MXPA98010416A - Safety valve of synthetic material to receive - Google Patents

Abstract

The present invention relates to a plastic safety valve for a container for the transport and storage of liquids, the valve is an aeration valve and automatic ventilation integrated in a cover or cap that seals an opening for filling and / or emptying or a container vent or vent opening, the safety valve comprises a valve housing consisting of a screw cap and configured to be threaded into a threaded hole for coupling the cover or plug, the valve housing comprising a central hub supported by ribs, the hub has a through hole, the ribs extend outward in a star-shaped configuration from the hub to a ring-shaped rim, holes are formed for air between the ribs, and an elastic valve membrane of an aeration unit to open and close the air holes is pushed from inside the cube to a bucket flange; the valve membrane has a hat-shaped profile and is installed in the valve housing with a hat opening facing the ring-shaped flange of the valve housing, where when the aeration unit is in a closed position a ring-shaped edge of the membrane rests under prestress against an inner surface of the ring-shaped rim of the valve housing forming a valve seat; a ventilation unit is inserted into an outer end of the orifice in the hub, wherein the vent unit has a valve plate of resilient material having a bottom side that rests against an outer edge bevelled inwardly of the hub forming a valve seat; the ventilation unit is supported in the through hole of the bucket, a cover against swell is pressed on an inner end of the bucket, where an outer edge of the cover against swell form j with an inner end of the valve housing a circumferential groove for the air entering the container when the aeration unit is open or for air or gas to escape from the container when the ventilation unit is open; simultaneously to retain the valve membrane to the hub, a counter wave with at least one through hole for air or gas is inserted into the valve housing between the valve membrane and the anti-surge cap and extends coaxially towards the membrane and the anti-surge cap, where the anti-surge disk forms a labyrinth as a protection for the valve membrane against variations of liquid entering the valve housing together with the anti-surge cap, retaining segments for a sealing cover configured to be firmly attached to the housing formed on the outer edge of the valve housing, where openings to the air inlet to the container through the aeration unit when the valve membrane is open and to the air or gas escaping from the container through the ventilation unit when the valve plate is open, are formed between the segments of the valve. retention and the sealing cap projecting outward beyond the retaining segments

Description

SYNTHETIC MATERIAL SAFETY VALVE FOR CONTAINERS Description of the invention This invention relates to a plastic safety valve for containers, especially floor containers with an inner container of synthetic material and an outer metal jacket, for transport and storage of liquids, which is configured as an automatic ventilation valve for the air inlet and / or outlet, and which is integrated in a cover or in a cap to close the filling and / or emptying opening or the ventilation opening for the entrance and / or the air outlet of a container. German patent document DE 25 01 228 A1 discloses a closure cap intended for liquid containers which can be screwed onto the neck of a tap, in which a safety valve of the type under consideration which responds to positive pressure is integrated. and the negative pressure in the container. In this safety valve, a valve disc made of elastic material is used which, when inserted, is strongly prestressed and, as a result, adopts the shape of a spherical segment. With this valve there is a danger of leakage due to fatigue phenomena of the valve disc material in the case of longer use.

The object of the invention is the task of developing a safety valve of the type under consideration that meets the highest safety requirements. This task is solved according to the invention by means of a safety valve with the features of claim 1. The dependent claims contain advantageous improvements of the invention. The safety valve according to the invention is characterized by the highest safety of operation and satisfies the prescribed safety guidelines. In parquet containers whose flexible inner container made of synthetic material with a nominal volume of, for example, 1250 liters is equipped with the safety valve, an adjustable overpressure can be created in the inner container by means of the air evacuation unit of the valve. of safety, which stabilizes the inner container and prevents a "breathing" of the inner container during transport that is coupled with the striking of the walls of the container against the outer metallic lattice jacket or against the outer metallic foil jacket, so as to avoids the risk of a leak in the inner container during transport.

The invention is explained below on the basis of the drawings, which represent the following: Fig. 1 a longitudinal section of a safety valve configured as an automatic ventilation valve for the air inlet and / or outlet in an amplified representation and, Fig. 2 a plan view of the valve according to Fig. 1, without sealing cap. The safety valve 1 made of synthetic material according to Figs. 1 and 2 for tanks, barrels, floor containers and similar containers for transportation and storage of liquids is constituted by an inlet ventilation unit 2 and an outlet ventilation unit 3 which are integrated in a valve body 4 configured as a screw cap. The body 4 of the valve, which is screwed into a threaded cover 5 of synthetic material for, for example, closing the filling opening of the plastic inner container of a parquet container, and which in the threaded cover 5 is leakproof passing liquids by means of a sealing ring 6, has a central hub 7 which is supported by ribs 8 that from the hub 7 extend outwards in a star shape to an annular shoulder 9. Between the support ribs 8, air passage openings 10 are formed. A valve membrane 11 of the inlet ventilation unit 2, of an elastic configuration for opening and closing the air passage openings 10, which is made of a flexible and resistant material against aggressive liquids, such as a synthetic material or rubber with the corresponding additives, is configured as hat profile 12, and has a reinforced central fixing hub 13. The membrane 11 of the valve is pushed on the hub 7 of the valve body to a step 15 thereof, with the opening 14 of the hat profile pointing towards the annular shoulder 9 of the valve body 4. The valve diaphragm 11 is retained on the hub by means of a swage cover 17 which is mounted under pressure on the inner end 16 of the hub 7. In the cover 17 against swelling waves, a retaining sleeve 18 with retention ribs 19 is formed axial, which tightens the membrane 11 of the valve with the fixing hub 13 against the step 15 of the hub 7 of the valve body 4, such that in the closed position of the inlet ventilation unit 2, the membrane 11 of the valve rests with an annular edge 20 under prestressing against the inner side 21 of the annular shoulder 19 of the valve body 4 forming a valve seat. The membrane 11 of the valve is additionally retained against an annular projection 23 formed on the inner edge 22 of the annular shoulder 9. The support ribs 8 of the hub 7 have a profile 29 which adapts to the hat profile 12 of the membrane 11 of the valve, in order to stop the valve membrane in the event of an overpressure in the container. The outer edge 30 of the surf cover 17 forms with the inner end 31 of the valve body 4 a peripheral passage slit 32 for the air entering the container with the inlet ventilation unit 2 open and, for the air or gas that leaves the container with the evacuation ventilation unit 3 open. Between the diaphragm 11 of the valve and the anti-surge cover 17, a swirl disk 33 with a hat profile 34 having a central passage opening for air or gas is inserted coaxially with respect to the membrane and to the cover. The swell disk 33 forms a labyrinth which protects the membrane 11 of the valve against the liquid that penetrates the safety valve 1 due to swelling. The anti-surge disk 33 which is mounted on the valve body 4 with the opening 36 of the hat profile pointing towards the membrane 11 of the valve forms a draining surface 37 for the liquid which, by swelling, penetrates the valve 1. Likewise, the bulge 33 of the cover 17 against the swell pointing towards the membrane 11 of the valve forms a draining surface 38 for the liquid that penetrates the safety valve 1 by swelling. On the external side 39 of the anti-surge cap 17, axial clamping projections 40 are formed to press the disk 33 against waves against a step 41 on the inner side 42 of the valve body 4. The evacuation ventilation unit 3 inserted in the outer end 43 of the piercing bore 44 of the hub 7 of the valve body 4 is equipped with a valve plate 45 of resilient material resting with its lower side on an outer edge 46 of the hub 7 tilted inwards, which forms a valve seat. On the valve plate 45 is formed in one piece a fastening bolt 47 with a head 48 which, for fixing the valve plate 45 which is supported with slight pretension on the edge 46 of the hub 7, is embedded with an undercut 49 of the through hole 44 of the hub 7, where axial channels 50 or 51 of air passage or gas that are confused with one another are arranged on the periphery of the fixing bolt 47 and its head 48. On the outer side 52 of the annular shoulder 9 of the valve body 4 is welded a grid 53 made of synthetic material which covers the air passage openings 10 between the support ribs 8 of the hub 7 as protection against the entry of insects. At the outer edge 54 of the body 4 of the valve abutting the annular shoulder 9, hook-shaped retention teeth 55 are formed for a sealing cap 56 which is clamped thereon., between which the retaining teeth 55 and the sealing cap 56 projecting outwardly thereon are formed openings 57 for passage of air flowing into a container with the inlet ventilation unit 2 of the valve 1 being open. safety and, for the air flowing out of the container, or the gas flowing out of the container, the evacuation ventilation unit 3 being open. On the inner side 58 of the sealing cap 56, an annular rib 60 with an undercut 61 is formed at a radial distance from its outer edge 59, which engages with the retaining teeth 5 of the valve body 4 when the valve is clamped. lid 56 sealer on top of that. Four segments 62 profiled on the outer side 52 of the annular shoulder 9 serve to be able to insert a cross spanner when screwing or unscrewing the safety valve 1, to insert or remove it from the threaded cover 5. If a negative pressure is present in a plastic inner container equipped with the safety valve 1 of a floor container when removing liquid, the membrane 11 of the inlet ventilation unit 2 is opened, so that the air can flow into the container through the air passage openings 55, 10, 35 and 32 of the safety valve in the direction of the arrow drawn in Fig. 1. The stiffness of the valve plate 45 of unit 3 The evacuation ventilation of the safety valve 1 is dimensioned in such a way that an overpressure of, for example, 80 millibars can be formed in the inner container of the parquet container, by means of which the container is stabilized. When the above-mentioned overpressure limit value is exceeded in the container, the valve plate 45 of the evacuation ventilation unit 3 of the safety valve 1 is opened, so that the air or gas which is under overpressure can be released. (n) flowing out of the container through the air passage openings or through the flow channels 32, 35, 24, 28, 26, 44, 51, 50, 10 and 57 of the safety valve 1 in the direction b of the arrow.

Claims (14)

1. Plastic safety valve for containers, for transport and for the storage of liquids, which is configured as an automatic ventilation valve for the air inlet and / or outlet, and which is integrated in a lid or in a stopper for closing the filling and / or emptying opening or the ventilation opening for the inlet and / or the air outlet of a container, characterized by the fact that the valve body configured as a screw cap that can be screwed into a The corresponding threaded hole of the threaded cap or of the threaded plug has a central hub with a through hole supported by ribs, the ribs extending outward in a star-shaped fashion from the hub to form an annular shoulder, and between the ribs of support are formed openings of. air passage, by the fact that in addition a membrane of the valve of elastic configuration of an inlet ventilation unit to open and close the openings of air passage between the ribs, is pushed from the inside on the hub to a step of the same, the membrane of the valve configured as hat profile being interconstructed in the body of the valve with the opening of the hat profile pointing towards the annular shoulder of the valve body and, in the closed position of the valve. the inlet ventilation unit rests with an annular edge under pretension against the inner side of the annular shoulder of the valve body forming a valve seat, by the fact that at the outer end of the pansant bore of the hub it is inserted an evacuation ventilation unit that has a valve plate made of elastic material that with its lower side rests on the chamfered outer edge or inside the hub that forms a valve seat and, which is retained in the through hole of the hub, by the fact that on the inner end of the hub is mounted a pressure against swell whose outer edge forms with the inner end from the valve body a peripheral passage gap for the air entering the container with the inlet ventilation unit open and, for the air or gas leaving the container, the evacuation ventilation unit being open and simultaneously serving for fix the valve membrane on the hub, due to the fact that between the valve membrane and the anti-surge cap is inserted into the valve body, coaxially with respect to the membrane and the cover, a counter against swell with at least one passage opening for air or gas, which forms together with the anti-surge cap a labyrinth that protects the valve membrane against liquid The wave penetrates the valve, and due to the fact that at the outer edge of the valve body that abuts the annular shoulder are formed retaining segments (retention teeth) for a sealing cap that can be trapped on the valve body, being between the retaining segments (retention teeth) and the sealing cap that protrudes outwardly thereon are formed passage openings for the air flowing into the container through the ventilation unit of the valve. inlet with the valve membrane open and, for air or gas flowing out of the container through the exhaust ventilation unit with the valve plate open.

2. Safety valve according to claim 1, characterized in that the support ribs of the hub have a profile that adapts to the hat profile of the valve membrane, to stop the membrane of the valve during an overpressure in the container and that the valve membrane is additionally stopped by an annular projection formed on the inner edge of the annular shoulder of the valve body.

3. Safety valve according to claim 1 or 2, characterized in that the valve membrane made of a flexible material and resistant against aggressive liquids, such as a synthetic material or rubber with the corresponding additives, has a Central fixation hub, reinforced. Safety valve according to one of Claims 1 to 3, characterized in that a clamping sleeve with axial clamping ribs is formed in the bulge against the bulge, which tightens the membrane of the clamp. valve with the clamping hub against the step of the hub of the valve body and, because of the fact that between the retaining sleeve of the anti-surge cap and the hub of the valve body are arranged flow channels that are communicated with passage slots in the inner end of the cap retaining the cap against swell and, with passage slots in the inner end of the hub of the valve body, for the air that is under overpressure flowing out and / or the gas flowing out of a container through the evacuation ventilation unit. Safety valve according to one of the claims 1 to 4, characterized in that the bulging of the cover against swell pointing towards the membrane of the valve forms a surface of runoff for the liquid that by swell penetrates the safety valve. Safety valve according to one of claims 1 to 5 / characterized by the fact that the wave counter has a hat profile with a central passage opening for air or gas. Safety valve according to one of the claims ß, characterized by the fact that on the outer side of the anti-surge cap, distributed around the periphery of the lid, there are formed axial clamping projections for tightening the disk against waves against a step on the inner side of the valve body. 8. Safety valve according to one of claims 1 to 7, characterized in that the anti-surge disk is mounted on the valve body with the opening of the hat profile pointing towards the membrane of the valve. valve, and forms a runoff surface for the liquid that penetrates the valve through waves. Safety valve according to one of claims 1 to 8, characterized in that an automatic overpressure regulation in the container is achieved by means of an evacuation ventilation unit. Safety valve according to claim 9, characterized in that the overpressure is regulated in the container by the evacuation ventilation unit at 50 to 120 millibars, preferably at 80 millibars. Safety valve according to one of claims 1 to 10, characterized in that a fixing bolt with a head is integrally formed on the valve plate of the exhaust ventilation unit. which, to fix the valve plate that rests with slight pretension on the outer edge of the hub of the valve body, is embedded with an undercut of the through hole of the hub, being that on the periphery of the fixing bolt and from its head are axial channels of air passage or gas that are confused with each other. Safety valve according to one of claims 1 to 11, characterized in that a grid, preferably made of synthetic material, placed on the outer side of the annular shoulder of the valve body, covers the openings of the valve. passage of air between the support ribs of the bucket, as protection against the entry of insects. 13. Safety valve according to claim 12, which is characterized by the fact that the grid is welded to the outer side of the annular shoulder. Safety valve according to one of Claims 13, characterized in that retaining teeth in the form of a hook are formed on the outer edge of the valve body to trap the sealing cap on the side of which Inside, an annular rib is formed with an undercut at a radial distance from the outer edge, which engages with the retention teeth of the valve body when the sealing cap is pinned thereon.