DE2129905A1 - Control device for controlling the displacement of an organ, for example the shut-off body of a gate valve - Google Patents

Description

Patent attorney patent attorneys

Dr. phil. Gerhard Henkel Dr. rer. nat. Wolf-Dieter Henkel

D-757 Baden-Baden Balg Dipl.-Ing. Ralf M. Kern

iJfiSün & v Dr. rer. nat. Lothar Feiler

T «l» gr.-Atf.:Bllp »oldBadMi-Ba <l« n D -8 mouths 90

Eduard-Sdimld-Str. 2 ρ - | Tel .: (0811) 663197

T «l * gr.-Adr.i Ellipsoid MOndian

Societe pour le ^{Development ΤβΙβχ:}

de la Recherche Appliquee
9 bis, rue Jean Mallard 83

Toulon / PRANCIA

Control device for controlling the displacement of an organ, for example the shut-off body of a gate valve

Gate valves are known which consist of a shut-off element and assemble a control device, which by one of hand, electric, hydraulic or pneumatic operated motor is operable.

Pur certain uses that require rapid drainage or Require diversion of a pressurized fluid, for example when using remote controlled safety valves or pressure wave generators, the known control devices are relatively large due to their long response time not usable because the very rapid displacement of the shut-off valve body results in a great acceleration and requires very considerable power, which is possible with the known motors based on mechanical, electrical, hydraulic or pneumatically driven is not achievable.

The services to be provided at the moment are in the order of magnitude of hundreds or thousands of KiIo-

watt for gate valves with a cross-sectional area of 10 and more mm and pressures on the order of 100 bar.

109852/1380

Palls the gate valve exhibiting elevated temperature To control fluids, their structure is even more difficult.

To avoid this weak part, the previously usual The technique of converting energy using motors was dropped and a novel device was created without going back to the individual improvements, while the performance and speed of starting up known motors, in particular pneumatic power cylinder, which, however, depends on the limited capacity of the energy source and the energy transport lines are dependent.

Pyrotechnic gate valves are already known with which a quick opening process can be carried out, but these do not allow several successive modes of operation, so that they can only be used to a limited extent.

In contrast, the object of the invention is to provide a control device for controlling the displacement of an organ such as a valve body, Consists of at least one piston which is connected to the organ to be moved and which is displaceable is arranged in a cylinder and with the latter delimits a supply chamber, which temporarily with a source of a pressurized fluid can be brought into communication and is otherwise separated from this source, and a restoring element for the piston, the effect of which is opposite to the original effect of the pressurized fluid on the piston is to create, while the original volume of the supply chamber is still very small, which the disadvantages mentioned avoids and enables a quick opening process by releasing the potential energy of a pressurized gas, which may be followed by a renewed closing of the gate valve.

109852/1380

This object is achieved according to the invention in that the supply chamber above a predetermined volume, which is considerably below its maximum volume, can be brought into connection with a relaxation space for the pressurized fluid Connection is on which the piston is mounted displaceably and sealed, that the piston can be placed against the two end faces of a stop firmly connected to the cylindrical piston rod and that an elastic return element, which is arranged between the stop and the piston, prevents the original effect of the pressurized fluid contained in the supply chamber counteracts the piston, in such a way that the original displacement of the piston corresponds to a relative displacement of this piston with respect to the ζ ., displacing member, these two elements only moving together if the piston rests against one surface of the stop.

Advantageously, the expansion space is formed by a chamber that is opposite to the supply chamber Side of the piston is in the cylinder.

The connection of the supply chamber with the expansion space is either provided via a connection in the wall of the cylinder Cross-sectional opening or can be produced via a line, in which a valve-controlled gate valve is switched on.

The relaxation space is preferably connected to the atmosphere.

The device can be designed in such a way that the piston is initially with the interposition of a seal that this seal rests against the wall of the cylinder

- 4 10 9 8 5 2/1380

delimits a mean cross section of the piston, which is smaller than the cross section of the guide with which the piston surrounds the cylindrical piston rod, and that there is a play between this central cross section and an extension of the cylindrical piston rod and the gap formed by this clearance is always with the source of the pressurized fluid is in communication, such that the action of the pressure of the fluid on the first piston before connecting the Feed chamber with this source presses the first piston against the seal.

* According to a further embodiment it can be provided next to the piston, which is arranged displaceably in a second cylinder, which is in connection with the source of the pressurized fluid and is firmly connected to the body of the first cylinder, that the .under pressure standing fluid initially acts in opposite directions on the two pistons, and that the cross section of the second piston is smaller than that of the end face of the first piston delimiting the supply chamber.

The device according to the invention can be used in particular with a gate valve. In this case, points the gate valve on a gate valve housing movable with respect to the gate valve body, which is connected to the first Piston is in connection, while the gate valve housing is formed firmly connected to the first cylinder is.

Advantageously, the shut-off body is firmly connected to the cylindrical piston rod and is the first piston mounted on the cylindrical piston rod with a radial play, which is filled by a seal is. The two cylinders can be attached to the outside of the shut-off

109852/1380

valve housing or gate valve body may be provided.

The following is an exemplary embodiment of FIG Invention explained in more detail with reference to the drawings. Show it:

1 shows an axial section through a gate valve with the features of the invention and

2 shows an axial section through part of a modified one Control device for the gate valve according to FIG. 1.

In Fig. 1, the gate valve according to the invention is with his control device shown, this control device also other displaceable organs how the movable flap valve of a gate valve can be assigned.

Fig. 1 shows the warm part of the gate valve, the through a through channel 1, one connected to a cylindrical and axially displaceable piston rod 3 Shut-off body 2 and a discharge nozzle 4 is formed. This warm part or gate valve body is on one Fixed container 5 containing a pressurized heated gas to be discharged.

The control device is from the warm part through a Wall 7 separated, on which a penetrated by the piston rod 3 Bearing 6 is attached.

The control device comprises a body 8, inside of which two cylinders 9 and 10 are provided. In the cylinder 9 is a piston 11 consisting of two parts for the purpose of holding it on both sides of a stop 12 with a limited Displaceability mounted on the piston rod 3. The stop 12 is located inside one in the piston

1098 52/1380

provided cavity I3 on the piston rod 3. The piston 11 is sealed into the cylinder by means of a sealing element 14 and can be located between the shoulders 12a and 12b of the stop 12 move, by means of a spring I5 from the fastening point of the shut-off body 2 is preloaded away on the piston rod 3. The piston 11 is at its one end 11a via a sealing element

16 connected to the piston rod 3, while its other end 11b surrounds this piston rod with radial play. This arrangement enables a convenient radial adjustment without the piston 11 being on the inner wall of the cylinder 9 canted.

The piston 11 delimits a supply chamber in fire in the cylinder 9 17 and a relaxation space 18, which is closer to the shut-off body 2 than the supply chamber 17 · When the shut-off body 2 is in the closed position, the initial volume of the supply chamber I7 is very large small, this chamber being practically formed by a thin layer of fluid contained in that between the piston 11 and the body 8 existing space is included. The piston 11 is sealed by a seal 19 on the body 8. This position is shown in FIG. In addition, the chamber I7 is above a discharge nozzle 20 in connection with the atmosphere. The diameter of the seal 19 is smaller than that of the sealing element 16.

A second piston 21 is firmly connected to the end of the piston rod 3 opposite the valve body 2, which is able to slide along the cylinder 10 and in the body 8 delimits a chamber 22 which contains a container forms for a pressurized fluid and for this purpose via a connecting line 23 with the source of a pressurized fluid is connected. The chambers

17 and 22 are separated from each other by a partition,

109852/1380 " ⁷ "

which is penetrated by the piston rod 5 while ensuring a play 25 and without sealing. A spring 2k inserted between the body 8 and the piston 21 urges the valve body 2 into the closing division, particularly when there is no fluid in the chamber 22. The cross section of the piston 21 is smaller than that of the piston 11.

109852/1380

When the shut-off body 2 is in the open position, the piston 11 is no longer in

. · Engagement with the seal 19 and are the chambers 17 and 22 through the space formed by the game 25 free Space in connection with each other. This position is shown in FIG. However, if on the contrary the piston 11 is in contact with the seal 19, As shown in Fig. 1, the chambers 17 and 22 are connected to one another via a line 26, in which an electrically controlled slide is arranged.

In the embodiment shown in FIG. 1, the cylinder 9 has an enlarged cross-section 9 & in its section closest to the shut-off body 2, whereby an opening is formed such that the. Piston 11 establishes a connection between the chamber 17 and the expansion space 18 when it reaches the zone of enlarged cross-section 9 & . Of course, other arrangements can also be selected in order to produce the mentioned opening without a uniform enlargement of the cross section of the cylinder 9 along its entire circumference being necessary.

In the embodiment shown in Fig. 2, a line 28 is provided which the chamber 17 and the expansion space 18 connects to one another when the piston 11 slides past the end 28a of the line 28 and over postpones the same thing. This arrangement represents »ine Another possibility for establishing a connection between the spaces 17 and 18. In this embodiment is an electrically controlled slide 29 is provided in the line 28.

- 9 109852/1380

The illustrated and described embodiments can be modified in various ways without thereby departing from the basic principle of the invention will. For example, the shut-off body and the body of the gate valve do not need to be in the form of one Valve to be designed with a conical seat, rather, any known with the control device Kind of gate valve and even an organ that is not such a gate valve. Further the piston 21 can be arranged in different ways. Also i

can the different chambers, the connection of the valve body 2 with the control device and the relative positions of the stop 12 and the piston 11 may be provided differently than in the case of the described exemplary embodiment is the case.

The operation of the gate valve, which is described below, is very simple. The gate valve is essentially characterized by a high level of performance, in particular with regard to the opening speed of the valve body 2, but also by a great resistance in adverse working conditions and on contact with heated gases contained in container 5.

The chamber 22 is filled with a pressurized fluid in any known manner, and the displacement of the valve body 2 in its open position proceeds as explained below with reference to FIG. 1 themselves. The electrically operated slide 27 is in his Open position controlled and connects the chamber with the originally very small space of the supply chamber 17 The small volume of the chamber 17 enables the piston 11 to be set in motion quickly, the same from

- 10 -

109852/1380

- ίο -

the seal 19 is detached and in this way the chambers 17 and 22 with one another via a channel 25 of large cross-section connects. Then the speed of displacement of the piston 11 increases, which is then connected to the Shoulder 12b of the stop 12 abuts. The pressure force acting on the piston 11 is greater than the sum of the forces acting on the valve body 2 and the piston 21, and allows the energy released during the impact a free displacement of the piston rod 3 and a rapid movement of the valve body 2 into its open position.

- 11 -

109852/1 380

When the piston 11 is in the zone with the enlarged cross section 9a or in the area of the above-described If the opening, which is usually provided, is reached, the pressures in the chamber 17 and in the space 18 try each other compensate and cancel the resulting forces acting on the piston 11 mutually · The on the axial pressure acting on the piston rod j5 then changes its sign so that the opening movement slows down, cancels or is replaced by a displacement of the valve body 2 into its closed position.

When the closing process is finished, the fluid contained in the chamber 17 is discharged through the nozzle 20 to the outside. A small opening that is drilled through the piston and otherwise has no effect on the movement has relevant operating mode, then connects the cavity 18 and the chamber 17 with one another and enables at the same time emptying the tree 18.

Incidentally, in numerous applications it is not necessary Provide sealing elements 14 on the outer circumference of the piston 11, if the game between this piston and the cylinder 9 is very small.

After the closing process, the gate valve is ready for another opening cycle.

With the help of the control device described, opening times can be achieved that range from 10 milliseconds to several hours can be varied by changing the cross section of the connecting lines or openings and the nozzle 20 is changed accordingly.

In addition, the operating mode of the gate valve can be calibrated by feeding a small amount of one under pressure

109852/13 & 0

control standing fluids in the chamber 17, the supply for example through a pressure relief valve, the electrically operated slide 27 * with a slide Mechanical control or the like. Controllable. Connecting the chamber 17 to a variable pressure standing source enables the valve body 2 to be opened when a predetermined pressure threshold is reached. The container 5 and the chamber 17 can also have a Check valve interconnected, turning the gate valve into a relief valve with remarkable Performance in terms of response time and opening cross-section is converted.

The closing process programmed by the position of the enlarged cross section 9a can easily be carried out by using des.electrically controllable slide 29 according to FIG. 2 can be replaced by a remote-controlled closing process.

Obviously, the gate valve uses the energy of the pressurized one for its functionality Fluids contained in the chamber 22 and relaxes by moving the valve body 2 in the open position fills the chambers 17 and 22 and the space 18. This depends on the functionality of the gate valve does not depend on an outside source and it can be an instantaneous considerable achievement are produced. Only the return to the starting position requires a restoration of the pressure in the chamber 22, which, if desired, can also be done slowly and gradually. This also applies to that Discharge of the residual fluid through the nozzle 20 after the valve body 2 has been moved into its open position.

109852/1380

The difference in the diameters of the seal 19 and the sealing element 16 is selected in such a way that that initially, before the chamber 17 communicates with the chamber 22, the one acting on the piston 11 Pressure of the penetrated into the space 13 of the piston 11 Fluids this piston 11 strongly against the seal I9 and in this way ensures a good original seal.

Gate valves of the type described above are particularly suitable for the construction of remote-controlled safety valves and pressure wave generators can be used.

As already pointed out, the control device of this gate valve can generally be used for any mechanical control Find use when a rapid displacement requiring high power instantaneously applied is desired and this shift should, if necessary, be followed by a rapid return to the starting position.

It should be noted that the separation the control device, which is arranged on the outside of the gate valve body forming the warm part, of this body leads to a remarkable resistance of this device, so that this under the can be operated in a wide variety of environmental conditions.

Of course, the invention is not restricted to the precise embodiments as described above are, but is also intended to include modifications that are obvious to the person skilled in the art.

- 14 -

109852/1380

Claims (10)

Godfather tans ρ rüche /1.! Control device for controlling the displacement of an organ such as a valve body, consisting of at least one piston which is in communication with the organ to be displaced and which is arranged displaceably in a cylinder and with the latter delimits a supply chamber which is temporarily connected to a source of a sub Pressurized- W the fluids can be brought into connection and is otherwise separated from this source, and a restoring element for the piston, the action of which is opposite to the original action of the pressurized fluid on the piston, while the original volume of the supply chamber is still very small is, characterized in that the supply chamber (17) above a predetermined volume, which is considerably below its maximum volume, can be brought into connection with a relaxation space (18) for the pressurized fluid that the member (2) to be displaced with communicates with the piston (11) via a cylindrical piston rod (j5) , on which the piston is slidably sealed, that the piston (11) can be placed against the two end faces (12a, 12b) of a stop (12) firmly connected to the cylindrical piston rod (3) and that an elastic return element (15) * which is arranged between the stop and the piston, counteracts the original effect of the pressurized fluid contained in the supply chamber on the piston, in such a way that the original displacement of the piston (11) is a relative displacement of this piston with respect to the member to be displaced ( 2), these two elements only move together when the piston rests against one surface (12b) of the stop. - 15 1098 5 2/1380 2. Apparatus according to claim 1, characterized in that the relaxation space (18) is formed by a chamber, which is located on the side of the piston (11) opposite the feed channel (17) in the cylinder ″ (9). J3. Device according to claim 1 or 2, characterized in that that the connection of the supply chamber (17) with the expansion chamber (18) is provided via one in the wall of the cylinder (9) Cross-sectional opening (94) can be produced. 4. Apparatus according to claim 1, characterized in that the connection of the chamber (17) with the relaxation space (18) can be produced via a line (28) in which a gate valve (29 ')' is switched on with a controlled shut-off effect. 5. Apparatus according to claim 1 or 2, characterized in that the relaxation space (18) is in communication with the atmosphere stands. 6. Device according to one of the preceding claims, characterized in that the piston (11) initially with the interposition a seal (19) on the wall of the cylinder (9) is applied so that this seal delimits a central cross section of the piston (11) which is smaller than the cross section the guide with which the piston encloses the cylindrical piston rod (3), and that between this middle Cross-section and an extension of the cylindrical piston rod, there is a game and that is due to this game formed gap is constantly in communication with the source of the pressurized fluid in such a way that the effect of the pressure of the fluid on the first piston prior to connecting the supply chamber (17) to this source against the first piston the seal presses on. 7. Device according to one of the preceding claims, characterized in that in addition to the piston (11) a second piston (£ 1) is provided, which is connected in a second cylinder (10) 109852/1380 - 16 - is slidably arranged which is in communication with the source of the pressurized fluid and is firmly connected to the body of the first cylinder (9) that the pressurized Fluid initially acts in opposite directions on the two pistons, and that the cross-section of the second Piston is smaller than that of the end face of the first piston delimiting the supply chamber (17). 8. Control device according to one of the preceding claims in application to a gate valve, characterized in that that the gate valve has a movable shut-off body (2) in relation to the gate valve housing having, which is in communication with the first piston (11), while the gate valve housing with the first Cylinder (9) is firmly connected. 9. Control device according to claim 8, characterized in that the shut-off body (2) with the cylindrical piston rod (5) is firmly connected and that the first piston (11) on the cylindrical piston rod (j5) with a Radial play is mounted, which is filled by a seal (16). 10. Control device according to claim 7 and 8, characterized in that that the first and second cylinders (9 and 10) are provided on the outside of the gate valve housing or shut-off body are. 1 09852/1 380 ι ^Λ · ♦ Blank page