DE102004040026A1 - Emergency valve for tank-shaped vessel of coach e.g. omnibus for holding liquid or gaseous material whereby valve opens before reaching explosion limit and drains vessel-content by inlet and outlet pipes without further increase in pressure - Google Patents

Abstract

The emergency valve is opened before reaching the explosion limit of the tank-shaped vessel. The valve diverts the vessel-content (11) through inlet opening (5) and outlet opening (9) without further increase in pressure in the permitted pressure range. The inlet openings facing the inner area of the vessel are closed by a ring piston (3) charged by the spring force.

Description

The The invention relates to an emergency valve for tank-like containers, in particular rail vehicles for holding liquid or gaseous substances.

Rail vehicles, Buses and stationary facilities, such as machinery and buildings, are often with tank-like containers equipped, the liquid or gaseous Contain substances. These substances can be flammable, toxic and / or be explosive, especially if exceptional incidents are too fast pressure increases or warming above the safe operating condition. In accidents with Vehicles or collisions of objects with fixed equipment it can cause sudden damage come in the form of compression and deformation of the container shell and therefore too sudden high changes the volume with the result of pressure increases in the container. Depending on filling level can the allowed Bursting pressure of the container quickly crossed and the container shell breaks. Parts of the container contents are then forced out under pressure through these cracks in the container shell and uncontrolled distributed in the area and reach if necessary on hot parts and / or Materials which, in conjunction with the contents of the container, endanger and Lead to contamination. For liquids can be a fine atomization occur with the consequence of high fire hazard.

Known are valves for the ventilation of tank-like containers and used to compensate for the pendulum volume. These valves are but not designed for big changes of the Volume within the shortest possible time Time without the allowable Internal pressure of the container To exceed.

Of the Invention has for its object to provide an emergency valve, in case of extraordinary incidents (accidents, collisions) a tearing the tank-like container safely prevents and the container contents so derives that the environment is not endangered.

These Task is inventively characterized solved, that the emergency valve before reaching the bursting pressure of the tank-like Container opens and the container capacity without additional Pressure increase in the permissible Pressure range of the container through inlet openings and an outlet opening derives.

The Emergency valve according to the invention is advantageously capable of large volume flows in the shortest possible time in a given direction with full beam in the allowable pressure range of the container derive. This will result in a sudden tearing of the container shell Pressure increase prevented. The potential danger with regard to fire, Contamination and poisoning by the container contents is significantly reduced or even completely switched off.

advantageous Embodiments of the invention are specified in the subclaims.

embodiments The invention are illustrated in principle in the drawing and will become closer described. Show it

1 an emergency valve in section along the line AA in 3 arranged at the top of a tank-like container, in the closed state,

2 the emergency valve after 1 in open condition,

3 the top view too 1 and 2 .

4 the same emergency valve, but rotated by 180 ° arranged at the bottom of a tank-like container, in the closed state,

5 the emergency valve after 4 in open condition.

The so-called emergency crash valve consists of a flange cover 1 and a cup-shaped flange housing 2 with an outer piston guide 2a and an inner piston guide 2 B , Between these two guides 2a and 2 B is an annular piston 3 with an outer seal 3a and an inner seal 3b stored. The ring piston 3 is due to several springs 4 in his guides 2a and 2 B held and against one in the flange housing 2 trained stop surface 2c pressed. Instead of several springs 4 is also a single large spring possible whose diameter on the one hand of the ring piston 3 corresponds, this spring can taper to the other side.

The flange housing 2 is to the interior of the container with sufficiently large, in the region of the annular piston 3 placed inlet openings 5 Mistake. The flange cover 1 and that into a valve opening 6a the wall 6 the container used flange housing 2 are under arrangement of suitable seals 7 by screws 8th with a reinforcing ring 6b the wall 6 connected.

With an increase in the internal pressure in the tank-like container over the usual pressure in the operating range, but still below the bursting pressure, the annular piston 3 against the power of the springs 4 from the stop surface 2c moved out of its piston seat (see 2 and 5 ). This will set the maximum total area of the inlet openings 5 released and via an outlet opening 9 made a connection to the atmosphere. Through this outlet opening 9 will so much of the contents of the container 11 pushed out until the usual internal pressure in the container sets again.

The crash emergency valve can - as in 1 and 2 shown - be mounted on the top of the tank-like container. Here, the emergency valve is above the level, so that it is not exposed to the changing static pressure of the container contents. In this arrangement at the top is the outlet opening 9 through an outlet pipe 10 supplemented, for which the flange housing 2 a pipe guide 2d having. The outlet pipe 10 extends through the container and opens down into the atmosphere. Depending on the requirement, in which direction the container contents 11 is to be derived (for example, always away from hot parts), the lower portion of the outlet pipe 10 be shaped accordingly, for example by a curvature.

According to 4 and 5 is the emergency crash valve in the area of the lower tank wall 6 arranged. This valve has a sufficiently large outlet opening 9 in its flange cover 1 , which is created in a simple manner by that in the arrangement according to 1 and 2 in this flange cover 1 sealed stopper 12 Will get removed. In the arrangement according to 4 and 5 is the stopper 12 in the pipe guide 2d of the flange housing 2 and close it tight. The outlet opening 9 can also be described with the already described in 4 and 5 not shown outlet pipe 10 be combined.

Alternatively to the in the 1 and 2 respectively. 4 and 5 As shown, the crash emergency valve can be mounted in the side walls of the tank-like container, in which case a suitably shaped outlet tube 10 is appropriate.

The crash emergency valve described so far is designed so that it can be used at any point of the tank-like container (top, bottom, side). If this equality of the valve member is not desired, it is understood, especially on the plug 12 to renounce. The so modified valve for placement on the top of the tank-like container (see 1 and 2 ) would then have a continuous flange cover 1 So without a recording for the stopper 12 , In one for an arrangement at the bottom of the tank-like container (see 4 and 5 ) modified valve would be the flange cover 1 an outlet opening 9 without grooves and the flange housing 2 a closed floor and no pipe routing 2d exhibit.

1

flange

2

flange

2a

outer piston guide

2 B

inner piston guide

2c

stop surface

2d

pipe guide

3

annular piston

3a

outer seal

3b

inner poetry

4

feather

5

inlet port

6

wall a tank-like container

6a

valve opening

6b

reinforcement ring

7

poetry

8th

screw

9

outlet

10

outlet pipe

11

container capacity

12

Plug

Claims (10)

Emergency valve for tank-like containers, in particular rail vehicles, for receiving liquid or gaseous substances, characterized in that the emergency valve is designed so that it opens before reaching the bursting pressure of the tank-like container and the container contents ( 11 ) without additional pressure increase in the permissible pressure range of the container through inlet openings ( 5 ) and an outlet opening ( 9 ). Emergency valve according to claim 1, characterized in that the interior of the container facing inlet openings ( 5 ) for the container contents ( 11 ) by one with the force of at least one spring ( 4 ) acted upon annular piston ( 3 ) are closed, wherein the inlet openings ( 5 ) before reaching the bursting pressure of the tank-like container by lifting the annular piston ( 3 ) are released against the spring force, and the container contents with full flow through the outlet ( 9 ) drains off. Emergency valve according to claim 2, characterized in that the inlet openings ( 5 ) on a pot-like flange housing ( 2 ) are formed. Emergency valve according to claim 3, characterized in that the flange housing ( 2 ) Guides ( 2a . 2 B ) for the ring piston ( 3 ) having. Emergency valve according to one of claims 1 to 4, characterized in that the outlet opening ( 9 ) through an outlet tube ( 10 ) whose lower region is dependent on the requirement in which direction the container contents ( 11 ) is to be derived (for example, always away from hot parts) is shaped accordingly. Emergency valve according to one of claims 1 to 5, characterized that it is optional at the top or bottom of the tank-like container can be used. Emergency valve according to claim 6, characterized in that when used at the top of the tank-like container, the flange housing ( 2 ) the outlet opening ( 9 ) having. Emergency valve according to claim 7, characterized in that the flange housing ( 2 ) with a pipe guide ( 2d ) for the outlet pipe ( 10 ) is provided. Emergency valve according to claim 6, characterized in that when used on the underside of the tank-like container, the outlet opening ( 9 ) in a flange housing ( 1 ) closing flange cover ( 1 ) is provided. Emergency valve according to one of claims 6 to 9, characterized in that depending on the location of the emergency valve, either the flange ( 1 ) or the flange housing ( 2 ) a stopper ( 12 ).