CZ9903462A3 - Discharge valve for tanks used for transportation of liquid harmful substances - Google Patents

Abstract

The invention relates to a dump valve (100) for containers provided for transporting liquid dangerous materials. The dump valve is connected to the container by the valve body (10) through which a valve opening (11) leads. The valve opening can be closed by a valve plate (15). The valve plate lies on the rim of the valve opening (11) in a closed position such that it seals. The aim of the invention is to provide a dump valve which guarantees passive security during accidents and also during long maintenance intervals while simultaneously simplifying and lightening the maintenance. To this end, the invention provides that the dump valve (100) has an encapsulated spiral spring (21) for returning and holding the valve plate (15) in a closed position. The spiral spring (21) is located inside the conical valve plate (15), and supports on the lower part (19) of the valve plate (15) and on the end of a guiding rod (13) which is provided for vertically guiding the valve plate (15) and which is guided through a continuous hole located inside the valve plate (15). The guiding rod is fixed on the valve body (10) and is arranged in the dead center of the valve opening (11).

Description

1999-3462

Outlet valve for tanks for transport of liquid dangerous substances

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to an outlet valve for tanks for transporting liquid hazardous substances which is connected to the tank by means of a valve body through which a through-opening is closed which is closable by a valve plate. a seal is provided and wherein the position of the valve disc is variable by means of a control unit having a lever arm guided by a lateral recess in the through hole.

BACKGROUND OF THE INVENTION

The tanks for the transport of liquid hazardous substances, which are preferably used in road transport as tank wagons, in rail transport as boiler wagons and also in container transport, have an outlet valve, which is usually screwed on an outlet flange which is arranged in the bottom of the tank .

EP 0430 664 β ^ Ι discloses a valve arrangement for liquids and gases in which the spindle is arranged tangential to the valve passage in the valve body on which

783 <X (78307a.doc) fixed flat disc valve closing element. The closing element moves from its position in which it covers the valve passage by means of a spindle. The arm connecting the closure element to the spindle is guided through an opening in the valve body in the region of the valve passage.

The disadvantage of this design is that the helical spring, which is arranged at one end of the spindle and serves to reliably close the valve, can relatively easily come into contact with partially aggressive hazardous substances, as they pass through the arm hole into and out of the spindle channel. may, under the condition of the horizontal arrangement of the spindle channel, extend slightly further into the region of the helical spring. Sealing of the lubricant or corrosion then reduces the functionality of the valve.

In addition, the spring outside the tank is a compromise with respect to passive safety with respect to the cleanability of the valve structure.

Further, GB 922-389 discloses a discharge valve for bulk material tanks which exhibits certain design features such as valves for liquid hazardous substances. This valve is designed to remain closed by the pressure of the bulk material.

For this purpose, a spring mechanism has been proposed whose tension is to achieve a reliable closure. However, the formation of mechanics is problematic, since its components come into contact with the bulk material, which often limits their functionality. Finally, it is not at known valves

78307 (78307a.doc) ensuring neither passive safety nor repairability and thus cleanability.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an outlet valve for tanks for the transport of liquid hazardous substances of a type that would guarantee passive safety in accidents as well as longer maintenance intervals while simplifying and facilitating maintenance.

This task is characterized by the characteristics of claim 1.

According to the invention, it is thus proposed to provide a drain valve having a sealed screw spring for resetting and holding the valve plate in a closed position which is arranged in the interior of the valve plate. The underside of the valve plate has a flat edge all around the circumference, which is provided with a gasket arranged in a groove in the valve plate. This edge or flat gasket, in the closed position, is flush with the valve body, so that the optimum seal with respect to the prior art is achieved by this wide contact of the valve plate.

The valve disc preferably consists of a lower part and a conical upper part, which are preferably screwed together.

In the through hole for emptying the tank there is a centrally arranged guide rod for the valve plate, and thus a guide

78307 (78307a.doc) the rod has a grip for attachment to the valve body. Furthermore, a lever arm of the control device protrudes into the through hole and is articulated to the lower part of the valve body. This ensures that a large part of the through hole is not filled by any devices, so that emptying is possible without hindrance.

The through hole is closed by a conical valve disc, with the tip of the cone protruding into the bulk material tank. The tapered helical spring arranged in the valve plate rests inwardly on the underside of the valve plate and the guide rod guided in through through bore in the underside of the valve plate, possibly against a stop fixedly attached to the end of the guide rod. so it closes. The through bore in the underside of the valve plate is designed as a sliding bushing in which a guide rod is mounted for vertical guidance. When opening the drain valve, the valve plate is lifted from the valve body according to the guide rod, while the screw spring is tensioned so that closing after emptying is promoted.

Furthermore, the proposal

to actuate the control unit manually, pneumatically or in any other suitable manner.

The guide sleeve is preferably coated so that consumable lubrication is unnecessary.

By providing an outlet valve according to the invention only with

liquid material, avoid / avoid this material from coming into contact with corrosion hazard parts.

78307V8307a.doc)

In addition, the hazardous liquid material cannot be contaminated by contaminating any component in its function, in particular the flexible devices for closing the drain valve, since the liquid substance would have to move against the gravitational force so that a reliable closing of the drain valve is guaranteed. The drain valve according to the invention advantageously offers an increased passive safety due to the internally mounted screw spring, while the conical design of the valve plate makes it possible to clean the drain valve without shadows. The replacement of the gasket is possible by unscrewing the upper part of the valve plate without any problems, which significantly increases the service comfort.

Further advantageous embodiments are characterized in the subclaims.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in more detail below with reference to the drawings. These include:

Fig. 1 is a partial cross-sectional side view of the outlet valve according to the invention in a closed condition; Fig. 2 is a partial cross-sectional side view of the outlet valve according to the invention;

DETAILED DESCRIPTION OF THE INVENTION

78307 (78307a.doc)

The discharge valve 100 according to the invention consists of a valve body 10, which is a discharge valve 100 connected to a tank (not shown) for liquid hazardous substances. The valve body 10 has a through hole XI through which it is emptied and in which region the movable parts of the outlet valve 100 are disposed. The holder 12 for the guide rod 13 is arranged to protrude into the through hole XX. The guide rod 13 is held at one end 14 by the holder 12 in the through-hole 11 in FIG.

Wednesday. A valve plate 15 is slidably mounted on the guide rod 13, wherein the valve plate 15 is articulated to the control unit 16 to control the opening and closing of the discharge valve 100 adjacent the guide rod holder 12.

The valve plate 15 is already located inside the tank and abuts the edge 17, which extends all the way around the bottom, on the valve body 10 and thus seals the tank. The valve plate 15 consists of an upper part 18 and a lower part 19, which are screwed together. The top part 18 is conical, so that the bulk material can be removed from it completely. A gasket 20 is clamped between the top portion 18 and the bottom portion 19, the gasket 20 having the same outer diameter as the upper portion 18 which is larger than the diameter of the through hole 11 and the outer diameter of the lower portion.

19, so that the gasket 20 is pressed by the topsheet 20 on the valve body XX. A thrust pressure is achieved by a conical converging helical spring 21 (FIG. 3) which is arranged in the interior space 22 of the valve plate 15. The conical shape of the helical spring 21 is adapted to the conical shape of the upper part 18 of the valve plate 15. The seating surface of the spring is on the lower part 19 of the valve plate 15 and is provided between the slide bush 23 for the guide rod.

78307a) inserted into the valve plate 15 and the raised edge 25] provided with one thread 24 for screwing the upper part 18 and the lower part 12. The other side 26 of the screw spring 21 rests against the end 27 of the guide rod 11 which is located in the plate When the outlet valve 100 is opened by the control unit 12, the screw spring 21 is compressed (FIG. 2). After emptying, the valve plate 11 is brought back into contact with the valve body 10 by means of the tensioned screw spring 21. The sliding bush 23 is formed in one piece with the lower part 19 of the valve plate 12 and has a coating 21, such as teflon or the like, on its sliding surfaces 30 to reduce friction. The control unit 16 may be driven manually or pneumatically or in any other suitable manner. The control unit 16 consists of a lever arm 32 which is articulated to the lower part 19y or directly outside to the sliding sleeve 23. The lever arm 32 is moved by means not shown here, while it is still articulated to the valve body 12. However, this pivot point is not located directly in the region of the through hole 11, but in the lateral recess 33 of the through hole 11. On the side of the outlet valve 100 opposite to the tank, the valve is provided with a connecting piece 34. which is shown only partially here.

Claims (16)

1. Outlet valve -I-4-θΌ -) - for tanks for the transport of liquid dangerous substances, which is connected to the tank by means of a valve body (10) through which a through hole (11) is closed, which can be closed by a valve plate (15); which, in the closed state, is close to the edge of the through hole (11), wherein a seal is arranged between the valve plate (15) and the edge and wherein the position of the valve plate (15) is variable by a control unit (16) having an arm (32) a lever, which is guided by a lateral recess (33) in the through hole (11), characterized in that the discharge valve (100) - is sealed by a screw spring (21) for resetting and holding the valve plate (15) in the the screw spring (21) is located in the interior of the valve cone plate (15) and is supported on the bottom plate (19) for the vertical guiding of the valve plate (15) the valve body (15) and at the end of the guide rod (13)> guided into the interior of the valve plate (15) by a through bore (10) which is fixedly attached to the valve body (10) and is arranged in the center of the through bore (11) ), wherein the underside of the valve plate (15) facing the valve body (10) has a flat edge (17) all around the circumference, which is provided with a flat gasket (20) which in the closed position abuts the valve body (10) in a plane. 2. team An outlet valve according to claim 1, characterized in that the helical spring converges conically. 16 78307 (78307a.doc) Drain valve according to claim 1 or 2, characterized in that the lower part (19) of the valve plate (15) has a recess surrounding the through bore in which the helical spring (21) is supported. Drain valve according to one of Claims 1 to 3, characterized in that the end (27) of the guide rod (13) on which the screw spring (21) is supported is provided with a stop. Drain valve according to claim 4, characterized in that the stop comprises a washer (29) which is slid onto the end (14) of the guide rod (13) and secured by the nut (28). An outlet valve according to any one of claims 1 to 5, characterized in that the through bore is formed as a sliding sleeve (23), whereby the coating (31) can be provided with a coating (31) for improving the sliding conditions. Drain valve according to one of Claims 1 to 6, characterized in that the valve plate (15) consists of a bottom part (19) and a conical top part (18). An outlet valve according to claim 7, characterized in that the lower part (19) and the upper part (18) are connected to one another in a detachable or non-detachable manner. An outlet valve according to claim 7, characterized in that the lower part (19) and the upper part (18) are screwed together by a thread (24). 16 78: (78307a.doc) An outlet valve according to any one of claims 1 to 9, characterized in that the valve plate (15) has a groove for receiving the gasket (20) directly below the peripheral edge. An outlet valve according to claim 10, characterized in that the groove is arranged in the region of contact between the lower part (19) and the upper part (18). Drain valve according to any one of claims 1 to 11, characterized in that the control unit (16) is driven mechanically, pneumatically or otherwise, wherein the valve plate (15) moves ¹ along the guide rod (13). Drain valve according to one of Claims 1 to 12, characterized in that the lever arm (32) is articulated to the underside of the valve plate (15). 14th discharge valve according to claim 13, characterized in that the second end of the arm (32) of the lever is hingedly attached to the spindle, which ^ ^- is located in a side recess (33) of the through opening (11). Outlet valve according to one of Claims 1 to 14, characterized in that a connection piece (34) is fixedly connected to the through-hole (11) on the outside of the valve body (10), which can have connecting pieces. elements. Drain valve according to one of Claims 1 to 15, characterized in that the encapsulated helical spring Z (21) is arranged in the inner space of ta-n-ktt and held (12) by (1) -ge — arranged — so that it lies closely and refueling passive safety in accidents.