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A reliable low-wear ventilating valve for mounting on a sewer pipe, to prevent the development of a negative pressure and also to prevent the escaping of unpleasant odors. The ventilating valve includes a tubular body, one end of which is configured as a fastening piece for mounting on a sewer pipe

A reliable low-wear ventilating valve for mounting on a sewer pipe, to prevent the development of a negative pressure and also to prevent the escaping of unpleasant odors. The ventilating valve includes a tubular body, one end of which is configured as a fastening piece for mounting on a sewer pipe and the other end of which is configured as a ventilating valve head which has inlet openings for the inlet air into the sewer pipe, which are located between concentric rings which are arranged at a distance from the tubular body and extending symmetrically about the latter on ribs of the tubular body.

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1. A ventilating valve comprising a tubular body (1) having an inside, a bottom end and a top end, the bottom end configured as a fastening piece (2) for mounting on a sewer pipe and the top end configured as a ventilating valve head (3), wherein the ventilating valve head comprises:ribs (6) extendi

1. A ventilating valve comprising a tubular body (1) having an inside, a bottom end and a top end, the bottom end configured as a fastening piece (2) for mounting on a sewer pipe and the top end configured as a ventilating valve head (3), wherein the ventilating valve head comprises:ribs (6) extending upwards from the fastening piece (2),concentric rings (5.1-5.4) arranged spaced apart and one above the other on the ribs (6), wherein inlet openings (4) for the inlet of air into the sewer pipe are defined between the ribs (6) and the concentric rings (5.1-5.4), the concentric rings including an upper concentric ring (5.4),an essentially flat disk-shaped annular membrane (9) having a radially inner edge, a radially outer edge, a bottom side (9.1) and a top side (9.2),a radially inner circumferential valve seat ring (7) for the annular membrane (9),a radially outer circumferential valve seat ring (8) for the annular membrane (9), wherein said radially inner and radially outer circumferential valve seat rings (7, 8) define between them a vent opening through which the tubular body inside communicates with the ambient environment, wherein the annular membrane (9) is flat on the bottom side (9.1) and tapers on the top side, in each case, from the edges towards the center of the ring,a lid (10) arranged in a sealing manner on the upper concentric ring (5.4),a sieve (11) connected to the radially inner circumferential valve seat ring (8) andguide pins (12) connected to said sieve (11) and projecting above the radially inner circumferential valve seat ring (7),wherein said ventilating valve head is configured such that:(a) when a pressure in the inside of the tubular body is equal to atmospheric pressure, the disk-shaped annular membrane (9) rests on the radially inner and radially outer circumferential valve seat rings (7, 8) sealing the vent opening defined between the radially inner and radially outer circumferential valve seat rings (7, 8), and(b) when a pressure in the inside of the tubular body is below atmospheric pressure, the disk-shaped annular membrane (9) is raised by the atmospheric pressure, the radially inner edge of the disk-shaped annular membrane (9) guided by contact with said guide pins (12), to allow communication between the outside atmosphere and the inside of the tubular body (1). 2. The ventilating valve according to claim 1, wherein the sieve (11) fills up a cross section of the tubular body (1) in the ventilating valve head (3). 3. The ventilating valve according to claim 2, wherein the guide pins (12) are dimensioned such that they contact the lid (10). 4. The ventilating valve according to any claim 1, wherein the tapering (9.2) of the annular membrane (9) is effected linearly in each case. 5. The ventilating valve according to claim 1, wherein the tapering (9.2) of the annular membrane (9) is effected symmetrically to the center of the ring. 6. The ventilating valve according to claim 1, wherein the radially inner and radially outer edges of the annular membrane (9) are rounded. 7. The ventilating valve according to claim 1, wherein the lid (10) is provided externally with an insulating protective cover (14) made of a foamed thermoplastic. 8. The ventilating valve according to claim 7, wherein the protective cover (14) is part of the shipping packaging for the ventilating valve. 9. The ventilating valve according to claim 1, wherein the lid (10) is provided externally with an insulating protective cover (14) made of polystyrene. 10. A ventilating valve comprising a tubular body (1) having an inside, a bottom end and a top end, the bottom end configured as a fastening piece (2) for mounting on a sewer pipe and the top end configured as a ventilating valve head (3), wherein the ventilating valve head comprises:ribs (6) extending upwards from the fastening piece (2),concentric rings (5.1-5.4) arranged spaced apart and one above the other on the ribs (6), wherein inlet openings (4) for the inlet of air into the sewer pipe are defined between the ribs (6) and the concentric rings (5.1-5.4), the concentric rings including an upper concentric ring (5.4),a disk-shaped annular membrane (9) having a radially inner edge, a radially outer edge, a bottom side (9.1) and a top side (9.2),a radially inner circumferential valve seat ring (7) for the annular membrane (9),a radially outer circumferential valve seat ring (8) for the annular membrane (9), wherein said radially inner and radially outer circumferential valve seat rings (7, 8) define between them a vent opening through which the tubular body inside communicates with the ambient environment, wherein the annular membrane (9) is flat on the bottom side (9.1) and tapers on the top side, in each case, from the edges towards the center of the ring,a lid (10) arranged in a sealing manner wherein the guide pins are dimensioned such that they contact an inside of the lid on the upper concentric ring (5.4),a sieve (11) connected to the radially inner circumferential valve seat ring (8) andguide pins (12) connected to said sieve (11) and projecting above the radially inner circumferential valve seat ring (7),wherein said ventilating valve head is configured such that:(a) when a pressure in the inside of the tubular body is equal to atmospheric pressure, the disk-shaped annular membrane (9) rests on the radially inner and radially outer circumferential valve seat rings (7, 8) sealing the vent opening defined between the radially inner and radially outer circumferential valve seat rings (7, 8), and(b) when a pressure in the inside of the tubular body is below atmospheric pressure, the disk-shaped annular membrane (9) is raised by the atmospheric pressure, the radially inner edge of the disk-shaped annular membrane (9) guided by contact with said guide pins (12), to allow communication between the outside atmosphere and the inside of the tubular body (1).