DE2548967A1 - DEVICE FOR BLOCKING A DUCT IN WHICH GAS AND SOLID PARTICLES CIRCULATE CONTINUOUSLY OR INTERMITTED - Google Patents

Description

The invention relates to a device for shutting off a sewerage system, in which a gas and solid particles circulate continuously or intermittently «

There are very numerous types of valves with which a tight shut-off in a sewer system can be achieved, the clean, unloaded fluids transported. There are equally numerous types of closure devices that include a The latter allow acceptable tightness of a particle flow However, devices are normally not suitable for ensuring a seal for gases at the same time.

609821 / 066S

- Page 2 -

Now, it is object of the present invention to provide a new shut-off valve, the Long operation is capable of _y simultaneously to effect a seal for the solid particulate material and for the gas, which transports the Peststoff or accompanied.

The invention relates to such a valve or a shut-off valve _f which makes it possible to seal off a sewer system with a generally rotational cross-section, in particular with a circular cross-section. It should be noted that the orientation in the area of the sewer system must be such that the circulation of a granular pesticide is possible when the shut-off valve is open. When the shut-off valve is closed, it creates the tightness for pesticides, but also for gases. The main advantage of this valve is that the presence of particles of granular pesticides does not lead to a deterioration in the tightness of the apparatus; this property is retained even if the pesticide is very abrasive, such as aluminum oxide granules.

The tightness is retained equally with other pesticides, in particular for oxides of the elements of groups II, III and IV of the periodic table of the elements. Mentioned are e.g. besides the already mentioned aluminum oxide, silicon dioxide, mixtures of silicon dioxide and aluminum dioxide, magnesium oxide, Mixtures of silicon dioxide and magnesium dioxide, mixtures of aluminum oxide and magnesium oxide, mixtures of silicon dioxide and thoronic oxide, etc. .

609821/0665

- sheet 3 -

These oxides are all carriers of catalysts used in very different conversion reactions of hydrocarbons " such as reforming, dehydration, aromatization, dehydrocyclization, isomerization, hydrocracking, cracking etc.w * Thus the importance of valves according to the invention which can be used in devices "in which the reactions just listed take place «Certain of these reactions take place at very high temperatures above 500 C and at Pressures often over 20 bar are completed, but the valve or shut-off valve according to the invention can be used under such test conditions function if the materials of the valve are suitable «· were chosen.

The invention is particularly applicable in those cases where, before the line was shut off, on the one hand the plague bodies could be shut off by a suitable means, for example by blocking the inflow of the plague bodies upstream through a valve that is sealed against plague bodies and on the other hand by the most of the evacuated Pestkörper in the immediate vicinity of the valve according to the present invention, by flowing, for example, the Pestkörperstoff due to the gravity downstream _f to clear so the room where it will make the blocking of the Pluids. This means that one has the advantage of arranging a first, non-gas-tight shut-off valve for the solid, and then a shut-off valve according to the present invention, in the direction of flow of the fluid and the solid. It was found, however, that this arrangement was not absolutely necessary and

r ο 9 fi ο 1 / Π Γ, f; 5

- sheet 4 -

that it was possible, only the shut-off valve according to the invention to use to ensure the two sealing functions at the same time.

The sealing members of the valve are on the one hand a movable _f metallic part, commonly called valve disc and a rotationally symmetrical (and circular in particular) called and on the other hand a metallic, Real part of approximately annular in shape and usually the valve seat "These two parts have such dimensions that a continuous line of contact between them exists »This line of contact is roughly circular (in the case of a circularly symmetrical valve disc) and the tightness is obtained by bringing these two parts closer together and exerting a certain force of contact between them. Proceeding in this way is classic and well-known. The two parts causing the tightness are made of a material that they are not grooved or destroyed by the solid body, which means that their hardness must be higher than that of the solid body. Tungsten carbide, for example, can be used for aluminum oxide granules. The respective arrangement of the two parts must be such that in the open position the flow of the solid can proceed freely; one possibility is e.g. B. to incline the horizontal valve seat and valve disc, as is the case in the figure, where the valve disc with the reference number 4 and v / o the valve seat with the reference number 3 are designated.

60982T / QG 6S

- sheet 5 -

Total tightness will be achieved if it is possible to to avoid an accumulation of solids along the contact line between the valve disk 4 and the valve seat 3. To the gathering Avoiding fragments of solid bodies on the aforementioned contact line is a new, peculiar kinematics concerning the handling with the device according to the present invention accomplished during the approach of the valve disk towards the seat, see the valve disc rotates around its axis of symmetry. This rotating movement is continued after the two pieces 3 and 4 have come into contact. According to the invention, the Assembly of the valve disk, however, realized in such a way that the rotation of the same with the application of a limited and controlled Force can be stopped, but the valve disc is forced to rotate at least one revolution around the axis of symmetry- ^ g ^ complete contact with the valve seat. This movement represents the crushing and wiping away of solid fragments sure that would have a tendency to cluster at this point.

One of the possible designs to achieve this result can be realized with the device of the figure: the valve disc 4 advances when the valve spindle is actuated. At the beginning of the movement the valve disk 4 is through the game of positive coupling pieces 6 and 7 taken along. As soon as the valve disc comes into contact with the valve seat 3, the valve spindle continues to push the valve disc through the Take along the play of the coupling pieces. The installation of the spring 5

809821/0665

- leaf 6 -

but does it allow the valve disc to continue rotating without the contact force going beyond a limit value ? which is determined experimentally and which depends on the relative hardness of the plague body and the materials of construction of the sealing parts. At the end of the closing period, the two coupling pieces, the rotational movement stops and the closure ends in a simple translational movement under a _force} is sufficient to provide the tightness safely disconnect ^

The main parts of the new valve according to the invention and their respective arrangements are now more detailed below described with reference to the figure.

As is known, the valve usually includes?

A valve housing 9 and its cover 12, a valve seat 3 or a completely equivalent means a device 4 "which takes on the function of a valve disk" the one with a hub 13 * that serves as a control rod and is connected to an operating wheel, which may not be with one The torque limiter shown is provided with a stuffing box 10 provided with its holder 11, an actuating cross member 14, possibly a guide sleeve 8 of the back sealing cone.

609821/0665

- sheet 7 -

The valve housing 9 is preferably arranged in the sewer to be closed in such a way that the closing of the solid matter is optimally ensured. Likewise, the position of the valve disk 4 within the valve housing 9 is aimed at the same goal. For this reason, the preferred embodiment is the * shown in the figure, the valve plate 4 and the valve seat 3 are rotary parts, which have about the same axis As previously _mentioned, depend on the selection of the material from which these two parts are made of several criteria:. the hardness must be greater than than that of the hardest solid body to be transported in the pipe to be closed and the resistance to working temperatures and pressures must be sufficient; moreover, the resistance to grinding to the substances to be transported in the pipe must be sufficient to enable long operation.

According to the invention, the valve head forms 4 or the equivalent Device no unit with the valve spindle 13, as is the case in classic designs. According to the invention the valve disk 4 for rotation with the valve spindle connected to this by means of the devices 6 and 7, devices which serve as positive coupling pieces; this device or positive coupling pieces 6 and 7 (provided with teeth or corresponding systems) interlock by a device such as the valve spring 5, which is located between the valve disk 4 and the lower coupling piece 7 is arranged. This special execution

609821 / 0P65

- Sheet 8 -.

tion allows, as you will see, to achieve perfect tightness at the moment of the closing process »

The detailed operation of the valve of the present invention is as follows: The open valve as shown in the figure now considered. The catalyst flows freely on the valve plate 4 within the valve housing 9 as shown by the arrows 1 and 2 indicated direction over. A valve for the pest body (not shown in the figure) that is placed upstream is closed and the solid flows normally around the To release space between the valve seat 3 and the valve disk 4 ^ then the valve wheel is turned in order to gradually bring the valve disk closer to the valve seat.

The valve spindle unit behaves in the course of this process 13 — Valve disk 4 like a rigid unit. In particular the valve spring 5 follows the spiral movement of the assembly without being compressed nor expanding.

When the valve disk 4 comes into contact with dust particles that have accumulated on the valve seat 3, a frictional torque begins to be developed at the height of the valve plate 4. The valve disk 4 is, however, rotated further lowered until it is with a force sits on the valve seat 3, which is getting bigger. The gradual increase in the frictional force causes a gradual one Separate the two coupling pieces 6 and 7 by removing the valve spring 5 is compressed.

809821/0665

- sheet 9 -

In the course of the rotation of the valve head, which is carried along the solid particles accumulated on the valve seat are removed,

If the frictional torque becomes too great, the two separate Coupling pieces 6 and 7 finally, which brings the rotation of the valve disk 4 to a stop. As the valve wheel continues, however rotates, the valve spring 5 is compressed. The pressure force thus generated causes the valve disk 4 to sit on its valve seat 3 is pressed. Am not shown in the figure torque limiter, which is arranged at the level of the valve wheel interrupts the process and the valve disk 4 remains at a predetermined value Force pressed on a valve seat 3 «In summary, the closing process takes place in three stages:

1. Approach of the valve head to its valve seat in a Rotary motion until touch;

2. Rotation of the valve plate on its valve seat until the coupling pieces diverge, so that the valve seat of all solid particles located there are cleaned;

3. Axial pressing down of the valve disk onto its valve seat to trigger the torque limiter.

The opening of the valve takes place according to the exact opposite process:

1. Relaxation of the valve spring 5

609821/0665

- Sheet 1O -

2. Interlocking of the couplings and reverse rotation of the valve disc

3. Lifting the valve disk from its seat »

The present invention thus relates to a shut-off device consisting of a valve housing, a fixed valve sealing seat which is a usually circular rotating part and a valve disk which is movably arranged in the sealing chamber and which in the sealing position sits tightly on the sealing seat sits on the valve seat by rotating an actuating rod that can be actuated by a drive hub about its axis approximated or removed with the axis of the valve disc coincides, which is usually a conical or frustoconical Rotary part, the axis of which approximately coincides with that of the valve seat, and with control devices for movement of the valve disk approximately perpendicular to the sealing seat by connecting links located between the valve disk and the actuating rod (the valve seat with the actuating rod is not firmly connected) between the inner part of the valve seat and the actuating rod approximately are arranged along the common axis of the valve head and the actuating rod and which comprise an elongated, resilient part, one end of which is fixed in the inner part of the valve head, the outer part of the valve head being the one is, which is in contact with the valve seat when the shut-off device is closed and the other end with a toothed one

609821/0665

- sheet 11 -

Coupling piece is connected, which in the open position with a second toothed coupling piece connected to the actuating rod is in contact, but when the shut-off device is closed with this second toothed coupling piece is out of connection, the arrangement of the connecting members between the valve disk and the actuating rod furthermore is characterized in that when the shut-off device is open, the same by actuation of the actuating rod can be closed by means of the drive hub, the rod being excited to a rotational movement about its axis, which causes the approach causes the valve disk on the valve seat and the valve disk due to the mutual engagement of the two Coupling pieces likewise performs a rotation around its axis, gradually approaching its seat, which takes so long continues until the force exerted on the resilient part by the drive hub and by the connection of the actuating rod and the coupling pieces is so great that the resilient part from the beginning of the solution of the mutual engagement of the coupling pieces is compressed to a limited extent, this solution of the mutual engagement of the coupling pieces by terminating the rotation of the valve disk makes known, but due to the force still exerted on the resilient part by means of the drive hub of the actuating rod, it is approaching continues by translation on its valve seat, so as to ensure the tightness.

The device according to the present invention allows

609821 / Q665

- sheet 12 -

Furthermore, the implementation of a method for interrupting a circulating flow through an elongated space which contains at least one gas and at least one solid matter, the solid matter consisting of powder or particles _f which are granules or spheres or have any other shape and the solid matter through the Gas is pushed or carried behind using a shut-off member within the elongated space which has a rotational shape and is in contact with a peripheral edge, the shape of which is also a rotational shape and the axis of which coincides with the axis of the shut-off member, the method being characterized in that Before the completely tight contact between the shut-off element and the peripheral edge, the shut-off element is subjected to a rotation before and during the contact with the peripheral edge in order to prevent or reduce the presence or accumulation of particles in the contact zone of the shut-off element with the peripheral edge Eiden, in order to then ensure total tightness by pressing the shut-off element onto the peripheral edge.

Example:

The device according to the figure has been used with success to to shut off a pipe in which a gas and spheres of aluminum oxide with a diameter of 2 mm circulated, while numerous Valve types of different designs were unsatisfactory because in the best cases the tightness was

609821/0665

- sheet 13 -

not at the end of a few tens of opening and closing operations more satisfactory, after ten opening and closing processes the leakage was already more than 5 m / h (at 20 bar).

The valve of the present invention has after more than
thousand opening and closing operations, a very high level of gas tightness is preserved, since the leakage observed was less than 10 liters of gas per hour under normal conditions with a differential pressure of evenly 20 bar between the valve inlet and outlet. In the pail examined, the material of the valve seat and the valve disc was tungsten carbide,

609821/0665

Claims (5)

- Sheet 14 claims \
1 .. Device for locking consisting of a valve housing, a fixed valve sealing seat »which is a rotating part and a valve plate which is movably arranged in the closing chamber and which sits tightly on the sealing seat in the closed position and which is rotated by an actuating rod that can be actuated by a drive hub whose axis is approached or removed from the valve seat, the axis of the actuating rod coinciding with the axis of the valve disk, which is a rotary part whose axis approximately coincides with that of the valve seat, characterized by connecting members located between the valve disk and the actuating rod, which comprise an elongated, resilient part, one end of which is fixed in the inner part of the valve head, the outer part of the valve head being that which is in contact with the valve seat when the shut-off device is closed and the other end with a toothed cup Plung piece is connected, which in the open position is in contact with a second toothed coupling piece connected to the actuating rod, but which is out of connection with this second toothed coupling piece when the shut-off device is closed, and which can be closed when the shut-off device is open by actuating the actuating rod by means of the drive hub , with the rod about its axis to a rotational 609821/0665 - Sheet 15 claims movement is excited, which causes the approach of the valve plate on the valve seat and the valve plate due to the mutual engagement of the two coupling pieces also performs a rotation around its axis while gradually approaching its seat, which lasts as long as until the on the resilient part through the drive hub and by connecting the operating rod and the coupling pieces exerted force is so great that the resilient part of the beginning of the release of the mutual engagement of the Coupling pieces is compressed to a limited extent, this solution of the mutual engagement of the coupling pieces by stopping the rotation of the valve disk, which, however, continues to act on the resilient part the force exerted by the drive hub of the actuating rod moves it closer by translation onto its valve seat continues there in order to ensure the tightness. 2. Method of interrupting a circulating flow through an elongated space containing at least one gas and at least contains a solid matter, the solid matter consisting of powder or particles, among Use of a shut-off member within the elongated space that has a rotational shape and is in contact with a Peripheral edge, the shape of which is also a rotational shape and the outer axis with the axis of the shut-off duct. 609821/0 66 5 2 5 4 8 9 6 - Sheet 16 claims collapses, characterized in that before the completely tight contact between the shut-off element and the peripheral edge, the shut-off element is subjected to a rotation about its axis before and during contact with the peripheral edge in order to avoid the presence or accumulation of particles in the contact zone of the shut-off element to prevent the peripheral edge or avoid _f thereafter a total tightness by pressing the shut-off on the peripheral edge safe ^ ^ -to make. 3. Device according to claim 1, characterized by guide or control devices for moving the valve disk approximately perpendicular to the valve seat. 4. Apparatus according to claim 1, characterized 'that a Guide transition piece is arranged between the resilient part and the inner part of the valve disk, wherein in Closing position of the guide transition piece in one Located in the cavity, which is arranged in the center of the sealing valve plate. 5. The method according to claim 2, characterized in that the tightness of the elongated space is only initiated when ■ the majority of solid particles from this space eliminate 5098 2 1 / QB65 - Sheet 17 claims __ has been learned " B09821 / 0665 Blank page