone hollow bodies. The same distance between the axes is available associated wall thicknesses of the connecting parts 16 and 17 in the cross-sections 1 θ * I9 and in the cross-sections 20 1 21 in Ratio 1 1 3. As a result of this ratio »of the wall thicknesses of the connecting parts 16 and 17, the connecting part 16 is given elastic deformability, while the connecting part in contrast, is practically stiff. This makes it possible to achieve an axially directed occurrence different large opposing forces between the valve spindle 3 and the valve seat surfaces 12 or 15 or the around the flat «de« hub-like middle parts reduced annular surfaces of the connecting parts 16 and 17 and the annular parts 14 and 13 formed circular ring surfaces in the axial direction seen the annular part I4 relative to the hub-like middle part 11 can change its position, while the annular Part 15 rigidly retains its position. Door in the event that at When the valve is closed, there is a high pressure in the spaces 22 and 23 and a low pressure in the tree 24, the annular part becomes «Id the connecting part 16 in the direction of" soles "on the Valve seat surface 12 pressed so that the duroh ersielte the overpressure A strong contact pressure on the valve seat ridge 12 and thus creates a close concern. In the case,

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that, on the other hand, the high pressure in space 24 and the low pressure prevail in the Haume 22 and 23, must be generated by bias elastic force in the connecting part 16 be so high that the Fliohenkraft, which now acts in the "open" direction, the Do not lift the annular part H off the valve seat surface 12 can. Without pressure difference between rooms 23 and 24 is the difference between the valve seat surfaces 12 and 13 The size of the applied pressure forces is equal to that resulting from the elastic deformation of the connecting part a 1 $ resilient force, which in turn is determined by the difference in distance between the valve seat surfaces 12 and 13 on the valve body 2 and in the valve housing 1 at the respective temperature.

BAD ORiQiNAL

3 claims

OQ9887 / IQ27

Claims (3)

LINDE AKTIENGESELLSCHAFT 515) H 69/50 July 25, 1969 Ulb / Κρ Claims Multi-seat, preferably double-seat valve, in particular for low temperatures, with a hub-like middle part, at least one of the valve seat surfaces receiving annular Parts and valve bodies having connecting parts arranged between them, characterized in that that at least one of the connecting parts (16) occurs with a normal operational load elastic deformability of the distance in the direction of the Axis of the valve seat surfaces (12, I3) is equipped, which is at least equal to, preferably greater than the sum of the changes in distance between the valve seat surfaces (12, I3) of Valve body (2) and valve housing (1) is during the maximum operational temperature and load changes. 009887/1027 -ö- LINDEAKTIENGESELLSCHAFT 2. Double seat valve according to claim 1, characterized in that the connecting parts (16, 1j) with the axially spaced and annular parts (14 »15) running parallel to one another are shell-shaped, disk-shaped or frustoconical and the wall thicknesses of two connecting parts (16, I7) assigned to the same center distance in a ratio of 2 »3 to 1 t 4 are designed. 3. Multi-seat ·, preferably double-seat valve according to claim 1 or, 2, characterized by the manufacture of the valve body (2) and / or the valve housing (1) from auetenitisohem Cast steel or austenitic steel in terms of magnetic permeability of commercial quality and a cold treatment for dimensional stabilization before the final machining of the valve seat sealing surfaces. BAD OR'GiMAL