WO2020011881A1

WO2020011881A1 - Relief valve

Info

Publication number: WO2020011881A1
Application number: PCT/EP2019/068600
Authority: WO
Inventors: Emanuel Hummel; Matthias GÖPFERT
Original assignee: Hoerbiger Wien Gmbh
Priority date: 2018-07-13
Filing date: 2019-07-10
Publication date: 2020-01-16
Also published as: CN112368498A; AT521399A1; KR20200000178U; AT521399B1; KR20210030934A; CN208951368U; KR200494011Y1; CN112368498B

Abstract

The invention relates to an explosion protection valve (1), which is simple and cost-effective to produce and by means of which deposits on the valve seat in particular can be reduced, wherein: a first end face (DA1) forming a first sealing area (DF1) and a second, opposite end face (DA2) forming a second sealing area (DF2) are provided on the sealing element (16); in the closed state of the explosion protection valve (1), the valve plate (15) contacts the first end face (DA1) in a sealing manner and the second end face (DA2) is exposed at least in part, in order, in the assembled state of the explosion protection valve (1), to contact the wall (3) directly in a sealing manner or a fastening flange (20) arranged on the wall; an inner, continuous sealing inner peripheral area (23) is provided on the sealing element (16) which connects the first end face (DA1) and the second end face (DA2); the sealing element (16), having an outer sealing outer peripheral area (28), opposite the sealing inner peripheral area (23), which connects the first end face (DA1) and the second end face (DA2), is arranged on the valve seat element (5); and the sealing inner peripheral area (23) peripherally delimits the valve seat opening (VO).

Description

relief valve

The invention relates to a relief valve in the form of an explosion protection valve for arrangement on a wall opening of a wall of a work space to relieve the work space when a predetermined opening pressure is exceeded when an inflammable medium in the work space is exploded, with a valve seat element with a valve seat opening, with a valve plate, which in the closed state of the Explosion protection valve closes the valve seat opening and one, on the valve seat element between the

Valve seat element and the valve plate arranged one-piece sealing element which is in contact with the valve plate in the closed state of the explosion protection valve, wherein the valve plate can be lifted from the sealing element when the predetermined opening pressure is exceeded to release the valve seat opening.

Relief valves are used, for example, as explosion protection valves for pressure relief in closed work spaces in the event of an explosion. Such workrooms can e.g. Be crankcase of internal combustion engines, which must be relieved in the event of an explosion from the sudden increase in pressure as a result of the explosion in the crankcase in order to avoid damage in particular. But there are also other closed work rooms that have to be protected by relief valves in the event of an explosion. Explosions are particularly at risk e.g. closed work rooms, in which powdery combustible media are handled, since a dust explosion can occur relatively easily here. Mixtures of dust and air are explosive if the dust consists of combustible material such as B. coal, flour, wood, cocoa, coffee, starch or cellulose. Inorganic substances and elements such as magnesium, aluminum and even iron and steel are also explosive (or at least flammable) in this form. In addition to the flammability, the small particle size of the dusts is crucial. H. the explosive effects increase with decreasing particle size, since this increases the surface of the dust particles. These effects mean that even materials that are considered non-flammable in a compact form can burn in this finely divided form. Various electrical or mechanical effects with sufficient temperature and energy density can serve as the ignition source. A spark can

suffice the z. B. is caused by pulling an electrical plug or malfunction in electrical equipment. Another major source of danger is electrostatic electricity, e.g. B. by electrostatically charged clothing, but also in funding (rubber conveyor belts or the like), which can generate considerable electrostatic voltages and charges due to their friction and movement.

Other ignition sources include hot surfaces (e.g. in production environments), grinding or friction sparks and bearing damage. Explosion relief valves are generally known in the prior art.

For example, show DK 91047 C, KR 101800799 B1, CN 204512564 U, DE

212012000084 U1, AT 6424 U1. AT 31 1 129 B, ES 312337 A3, KR100928079 B1,

KR100981453 B1, WO 09136674 A1, DD87441 A Explosion protection valves in various configurations, an annular groove and a seal in the form of an O-ring being provided on the valve seat for sealing between the valve plate and the valve seat. A disadvantage of such an embodiment is, on the one hand, the relatively high manufacturing outlay for the valve seat, since in particular the groove for the O-ring has to be manufactured very precisely in order to ensure a good seal. Another disadvantage is that due to the contact of the valve seat with the work area, especially with aggressive media in the work area, high-quality, corrosion-resistant materials have to be used for the valve seat, which is cost-intensive. In addition, a gap forms on the valve seat in the area of the seal, where deposits can form, which is particularly important in sensitive hygiene applications, such as in the food or pharmaceutical industry, is disadvantageous. It is also not always possible to achieve the desired tightness and replacing the seal for maintenance purposes is relatively complex. The CN 206233978 U shows an explosion protection valve with a flat seal between the valve seat and valve plate and with a connecting pipe including a mounting flange for mounting.

In addition to explosion protection valves, there are many other valves in the prior art, for example for flow control of liquid or gaseous media. JP S51 100328 U, JP S63126677 U, disclose e.g. spring operated valves. The US

2015/0377107 A1, JP S61206171 U and JP S 50100133 U show examples of

positively controlled valves by means of actuators. There are also valves that are integrated in devices, for example in marine engines or serving devices as shown in US Pat. No. 6,834,624 B1, US Pat. No. 4,674,449 A or GB 473,901 A.

It is therefore an object of the invention to provide an explosion protection valve which overcomes these disadvantages. In particular, the explosion protection valve should be simple and inexpensive to manufacture and deposits on the valve seat should be reduced, in particular avoided.

According to the invention, the object is achieved in that a first end face forming a first sealing surface and an opposite second end face forming a second sealing surface are provided on the sealing element, the valve plate sealingly abutting the first end face and the second end face at least in the closed state of the explosion protection valve is partially free to in the assembled state of the

Explosion protection valve to seal directly against the wall or against a mounting flange arranged on the wall, so that an internal, continuous seal inner circumferential surface is provided on the sealing element, which is the first Connects end face and the second end face and that the sealing element with an outer seal outer peripheral surface opposite the seal inner circumferential surface that connects the first end face and the second end face on

Valve seat element is arranged, and that the seal inner peripheral surface

Valve seat opening limited peripherally. By shielding the valve seat by means of the sealing element from a process medium in the work space, a less expensive material can be used to manufacture the valve seat element. In addition, less stringent requirements are placed on the manufacturing accuracy of the valve seat element, in particular on the flatness, as a result of which the valve seat can be manufactured more cost-effectively. The valve seat element can also be structurally simpler, which enables weight savings. In addition, the sealing element can also serve to seal against a fastening flange or against the wall, which means that a separate seal can be dispensed with.

Advantageously, the explosion protection valve has a fastening means for fastening the explosion protection valve to the wall of the work space, whereby as

Fastening means is preferably provided a plurality of fastening screws with which the explosion protection valve can be screwed to the wall of the work space. The advantage of screws is that they are inexpensive standard products and that they can be easily opened and screwed back on.

A flame absorber is preferably provided in the explosion protection valve to prevent the flame from spreading from the working space through the explosion protection valve, the flame absorber preferably being in the form of a plate pack consisting of a plurality of sheet metal plates arranged one above the other. This can reliably prevent flames from escaping in the event of an explosion in the work area, which increases safety for people and reduces the risk of fire.

The explosion protection valve preferably has a suspension unit, which is provided to pretension the valve plate against the sealing element in the closed state of the explosion protection valve, with the

Suspension unit is preferably designed as a coil spring with preferably a linear, progressive or degressive spring characteristic. This enables a simple and inexpensive standard machine element to be used.

A circular valve seat opening and a corresponding circular valve plate are preferably provided, the sealing element as one

rotationally symmetrical sealing ring is designed. This creates an essentially cylindrical explosion protection valve that is simple and inexpensive to manufacture. Through the circular shape of the openings, the valve plate and in particular the sealing ring, a good sealing effect is achieved and deposits are reduced

It is advantageous if the first end face and the inner circumferential surface of the seal form a first main sealing lip, which is in contact with the valve plate when the explosion protection valve is closed. It is also advantageous if the first end face and the sealing outer circumferential surface form a second main sealing lip, which in the

the closed state of the explosion protection valve is in contact with the valve plate. This can improve the sealing effect.

To further improve the sealing effect on the first face of the

Sealing element at least one secondary sealing lip may be provided, which lies between the first and second main sealing lip and / or that at least one secondary sealing lip is provided on the second end face of the sealing element, which lies between the outer sealing surface and the inner sealing surface.

A valve seat element projection which extends inward in the direction of the valve seat opening is preferably provided on the valve seat element, and a seal element cutout for arranging the

Sealing element provided on the valve seat element projection, wherein the valve seat element according to an advantageous embodiment, a first disc-shaped valve seat component with a first central valve seat component recess and a second disc-shaped adjoining it in the closing direction of movement of the valve plate

Has valve seat component with a second central valve seat component recess, the first valve seat component recess for forming the

Valve seat element projection, is smaller relative to the second valve seat component recess. As a result, the manufacture of the valve seat element and consequently the manufacture of the entire explosion protection valve can be simplified and a good fit and simple assembly of the sealing element can be achieved.

The subject invention is explained in more detail below with reference to FIGS. 1 a to 4 b, which show exemplary, schematic and non-limiting advantageous embodiments of the invention. It shows

1a an explosion protection valve known in the prior art,

1b shows a detailed view of the valve seat,

2a an explosion protection valve according to the invention in the closed state,

2b shows a detailed view of the valve seat of the invention

Explosion protection valve, 3 the explosion protection valve according to the invention in the open state,

4a shows a sealing element of the explosion protection valve according to the invention in a first embodiment and

4b shows a sealing element of the explosion protection valve according to the invention in a further embodiment.

1 shows a cylindrical explosion protection valve 1 known in the prior art in a sectional view. The explosion protection valve 1 is arranged on a wall opening 4 of a wall 3 of a closed work space AR that the

Explosion protection valve 1 in the closed state of the explosion protection valve 1 seals the working area AR from an environment AT of the closed working area AR. The explosion protection valve 1 has a valve axis VA, an outer one

Valve housing 2 and a valve seat element 5, which are held together by means of several clamping elements 6, here in the form of clamping screws 6a. Between the

Valve housing 2 and the valve seat element 5 are arranged spacer elements 7 which e.g. can be designed as (not shown) spacer sleeves around the clamping screws 6a or in one piece with the clamping screws 6a, as can be seen in FIG. The spacer elements 7 are used to connect the valve housing 2 and the valve seat element 5 at a certain distance in the axial direction of the explosion protection valve 1 from one another in a substantially rigid manner. Corresponding threaded bores 8 are provided in the valve seat element 5 for screwing in the clamping screws 6a and there are for screwing the clamping screws 6a to the valve housing 2

Screw nuts 9 are provided, which are screwed onto threaded sections of the clamping screws 6 a, which protrude beyond the valve housing 2.

In the axial direction between the valve housing 2 and the valve seat element 5 and in the radial direction on the outside of the explosion protection valve 1, a flame absorber 10 is arranged, which is designed here in the form of laminated laminations. In the event of an explosion in the working space AR, the flame absorber 10 serves to prevent any flames from penetrating into the environment AT through the explosion protection valve 1 when the explosion protection valve 1 is open. The

Explosion protection valve 1 is with fasteners 11, here in the form of

Fastening screws 1 1a, attached to the wall 3. To screw the

Fastening screws 1 1a 3 corresponding threaded holes 12 are provided in the wall. Again, a spacing element 7 can be arranged around the fastening means 11 between the valve housing 2 and the valve seat element 5, which in the example shown is designed as a spacing sleeve 7a. On the inside of the valve housing 2, a suspension unit 13 is arranged, which rests with an axial end on the valve housing 2 and whose opposite axial end rests on a valve plate 15. The suspension unit 13 prestresses the valve plate 15 in the closed state of the explosion protection valve 1 with a defined pretensioning force against the valve seat element 5 in order to close the wall opening 4 of the wall 3 and thus the working space AR. On the valve seat element 5, a sealing element 16 in the form of an O-ring is arranged between the valve plate 15 and the valve seat element 5, which seals the valve plate 15 against the valve seat element 5 (in the closed state of the

Explosion protection valve 1) seals.

1b shows a detailed view of the area of the seal between valve plate 15 and valve seat element 5 marked in FIG. 1a. The sealing element 16, which is embodied here as an O-ring, is seated in a sealing groove 17 which runs essentially in a ring on the valve seat element 5. To achieve a sufficiently good sealing effect, the

Design of the sealing groove 17 is of crucial importance. The sealing groove 17 has a complex geometry, must be very precise, i.e. are manufactured with small dimensional tolerances and must also be very smooth, i.e. have a low roughness and be flat. Naturally, this requires a high manufacturing effort, since that

Valve seat element 5 has to be mechanically processed, e.g. the surface of the valve seat element 5 facing the valve plate 15 must first be machined, e.g. by milling or turning and then the sealing groove 17 can be produced, which can be done, for example, by turning, provided that the sealing groove, as here, is a rotationally symmetrical sealing groove.

The production of the valve plate, which is generally carried out by deep drawing, is relatively complex in the conventional design of the explosion protection valve in order to achieve sufficient tightness. In particular, are very high

Accuracy requirements are placed on the flatness of the valve plate, which cannot always be met adequately.

In addition to the relatively high manufacturing outlay for producing the sealing groove, when the explosion protection valve 1 is closed, a gap area is formed in the area of the sealing element 16 between the valve plate 15 and the valve seat element 5, as shown in FIG. 1b. This gap area is particularly disadvantageous when the explosion protection valve 1 is used for hygiene applications, for example in the food or pharmaceutical industry, where there are sometimes very strict legal requirements regarding cleanliness. If, for example,

perishable food is handled, there is a risk that deposits form in the gap area, which can possibly lead to the formation of germs, which is disadvantageous in any case. 1a also shows that the valve seat element 5 on the radially inner side is essentially in direct contact with the working space AR and the working medium handled therein. When the explosion protection valve 1 is used with aggressive, highly corrosive media in the work area AR, it is generally necessary for the valve seat 5 to be made from a correspondingly corrosion-resistant and consequently expensive material, which is disadvantageous from an economic point of view.

According to the invention, an explosion protection valve 1 is therefore designed with a specially shaped sealing element 16, as shown in FIGS. 2a, 2b and 3. At the

Sealing element 16 is provided with a first end face DA1 forming a first sealing surface DF1 and an opposite second end face DA2 forming a second sealing surface DF2, wherein in the closed state of the explosion protection valve 1 the valve plate 15 seals against the first end face DA1 or the formed sealing surface DF1 , is present and the second end face DA2 is at least partially free. That means that

Explosion protection valve 1 can be arranged adjacent to a component, for example a wall 3 of a work space AR, when used with the free end face DA2. The sealing element 16 also has an internal, continuous sealing inner circumferential surface 23 which connects the first end face DA1 and the second end face DA2. The seal element 16 is arranged on the valve seat element 5 with a seal outer circumferential surface 28 opposite the inner circumferential surface 23 of the seal, which connects the first end face DA1 and the second end face DA2. As a result of the configuration according to the invention, the sealing element 16 also serves for sealing against the valve plate 15 and also for direct sealing against one

Fastening flange 20 or opposite wall 3, which means that a separate seal can be dispensed with (see FIGS. 1a and 1b seal between valve seat element 5 and wall 3).

2a shows an explosion protection valve 1 according to the invention with a valve axis VA in a sectional view, which is arranged at a wall opening 4 of a wall 3 of a working space AR. The structure of the explosion protection valve 1 corresponds in principle to the explosion protection valve 1 shown in FIG. 1a. The explosion protection valve 1 has a valve housing 2 which is fastened to the wall 3 by means of a fastening means 1 1, here fastening screws 1 1 a (not in the sectional plane ), which are screwed into (not shown) threaded bores 12 of the wall 3. The explosion protection valve 1 has clamping elements 6 distributed over the circumference, clamping screws 6a in the example shown, in order to hold the explosion protection valve 1 axially together. At the outer ends of the clamping elements 6 facing away from the valve housing 2, too

Carrying elements 19 are provided, which are designed here in the form of screw eyes, which are screwed, for example, onto threaded sections of the clamping screws 6a. The explosion protection valve 1 can be handled more easily by means of the carrying elements 19 or screw eyelets, for example by being attached to a crane hook, which is particularly advantageous in the case of a heavy version of the explosion protection valve 1, since it facilitates assembly.

The explosion protection valve 1 also has a suspension unit 13, which is designed here as a conical helical spring 14, preferably with a non-linear spring characteristic. A non-linear spring characteristic means that a spring stiffness c of the coil spring 14 changes depending on the path I by which the coil spring 14 is compressed, the path I in the specific case corresponding to the so-called valve stroke H _{x of} the explosion protection valve 1. The valve stroke H _x is thus the distance between the closed position and the open position of the valve plate 15. The nonlinear spring characteristic can be progressive or degressive, the

Spring constant c increased with a progressive spring characteristic over the path I and decreased with a degressive spring characteristic over the path I. This can mean, for example, that a certain first opening force Fo1 is required to lift the valve plate 15 to the first 10% of the valve stroke H _x and a certain second opening force Fo2 is required to further lift the valve plate 15 to the second 20% of the valve stroke H, which is greater (progressive) or less (degressive) than the first opening force Fo1. So that can by the design of the coil spring 14

Opening characteristics of explosion protection valve 1 can be set. Of course, a helical spring 14 with a linear spring characteristic could also be used, the spring constant c remaining constant over the path I.

However, it would of course also be conceivable for other types of springs to be used as suspension units 13, e.g. Ring springs, Evolut springs, diaphragm springs, disc springs, etc. Also, for example, a known air spring could be used, which would have the advantage that the spring stiffness c and thus the opening characteristic of the

Explosion protection valve 1 could be changed via the air pressure of the air spring.

As a result, the explosion protection valve 1 could be adapted very flexibly to various applications with variable opening pressure, the opening pressure corresponding to the pressure in the working space AR at which the valve plate 15 starts to lift off from the valve seat element 5.

In the closed state of the explosion protection valve 1, the valve plate 15 lies sealingly on the sealing element 16 and is relative to in the direction of the valve axis VA

Sealing element 16 is movably arranged. The valve plate 15 closes the

Valve seat opening VO of the explosion protection valve 1 in the closed state and releases the valve seat opening VO when the valve plate 15 is lifted off the sealing element 16, as a rule by the pressure applied to the valve plate 15. The Explosion protection valve 1 has, according to the invention, a special sealing element 16 and a valve seat element 5 which cooperates therewith. The sealing element 16 has a first sealing surface DF1 on the first end face DA1, which, when the explosion protection valve 1 is closed, bears sealingly against a valve plate inner surface 15a of the valve plate 15. The second end face DA2 of the sealing element 16 opposite in the direction of the valve axis VA has a second, exposed sealing surface DF2. The first

The end face DA1 and the second end face DA2 are connected on the inside (facing the valve seat opening VO) by a continuous seal inner circumferential surface 23, the seal inner circumferential surface 23 simultaneously forming the peripheral boundary of the valve seat opening VO, and on the opposite side by a seal Outer peripheral surface 28 connected. By designing the sealing element 16 and in particular the inner circumferential surface 23 of the seal as a continuous surface that forms the peripheral boundary of the valve seat opening VO, any joints in the area of the valve seat opening VO can be minimized as far as possible, whereby the risk of deposits on the explosion protection valve 1 can be reduced, preferably avoided , The continuous seal inner circumferential surface 23 serves in particular for the fact that

unwanted components, such as dust or oil, can flow away from the sealing element 16. This is especially during the washing process of the

Explosion protection valve 1 is advantageous in hygienic applications, in order to avoid that the undesired constituents remain on the sealing element 16. At the same time, this embodiment of the sealing element 16 ensures that the valve seat element 5 is separated from the valve seat opening VO by the sealing element 16. Thus, the valve seat element 5 no longer comes into contact with a working medium in the working space AR, which means that the valve seat element 5 can be made simpler with regard to the materials used.

The explosion protection valve 1 can be easily and securely arranged on a component via the exposed second end face DA2. It can be advantageous if the second end face DA2 in the direction of the valve axis VA from the axial end of the

Explosion protection valve 1, for example formed by the valve seat element 5, protrudes so that the sealing element 16 can be axially compressed when arranged on the component with the fastening means 11, which improves the seal on the second sealing surface DF2.

The explosion protection valve 1 can, for example, directly on a wall 3 of a

Work room AR are attached. But it can also be provided a mounting flange 20 which is attached to the wall 3 and on which

Explosion protection valve 1 is attached. For this purpose, the explosion protection valve 1 can also first be connected to the fastening flange 20 and then jointly on the wall 3. In the exemplary embodiment shown, the clamping screws 6a are screwed into a fastening flange 20, of course in the valve seat element 5

Corresponding recesses axially penetrating the valve seat element 5 are provided, preferably through-bores through which the clamping screws 6a protrude in order to be able to be screwed tightly to the fastening flange 20 (or also to the wall 3). The mounting flange 20 is only optional and offers the advantage, among other things, that a precisely defined sealing surface 21 serves as a support for the

Sealing element 16 can be provided, which improves the sealing properties of the explosion protection valve 1. The arrangement of a fastening flange 20 is particularly advantageous in the case of dirty or uneven surfaces of the wall 3. In addition, the recess in the mounting flange 20 can be more easily adapted exactly to the valve seat opening VO, so that as far as possible no joints or gaps form between the mounting flange 20 and the sealing element 16. The central one

Recess 20a in the mounting flange 20 can thus easily

Extend valve seat opening VO flush and seamless in the axial direction. If no fastening flange 20 is provided, the sealing element 16 with the free second sealing surface DF2 of the second end face DA2 rests directly on the wall 3 of the working space AR instead of on the fastening flange 20.

In the exemplary embodiment shown, the explosion protection valve 1 is essentially cylindrical with a round, preferably circular valve seat opening VO, the wall opening 4 of the wall 3 naturally also preferably having a round cross section. Accordingly, the valve plate 15, the valve seat element 5 and the fastening flange 20 are also essentially in the example shown

executed rotationally symmetrical about the valve axis VA. The sealing element 16 is consequently likewise designed as a rotationally symmetrical sealing ring. The holes for the clamping screws 6a and fastening screws 1 1a can of course be excluded from the rotational symmetry. The bores are arranged on a so-called bolt circle with a specific bolt circle diameter and are preferably spaced apart from one another on the bolt circle at constant angular intervals.

The sealing element 16 is preferably designed such that the sealing

inner peripheral surface 23 with the outer surface 22 of the recess 20a of the

Fastening flange 20, which can be conical or cylindrical, forms a continuous smooth, preferably joint-free peripheral boundary surface of the valve seat opening VO.

The valve seat element 5 can be made in one part or, as in the exemplary embodiment shown, in two parts. Due to the two-part design of the valve seat element 5, the valve seat element 5 can be produced very easily and inexpensively, since the two Valve seat components 5a, 5b are essentially structurally simple disc-shaped components. The valve seat components 5a, 5b can thereby be produced in a simple manner, for example by means of laser cutting from a plate of a suitable material, by continuous casting and subsequent sawing, etc. Of course, the valve seat element 5 could also be made in one piece, for example as a turned part.

In the example shown, the valve seat element 5 has two valve seat components 5a, 5b adjoining one another in the direction of the valve axis VA of the explosion protection valve 1. The first valve seat component 5a lies closer to the valve plate 15 in the axial direction than the second valve seat component 5b, as can be seen in FIG. 2b. The first

Valve seat component 5a has a first central valve seat component recess and the second valve seat component 5b has a second central one

Valve seat component recess. The first valve seat component recess is smaller than the second valve seat component recess, so in the case of the

shown cylindrical version of the explosion protection valve 1 has a smaller diameter relative to the second valve seat component recess. The two valve seat components 5a, 5b are thus essentially disc-shaped with the same outer diameter but different thickness and different inner diameters, which are arranged one above the other. This configuration forms a radially inwardly extending, for example essentially annular,

Valve element projection 24 from. Of course, such a valve element projection 24 projecting in the direction of the valve seat opening VO from the valve seat element 5 can also be designed in any other way, in particular also on a one-piece part

Valve seat element 5. The valve element projection 24 is preferably made closed over the circumference of the valve seat opening VO.

The sealing element 16 is advantageously arranged with its sealing outer peripheral surface 28 on the valve element projection 24. For this purpose, the sealing element 16 has a corresponding sealing element recess 25 on the sealing outer circumferential surface 28, with which the sealing element 16 can be arranged on the valve element projection 24.

Another advantage of the explosion protection valve 1 according to the invention is the complete shielding of the valve seat element 5 from the working medium of the explosion protection valve 1. As a result, the valve seat element 5, or the two valve seat components 5a, 5b of the valve seat element 5, can be produced from any suitable material and a machinable material does not necessarily have to be used, as is known in the prior art for mechanical processing of the sealing groove 17 for the O. -Ring is required. In particular when handling corrosive working media in the working area AR, the shielding of the valve seat element 5 from the working medium offers a clear advantage compared to conventional valves. By avoiding the contact of the

Valve seat element 5 with the aggressive, corrosive atmosphere in the working space AR, it is not necessary, as previously, that a corrosion-resistant material is used to manufacture the valve seat element 5, but simple steel such as e.g. Mild steel (S 235 JR) can be used, which leads to significant cost savings, especially for large versions of the explosion protection valve 1. Other suitable materials would also be conceivable, such as Plastics or non-ferrous metals.

As already mentioned, a flame absorber 10 is preferably also on

Explosion protection valve 1 is provided, which is used in the event that

Flame development due to an explosion, no flames from the

Exit explosion protection valve 1 into the surrounding area AT. This serves

in particular as a safety measure for people who may be in the area or for fire protection if there are flammable materials, gases or other substances in the area AT outside of the explosion protection valve 1. Such flame barriers 10 are known in the prior art, which is why they are not discussed in more detail here.

In Fig.4a and Fig.4b are two exemplary embodiments of the

Sealing element 16 shown in cross section. The specific structural design of the sealing element 16 is of course left to the person skilled in the art and can vary depending on the application of the explosion protection valve 1, e.g. depending on the temperature in the working area AR, depending on the working medium or depending on the pressure in the working area AR, etc. The sealing element 16 could have one or more circumferential sealing lips on the first end face DA1 facing the valve plate 15 and / or on the second end face DA2 facing away from the valve plate 15 (see FIGS. 4a + 4b). In Fig. 4a a first advantageous embodiment of the sealing element 16 is shown in cross section and in Fig.4b a second advantageous embodiment. The sealing element 16 can be essentially made of any suitable material, wherein

preferably common elastic materials are used. For example, plastics, synthetic rubber, natural rubber or mixtures thereof with other materials would be conceivable. Sealing materials are known in the prior art and the person skilled in the art can select a suitable material for a specific one

Select application. In particular for hygiene applications such as in the food or pharmaceutical industry, care must be taken to ensure that a suitable sealing material is used.

The sealing element 16 in FIG. 4 a has a sealing element recess 25 on the sealing outer circumferential surface 28, the lower recess surface 25 a of which is essentially parallel to the second sealing surface DF2 of the second end face DA2. The Opposing upper recess surface 25b of the sealing element recess 25 is inclined at a certain pretension angle a to the first recess surface 25a, so that (in the non-installed state of the sealing element 16) there is a certain minimum distance a between the two recess surfaces 25a, 25b. This minimum distance a is preferably set such that it is less than the axial projection extension b of the valve seat element projection 24 (see FIG. 2b). Due to the preferably elastic material of the sealing element 16, a certain pretensioning force can be generated with which the second recess surface 25b (in the installed state of the

Sealing element 16) is pressed onto the valve seat element projection 24. As a result, the sealing element 16 can be seated essentially without play

Valve seat element projection 24 can be ensured, the upper recess surface 25b preferably being flat on the installed element of the sealing element 16

Valve seat element projection 24 rests and is therefore parallel to the lower recess surface 25a.

A first and a second main sealing lip 27a, 27b are provided on the first (upper) end face DA1 of the sealing element 16, the first main sealing lip 27a being formed by the seal inner circumferential surface 23 and the first sealing surface DF1 and the second main sealing lip 27b by the first sealing surface DF1 and the seal outer peripheral surface 28 is formed. The main sealing lips 27a, 27b each have a round end with a certain radius R. The main sealing lips 27a, 27b cooperate sealingly with the valve plate 15 in the installed state of the sealing element 16, as can be seen in FIG. 2b. The exact number i of main sealing lips 27i and the exact structural design depend on the application of the explosion protection valve 1, e.g. according to the expected maximum or minimum temperature in the work area AR, an expected pressure in the work area, the working medium or e.g. even after a required service life of the sealing element 16. For example, the first main sealing lip 27a, which in the closed state of the explosion protection valve 1 (which is the normal case) lies against the valve plate inner surface 15a, could be long, narrow and designed with a small radius R in order to be as good as possible at the

To nestle the valve plate inner surface 15a in order to minimize the risk that deposits form in the area between the valve plate 15 and the first main sealing lip 27a. The main sealing lips 27a, 27b could also be dispensed with, in which case the first sealing surface DF1 would be essentially analogous to the second sealing surface in FIG. However, e.g. only a first (or second) main sealing lip 27a (or 27b) can be provided on the sealing element 16.

For example, when the sealing element 16 is not installed, the inner circumferential surface 23 of the seal could already have a curvature, as shown in FIG Dashed line is symbolized to nestle even better against the valve plate inner surface 15a in the installed state. In the installed state of the

Sealing element 16 and when the explosion protection valve 1 is closed, the first main sealing lip 27a is preferably elastically deformed in order to exert a certain pretensioning force on the valve plate 15, as a result of which the sealing effect is improved. The curvature of the inner circumferential sealing surface 23 in FIG. 2b shows that the entire

Sealing element 16 is subject to a certain deformation in the closed state of the explosion protection valve 1. This deformation can in turn depend on many parameters and influencing factors, e.g. the spring force with which the valve plate 15 presses on the sealing element 16, the sealing material, the temperature in the working space AR, etc.

In the example shown in FIG. 4 a, the sealing element 16 has a substantially straight inner circumferential surface 23 with a sealing inclination β between the inner circumferential surface 23 and the second sealing surface DF2 of the second end face DA2. This sealing tendency β can also be variable over the length of the inner circumferential surface 23 of the seal, e.g. when the seal inner peripheral surface 23 is curved (dashed line in Fig.4a). On the (upper) first end face DA1, two additional sealing lips 29 are additionally arranged between the two main sealing lips 27a, 27b, which, when the explosion protection valve 1 is closed, on the

Fit valve plate inner surface 15a and improve the seal. At the ends of the secondary sealing lips 29 and also at the edges, curves with a certain radius R can also be provided. Due to the manufacturing process, there can usually be a certain minimum radius of the curves. Again, more or less or no secondary sealing lips 29 can be provided, depending on the application and the required sealing effect.

In contrast to the embodiment according to FIG. 4a, the embodiment according to FIG. 4b also has secondary sealing lips 29 on the (lower) second end face DA2 in order to improve the sealing effect on the fastening flange 20 (or on the wall 3). In addition, a projection 30 is provided between the second main sealing lip 27b and the sealing element recess 25, as a result of which the recess area 25b is enlarged and offers a better contact of the sealing element 16 on the valve seat element projection 24.

The configuration of the sealing element 16 according to FIG. 4 a is preferably for

Valve seat openings VO with diameters <500mm are used and the configuration of the sealing element 16 according to FIG. 4b is preferably used for valve seat openings VO with diameters> 500mm. The illustrated variants of the sealing element 16 are of course only to be understood as examples. It can be seen that it is for the constructive design of the

Sealing element 16 has a very large scope for the person skilled in the art and that, depending on the specific application of the explosion protection valve 1, there are also various configurations of sealing elements 16 in order to achieve the required sealing effect. Of course, it would also be possible to arrange only a first or second main sealing lip 27a, 27b, to arrange a plurality i of secondary sealing lips 29i, or to provide different preloads, curvatures and angles.

Even if the explosion protection valve 1 according to the invention was described on the basis of the advantageous cylindrical design, it should be noted at this point that other designs are also possible. For example, An explosion protection valve 1 could also be provided for a wall recess 4 deviating from the cylindrical shape, for example for a triangular, rectangular or oval wall recess 4. The structural design can then be adapted to the shape of the wall recess 4. The essence of the invention, that is, the configuration of the sealing element 16 for peripheral

Limitation of the valve seat opening VO and for shielding the valve seat element 5 from the valve seat opening VO remains the same.

Claims

claims

1. Explosion protection valve (1) for arrangement at a wall opening (4) of a wall (3) of a work space (AR) to relieve the work space (AR) when a predetermined opening pressure is exceeded when an inflammable medium in the work space (AR) explodes with a valve seat element ( 5), with a valve seat opening (VO) and with a

Valve plate (15), the valve plate (15) the valve seat opening (VO) in one

closed state of the explosion protection valve (1) closes, and one,

Valve seat element (5) between the valve seat element (5) and the valve plate (15) arranged one-piece sealing element (16), which is in contact with the valve plate (15) when the explosion protection valve (1) is closed, the valve plate (15) being exceeded the predetermined opening pressure to release the valve seat opening (VO) can be lifted off from the sealing element (16), characterized in that on

Sealing element (16), a first end face (DA1) forming a first sealing surface (DF1) and an opposite second end face (DA2) forming a second sealing surface (DF2) are provided, the valve plate (15) being in the closed state of the explosion protection valve (1) ) bears sealingly on the first end face (DA1) and the second end face (DA2) is at least partially free, in order to seal directly on the wall (3) or on one of the walls in the assembled state of the explosion protection valve (1)

Fastening flange (20) to provide that on the sealing element (16) an internal, continuous sealing inner peripheral surface (23) is provided, which connects the first end face (DA1) and the second end face (DA2) and that the sealing element (16) with a , the seal inner circumferential surface (23) opposite outer seal outer circumferential surface (28), which connects the first end face (DA1) and the second end face (DA2), is arranged on the valve seat element (5), and that the seal inner circumferential surface (23 ) limits the valve seat opening (VO) peripherally.

2. Explosion protection valve (1) according to claim 1, characterized in that the explosion protection valve (1) is a fastening means (11) for fastening the

Explosion protection valve (1) on the wall (3) of the work space (AR), wherein a plurality of fastening screws (1 1 a) is preferably provided as the fastening means (11) with which the explosion protection valve (1) on the wall (3) of the

Working area (AR) can be screwed tight.

3. Explosion protection valve (1) according to claim 1 or 2, characterized in that in the explosion protection valve (1) a flame absorber (10) to avoid a

Flame spread from the work area (AR) through the explosion protection valve (1) is provided on the outside, the flame absorber (10) preferably being designed in the form of a plate pack consisting of a plurality of sheet metal plates arranged one above the other.

4. Explosion protection valve (1) according to one of claims 1 to 3, characterized

characterized in that the explosion protection valve (1) has a suspension unit (13) which is provided to the valve plate (15) in the closed state of the

Biasing the explosion protection valve (1) with a biasing force against the sealing element (16), the suspension unit (13) preferably being designed as a coil spring (14) with a preferably linear, progressive or degressive spring characteristic.

5. Explosion protection valve (1) according to one of claims 1 to 4, characterized

characterized that a circular valve seat opening (VO) and one with it

Corresponding circular valve plate (15) are provided, the

Sealing element (16) is designed as a rotationally symmetrical sealing ring.

6. Explosion protection valve (1) according to one of claims 1 to 5, characterized

characterized in that the first end face (DA1) and the seal inner circumferential surface (23) form a first main sealing lip (27a) which, in the closed state of the

Explosion protection valve (1) is in contact with the valve plate (15).

7. explosion protection valve (1) according to any one of claims 1 to 6, characterized

characterized in that the first end face (DA1) and the seal outer circumferential surface (28) form a second main sealing lip (27b) which, in the closed state of the

Explosion protection valve (1) is in contact with the valve plate (15).

8. Explosion protection valve (1) according to claim 7, characterized in that on the first end face (DA1) of the sealing element (16) at least one secondary sealing lip (29) is provided, which lies between the first and second main sealing lip (27a, 27b) and / or that at least one secondary sealing lip (29) is provided on the second end face (DA2) of the sealing element (16) and lies between the outer sealing surface (28) and the inner sealing surface (23).

9. Explosion protection valve (1) according to one of claims 1 to 8, characterized

characterized in that a valve seat element projection (24) extending inward in the direction of the valve seat opening (VO) is provided on the valve seat element (5) and that a sealing element recess (25) for arranging the sealing element (16) on the valve seat element projection is provided on the outer circumferential surface of the seal (28) (24) is provided.

10. The explosion protection valve (1) according to claim 9, characterized in that the valve seat element (5) has a first disk-shaped valve seat component (5a) with a first central valve seat component recess and a second disk-shaped valve seat component (5b) adjoining it in the closing movement direction of the valve plate (15). with a second central valve seat component recess, the first valve seat component recess for forming the valve seat element projection (24) being smaller relative to the second valve seat component recess.