Abstract: The closing and sealing device for use in air admittance valves includes a valve housing (10) designed to be connected to the waste water pipe system, an upper cap (14) and a valve closing and sealing device which includes a fixed valve seat (22) and a movable closing member (24). The housing (10) includes at least one passageway (16) in communication with the surrounding atmospheric air, and at least one passageway (18) in connection with the inner space (19) of the sewage system, each of the passageways being in contact with the movable closing member (24).

Abstract: The valve is designed to be connected to a sanitary waste pipe system for admitting atomospheric air into the waste pipe towards the valve function elements in response to a pressure reduction in the system in order to protect the water traps in the system and to prevent discharge of contaminated air from the system to the atmosphere. It includes an oblong bowl-shaped valve housing (10), a vertical tubular member (12) extending downwards from the housing (10) and adapted to be connected to the waste pipe system, an inner space (18) within the valve housing (10) and containing the valve function elements (34), at least one passage (26) from the valve function elements (22) towards the surrounding atmosphere and a cover member (14) overlying the inner space and having a top wall spaced above the valve function elements (20, 22, 34).

Abstract: The closing and sealing device for use in air admittance valves includes a valve housing (10) designed to be connected to the waste water pipe system, an upper cap (14) and a valve closing and sealing device which includes a fixed valve seat (22) and a movable closing member (24). The housing (10) includes at least one passageway (16) in communication with the surrounding atmospheric air, and at least one passageway (18) in connection with the inner space (19) of the sewage system, each of the passageways being in contact with the movable closing member (24).

Abstract: A water trap for sanitary appliances of the kind having an inlet (5) and an outlet (12) and including a housing (1) with an upper portion (4) provided with the inlet opening (5) adapted to receive the outlet pipe (6) of the sanitary appliance, a central portion (3) adapted to be connected to the upper portion (4), provided with a cylindrical passing through space (10), the outlet opening (12) connected to an evacuation pipe (13) situated in a lower extension of the central portion (3) and a valve housing (11), situated in the upper part, incorporating an air admittance valve (8) located above the outlet opening (12) and leaving between its lower part and the upper surface of the outlet opening (12) an air admittance area (17); a lower portion (2) connected to the central portion (3) and in which the main part of the water trap or seal is formed by use of a separation wall (20) extending from the central portion (3) into the lower portion (2).

Abstract: A water trap for sanitary appliances of the kind having an inlet (5) and an outlet (12) and including a housing (1) with an upper portion (4) provided with the inlet opening (5) adapted to receive the outlet pipe (6) of the sanitary appliance, a central portion (3) adapted to be connected to the upper portion (4), provided with a cylindrical passing through space (10), the outlet opening (12) connected to an evacuation pipe (13) situated in a lower extension of the central portion (3) and a valve housing (11), situated in the upper part, incorporating an air admittance valve (8) located above the outlet opening (12) and leaving between its lower part and the upper surface of the outlet opening (12) an air admittance area (17); a lower portion (2) connected to the central portion (3) and in which the main part of the water trap or seal is formed by use of a separation wall (20) extending from the central portion (3) into the lower portion (2).

Abstract: The invention relates to a valve for admitting atmospheric air into the waste pipe system in response to pressure reduction in the system for protecting the water traps in the system and to prevent atmospheric discharge of contaminated air from the waste pipe system. The valve consists of a valve body having at least two air inlet openings in communication with the atmospheric air, each of the openings alternating with a passage towards the waste pipe system, the openings and passages being equally distributed within the valve housing viewed in horizontal cross-section about the valve seat level. The valve member resting, in a normal closed position, on the valve seat separating the openings from the passages and having a substantially butterfly shaped sealing surface for a valve embodiment having two diametrically opposed openings situated perpendicular respectively to two diametrically opposed passages.