DE2609027A1 - High-temp. valve esp. for gas-cooled reactor - has internally cooled rod and head with insulation - Google Patents

Abstract

A high-temp. valve, esp. for reactor plants, comprises a casing, two seatings within the casting and a valve body or head which is operated (e.g. moved linearly) from outside the valve casing by a piston rod. Both this piston rod and also the valve head are hollow, so that a cooling fluid can flow through them. Pref. the valve head has an external facing of refractory e.g. ceramic material, the valve casing and inlet and outlet lines being pref. also lined with ceramic or similar refractory material. Used esp. for high-temp. fluids in nuclear reactors, e.g., for helium at up to 900-950 degrees C. The arrangement enables the moving parts of the valve to be internally cooled, thus maintaining them at a lower temp.

Description

PATENT ADVOCATE

DR.-ING. HANS LEYH

D-8 Munich 80,

Lucile-Grahn-Strasse 38

Our reference: A 13 233

Lh / fi

Herion-Werke KG Stuttgarter Str. 120 D-7012 Fellbach

High temperature valve

The invention relates to a high temperature valve, in particular for reactor systems, with a housing, at least one in this trained valve seat, a valve body interacting with the valve seat, which by means of an externally drivable piston rod can be actuated to open or close the valve seat.

In the case of reactor systems, e.g. those with a helium cycle and possibly Helium intermediate cycle, helium gas flows with temperatures of around 900 to 95O ° C are generated. This helium gas will used to generate steam, at a temperature of e.g. 220 ° C. cools down.

Valves are now required for the high-temperature circuits or for the lines in which the hot gas flows

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Withstand temperatures on the order of 900 to 95O ° C.

The invention is therefore based on the object of a high-temperature valve to create that is cooled in a simple and economical manner, in particular on valve plates and valve seats can be.

According to the invention this is achieved in that the piston rod and the one with it for the passage of a coolant connected valve body (valve disc) are hollow.

The piston rod is preferably in an elongated chamber adjoining the housing in its longitudinal direction slidably arranged, the chamber being divided by a transverse wall into two substantially separate spaces, one of which is a feed opening and the other has a discharge opening for the coolant, the hollow piston rod extending through the two spaces and the part of the piston rod which is located in the space facing away from the valve body in its circumferential wall is provided with passage openings for the coolant.

By means of these openings in the wall of the hollow piston rod is it possible to feed the coolant into the interior of the piston rod and the valve body connected to it or derive from it.

The openings in the wall of the piston rod are expedient arranged so that they are always in the space above the transverse wall when the valve seat is open and closed.

Preferably the piston rod is in the space below the transverse wall at a radial distance with, for example, a concentric one

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Surround the pipe so that an annular space is formed between the piston rod and the pipe, the position of the pipe being chosen so that its upper open end has an axial distance from the transverse wall when the valve is open and when the valve is closed Valve protrudes over the lower end wall of the room below the transverse wall.

The tube and the piston rod are connected to one another at their lower ends by a substantially hollow spherical connecting part connected, while the valve body by means of a hollow base connected to it, the approximately hollow spherical Connecting part encompasses and overlaps, is movably connected to the latter.

The connecting piece is advantageously provided with a central through opening which forms the lower mouth of the piston rod connects with an inlet opening of the hollow valve body, as well as provided with e.g. two lateral through openings, which connect the corresponding outlet openings of the hollow valve body with the annular space between the piston rod and the tube.

The valve body can be provided with partition walls on both sides of its inlet opening for stiffening, which are used for passage of the coolant have openings.

The hollow base of the valve body is expediently with E.g. two outlet openings are provided for the supply of the coolant to one of the valve seats, and also for discharge of the coolant from the valve seats, the end wall between the chamber and the housing is provided with an annular gap.

According to a further embodiment of the invention, it is proposed that to provide the chamber with two spaced apart transverse walls, which are arranged such that at

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closed lower valve seat, the openings in the wall of the hollow piston rod between these two Transverse walls lie, with seals being provided to the space between the two transverse walls against the above and to seal the space below the chamber.

This ensures that when the valve is closed, no coolant enters the hollow piston rod and thus prevents that coolant leaks into the main line.

According to yet another embodiment of the invention the tube closed at the end at its upper end, but provided in its circumferential wall with at least one passage opening which, when the main valve is closed, by means of a seal is closed. This achieves on the one hand with opposite coolant circuit that the coolant in the annular space between the tube and piston rod and thus in the valve body "in and out of this escapes into the main line, while on the other hand it is prevented that about gas from the main line in the coolant circuit flows back.

The housing and the main lines are expediently provided with a double wall, with the space between the two walls is filled with a heat-insulating ceramic mass. over the outer wall of the housing can Furthermore, a jacket can be arranged which is occupied with a plurality of temperature sensors to measure the outside temperature to be able to constantly monitor the housing.

A suitable method for operating the valve is to use that used to generate steam as the coolant about 220 ° C cooled helium gas to use, or the line returning this cooled helium gas to the reactor accordingly

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tap and return the gas, after it has cooled the valves, back into this line.

The temperature of 220 ° C is only an example, In some reactor systems, helium gas flows with temperatures down to about 50 ° C are also available.

Exemplary embodiments of the invention are given below explained in detail with reference to the drawing, in the

Fig. 1 shows a schematic section of a high temperature valve in shows open position.

Fig. 2 shows the valve of Fig. 1 in the closed position.

Fig. 3 shows an alternative embodiment of the valve according to FIGS. 1 and 2.

Fig. 4 shows a high temperature valve in an inclined seat design.

Fig. 1 shows a high temperature valve TO with a housing 12, a main valve seat 14, a valve seat 16, a valve body 18 cooperating with the valve seats, and a Inlet 20 and an outlet 22.

The housing is just like the inlet line and the outlet line double-shelled, i.e. it has an inner wall and an outer wall 26, between which a e.g. ceramic heat insulating mass 28 is arranged. A jacket 30 provided with cooling fins can be arranged over the outer wall, e.g. made of metal, which is fitted with a large number of thermal sensors 32, e.g. thermocouples, in order to constantly monitor the outside temperature of the housing to be able to monitor.

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The hollow valve body 18 (valve disk) is provided with a heat-resistant ceramic coating 84 (Fig. 4), which cooperates with the valve seats 16 and 14 to close them.

The valve body 18 is by means of at least one Part of its length, the hollow piston rod 34 is actuated which, at its upper end in the drawing, is connected to a piston 36 is connected, which is arranged in a cylinder 38 and can be moved up and down in this with the aid of a suitable pressure medium is. The cylinder 38, which is connected to the housing 12 via an elongated chamber 40, is included for this purpose suitable connections 108 and 110 provided via which a suitable Pressure medium can be supplied and discharged.

The piston rod 40 extends from the piston 36 through the cylinder 38 and then thereafter through the chamber 40 and thereafter into the housing 12, in which it is connected to the valve body 18 in a manner still to be described.

The chamber 40, which is sealed off from the cylinder 38 by a seal 48 (FIG. 2), is in FIG. 2 by means of a transverse wall 42 an upper space 44 and a lower space 46 divided, the latter by means of a lower end wall 54 opposite the housing 12 is divided.

The housing 12, the chamber 40 and the cylinder 38 are in the rest of them connected to one another in a suitable manner, e.g. screwed or welded.

The upper space 44 of the chamber 40 is with an inlet 50 (or outlet) and the lower space 46 of the chamber 40 is with an Provide outlet 52 (or inlet). For the following description it is assumed that the coolant through the supply

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run 50 is introduced and discharged through the inlet 52. However, it is also an opposite coolant flow possible.

As Fig. 1 shows, the piston rod 34 is so far solid, that the massive part in the upper end position of the piston 36 downwards slightly over a seal 48 closing off or holding covenant 49 reaches out. The adjoining part of the piston rod up to the valve body 18 is hollow.

As FIGS. 1 and 2 show, part of the hollow piston rod 34 has through openings 56 in its wall provided, through which the coolant from the space 44 can enter the interior of the piston rod.

The passage openings 56 or the relevant area of the piston rod 34 always remain, i.e. also in the lower end position of the piston 36 within the space 44 and above the transverse wall 42, as FIG. 2 shows. The piston rod 34 passes through it the transverse wall 42, which is provided with an opening 58 for this purpose. A special seal is not required here, it is sufficient to make this opening 58 with a sufficiently narrow, however to form the unimpeded passage of the piston rod 34 enabling fit. The chamber 40 is otherwise the same as the housing 12 with cooling fins. 60 provided.

The lower in Figures 1 and 2 of the piston rod 34, which is constantly within the space 46 and below the Transverse wall 42 is located is surrounded by an expediently concentric tube 62, the inner diameter of which is greater than that Outer diameter of the piston rod, so that an annular space 66 is formed between the tube 62 and the piston rod 34.

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The upper end of the tube 62 in the drawing is at the end open and, as FIG. 1 shows, in the upper end position of the piston 36 it is at an axial distance from the transverse wall 42, while in the lower end position of the piston 36, as shown in FIG the lower space 46 of the chamber 40 separates from the interior of the housing 12. The end wall 54 is provided with a suitable through opening for the passage and axial movement of the pipe 62 is provided, the inside diameter of this opening being slightly larger than the outside diameter of the tube 62, as a result of which an annular gap 92 is formed (FIG. 2), the function of which will be discussed below.

The lower in the drawing, facing the valve body 18 Ends of the piston rod 34 and the tube 62 are fixed to one another by an approximately spherical connecting part 64, e.g. by welding, connected to each other.

As shown in particular FIG. 4, the connecting part 64 is provided with a central through opening 68, which the Mouth 70 at the lower end of the hollow piston rod 34 connects to an inlet opening 72 of the hollow valve body 18. That The connecting part also has at least one lateral through opening 74, which forms the annular space 66 between the tube and the piston rod connects to at least one outlet opening 76 of the valve body 18.

The valve body can, if necessary or desired, be provided with partitions 78 for stiffening, of which each has at least one through opening 80 in order to allow the coolant to enter and pass into the interior space 82 to enable the valve body.

The valve described so far works as follows:

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In the position shown in Fig. 1 / in which the main valve seat 14 is open, but the valve seat 16 is closed, so that the hot working medium can flow from the inlet 20 to the outlet 22, the entire valve body and those adjacent to it Parts due to the constant influx or flow of fresh, hot working fluid with a high temperature load exposed.

In order to cool the valve body, a coolant (e.g. cooled helium gas with a temperature of of about 220 ° C. or also helium gas with a temperature down to about 50 ° C.) is introduced into the space 44. This coolant enters the hollow piston rod through the openings 56 34, flows out of this through its mouth 70, the opening 68 in the connecting part 64, and through the inlet opening 72 in the Valve body 18 in its interior 82. If the valve body is provided with partition walls 78, as stated, so the coolant flows through their openings 80, fills the interior space 82 and then flows out through the outlet openings 76 and via the lateral channels or openings 74 in the connecting part 64 back through the annular space 66 between the tube 60 and the piston rod 34, from which it is at the end exits at the upper end of the tube 62 and enters the space 46. From this, the coolant flows through the drain from and, which is not shown, back into the tapped pipeline for further use.

The same coolant flow results in the valve position according to FIG. 2, in which the main valve 14 is closed and thus the flow of the working medium is interrupted.

In general, however, it is not necessary, in the position of FIG. 2, that is to cool the valve body with interrupted working medium flow, as with interrupted Work Equipment

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current cools the valve housing relatively quickly, around 5 ° per minute.

In this case, as will be explained, precautions are taken to shut off the coolant flow.

The valve body 18 is, as in particular FIG. 4, somewhat enlarged shows, equipped with a hollow extension or base 86, which is formed in one piece with the valve body or on it may be welded, and, as shown, the spherical connecting part 64 engages around and over, whereby the Valve body 18 is held on the connecting piece 64.

The outer diameter of the approximately spherical connecting part 64 and the inner diameter of the base 86 are chosen so that that a limited mobility of the valve body relative to the connecting part is possible, but nevertheless a safe one and reliable retention of the valve body on the connecting part is ensured.

The base 86 is now, as FIG. 1 shows, provided with at least one passage opening 88 through which the cooling gas in 1 flows to the valve seat 16, cools it and then through an annular space 90 between the base 86 and the wall piece 106 of the housing can flow off. This coolant then passes through the aforementioned annular gap 92 through and into the space 46, from which, as already described, it flows off via the drain 52.

In this way, the valve body 18, the valve seat 16 as well as all supply and connection parts, such as the piston rod 34, the pipe 62 and the connecting part 64 are cooled by the coolant.

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It should be mentioned again at this point that the The cooling flow can also run in the opposite direction, i.e. the coolant would in this case pass through the connection 52 enter the space 46, then through the annular space 66 to the valve body 18 and from this through the hollow piston rod and their openings 56 flow off to the connection 50. Furthermore, coolant would flow from the space 46 through the annular gap 92 into the annular space 90 flow in to cool the valve seat 16, and thereafter flow out through the openings 88.

When in the valve position according to Fig. 2, i.e. when the valve is closed Main valve and thus interrupted flow of working medium, the valve body is cooled, so can both through the openings 88 in the base of the valve body as well as through the annular gap coolant can enter the main line. If not is permissible, provision can be made that in this case, i.e. in the closed position of the valve according to FIG. the annular gap 92 and the openings 88 are closed. Usually, however, it is not necessary in practice to cool the valve body with the valve closed and it is also irrelevant if some of the coolant enters the main line during any cooling.

If the valve is closed and it is not necessary to cool the valve body, it is appropriate to use the cooling circuit switch off. For this purpose, suitable valves can be provided in the area of the connections 52 and 52 (or elsewhere).

Fig. 3 therefore shows an embodiment through which the The main valve closes, i.e. if the flow of working medium is interrupted, the coolant circuit also automatically closes is interrupted.

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For this purpose, the chamber 40 is provided with a further transverse wall 94 which is arranged at an axial distance from the transverse wall 42 is, so that a third, unspecified Kanuner is formed between the transverse walls 42 and 94. The dimensions are chosen so that the part of the hollow piston rod 34 with the openings 56 for the passage of the coolant is provided to lie between the two transverse walls 42 and 94 when the main valve is closed, as shown in FIG. 3 comes. The chamber between these two transverse walls is now against the space 44 by a seal 96 and against the space sealed by a seal 98 so that the coolant introduced via the connection 50 and into the space 44 is not can enter the hollow piston rod 34, so the flow of coolant is interrupted.

This applies to a flow path of the coolant from the inlet 50 to the outlet 52. Since the coolant flow can also flow from the connection 52 in the direction of the connection 50, is furthermore, the tube 60 is closed at its upper end by means of an end wall 100. However, so that the coolant is running The coolant flow can exit or enter the annular space 66, the tube 60 is in the region of its upper end, which protrudes beyond the end wall 54 when the main valve is closed, in its wall with at least one passage opening 102, but in the position shown in FIG. 3, i.e. with the main valve closed, by means of a seal 104 closed is. This means that even if the coolant is supplied through the connection 52, it is only fed into the space 46 can enter, but cannot continue to flow from it. The seal 104 also prevents any gases from escaping the main line can enter the space 46 and thus into the coolant circuit.

To close the valve against the pressure of the working

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by means of the required force, the piston rod acts on the valve body via the approximately spherical connecting part 64 18 transferred. The latter can for this purpose in its upper wall, in which the inlet opening 72 (Fig. 4) is formed, have a corresponding bulge adapted to the shape of the connecting part 64 for better pressure transmission.

The force required to close the valve seat 16, which is considerably less, is transferred via the end wall (not designated in more detail) of the holder 86.

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Claims (1)

Expectations High temperature valve, especially for reactor systems, with a housing, two valve seats formed in this, one cooperating with the valve seats Valve body which can be actuated by means of a piston rod that can be driven from the outside in order to open the valve seat or to close, characterized in that the piston rod (34) and the valve body (18) connected to it are hollow. Valve according to claim 1, characterized in that that the valve body is provided with a high temperature resistant, e.g. ceramic, coating (84) and that the inner walls of the housing and the connection lines preferably also with a high temperature resistant E.g. ceramic coating are lined. Valve according to Claim 1 or 2, characterized in that the piston rod (34) is in one elongated chamber (40) adjoining the housing (12) so as to be displaceable in its longitudinal direction is that the chamber (40) is divided by a transverse wall (42) into two essentially separate spaces (44, 46) is, each of which is provided with a connection opening (50 or 52) for the inlet or the outlet of the coolant is, and that the hollow piston rod (34) extends through the two spaces (44, 46) and that part of the Piston rod (34), which is located in the upper space (44) facing away from the valve body (18), in its circumferential wall is provided with through openings (56) for the coolant. Valve according to claim 3, characterized in that the through openings (56) in the wall of the 709836/0387 ORIGINAL INSPECTED. Piston rod (34) are arranged so that they are above the transverse wall (42) and always in the upper space (44) with the valve open and closed. 5. Valve according to claim 3 or 4, characterized in that the piston rod (34) in the lower Space (46) is surrounded by a tube (62) at a radial distance, so that between the piston rod (34) and an annular space (66) is formed in the tube (62). 6. Valve according to claim 5, characterized in that that the position of the tube (62) is chosen so that its upper open end when the valve is open axial distance from the transverse wall (42) and when the valve is closed over the lower end wall (54), the the lower space (46) separates from the interior of the housing (12), survives. 7. Valve according to claim 5 or 6, characterized in that a substantially hollow spherical Connection part (64) is provided, which the lower end of the tube (62) with the lower end the piston rod (34) connects. 8. Valve according to claim 7, characterized in that that the valve body (18) by means of a hollow base (86) connected to it, which the connecting piece (64) encompasses and overlaps, is movably connected to the latter. 9. Valve according to claim 7 or 8, characterized in that the connecting piece (64) with a central through opening (68), which connects the lower mouth (70) of the piston rod (34) with an inlet opening (72) - 16 709836/0387 of the hollow valve body (18) and is provided with, for example, two lateral through openings (74), the corresponding outlet openings (76) of the valve body (18) with the annular space (66) between the piston rod (34) and Connect the tube (62). 10. Valve according to claim 9, characterized in that that the hollow valve body (18) on both sides of its inlet opening (72) for stiffening with partition walls (78) is equipped, which have through openings (80) for the passage of the coolant. 11. Valve according to claim 8, characterized in that the hollow base (86) of the valve body (18) is provided with e.g. two outlet openings (88) for supplying the coolant to the upper valve seat (16), that furthermore, to discharge the coolant, the end wall (54) between the space (46) and the interior of the housing (12) is provided with an annular gap opening (92). 12. Valve according to claim 1, characterized in that that the chamber (40) is provided with two spaced apart transverse walls (42, 94) which are in such a way are arranged that when the lower valve seat (14) is closed, the through openings (56) in the wall of the hollow The piston rod (34) lie between the transverse walls (42> 94), and that seals (96, 98) are provided to keep the space between the transverse walls (42, 94) against the spaces (44, 46) to seal. 13. Valve according to claim 12, characterized in that that the tube (62) is closed at its upper end by means of an end wall (100) that it is in its ümfangswand in the protruding over the end wall (54) - 17 709836/0387 Area is provided with at least one through opening (102), which when the valve seat (14) is closed is closed by means of a seal (104). 14. Valve according to one of the preceding claims, characterized characterized in that the housing (12) and the inlet and outlet lines (20, 22) with a double wall are equipped and the space between the two walls (24, 26) with a heat insulating, e.g. ceramic mass are filled. 15. Valve according to claim 14, characterized in that over the outer wall (26) of the housing (12) a jacket (30) is arranged, which is provided with a plurality of temperature sensors (32) for monitoring the outside temperature of the housing is occupied. 16. A method for cooling a valve according to any one of claims 1 to 15, characterized that the cooled working gas is used as the coolant. 709836/0387