# US 2017/0282884 A1 · Drain valve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0282884 A1 - Document ID: US20170282884A1 - Status: Published application - Kind: A1 - Application number: 15/509,270 - Filed: 2014-09-10 - Published: 2017-10-05 - Earliest claimed: 2014-09-10 - Assignees: Kongsberg Automotive AB - Applicants: Kongsberg Automotive AS - Inventors: Kjell Villanger; Sture Sörli; Henning Rud - Web page: https://patentgrep.com/patent/US20170282884A1 ## CPC - B60T 17/004: {Draining and drying devices} - B60T 15/36: Other control devices or valves characterised by definite functions {(electrically controlled valves in fluid-pressure brake systems B60T15/027, B60T15/028)} - F16K 1/36: Valve members (for double-seat valves F16K1/44 {; for butterfly valves F16K1/222, F16K1/223}) - F16K 27/02: of lift valves (for reducing the flow resistance of screw-spindle lift-valves F16K1/06) - B29C 45/1676: {using a soft material and a rigid material, e.g. making articles with a sealing part} - B29K 2077/00: Use of {PA, i.e.} polyamides, e.g. polyesteramides {or derivatives thereof}, as moulding material - B29K 2309/08: Glass - B29K 2995/007: Hardness - B29L 2031/7506: {Valves} - F16K 15/026: {the valve member being a movable body around which the medium flows when the valve is open} - F16K 31/60: Handles {(form, features or function of taps or faucet handles for domestic plumbing installations E03C1/04)} - B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES - F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)} - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS - B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES ## Abstract A drain valve for a compressed air brake system of a vehicle comprises a valve housing defining a valve chamber open at one end and a drain aperture at the opposite end. A poppet has a poppet body at least partially received in the valve chamber and provided with a seal. The poppet is slidable between a closed position in which the poppet and the seal contact the inner wall of the valve housing around the drain aperture thereby closing the drain aperture, and an open position moved away from the drain aperture. A spring urges the poppet to the closed position. The poppet and the seal are incorporated in a single multi-component injection molded plastic part comprising at least two components. The poppet body is formed of a first plastic component and the seal is formed of a second plastic component partially embedded in the first plastic component. ## Claims ### Claim 1 A drain valve for a compressed air brake system of a vehicle, the drain valve comprising: a valve housing (2) defining a valve chamber open at one end and having a drain aperture (6) at the opposite end of the valve housing, a poppet (12) having a poppet body at least partially received in the valve chamber and being provided with a seal (20), the poppet being slidable between a closed position in which the seal contacts the inner wall of the valve housing around the drain aperture (6) thereby closing the drain aperture, and an open position moved away from the drain aperture, and a spring (28) acting between the valve housing and the poppet urging the poppet to the closed position, the poppet (12) and the seal (20) being incorporated in a single multi-component injection molded plastic part comprising at least two components, the poppet body being formed of a first plastic component and the seal formed of a second plastic component partially embedded in the first plastic component, in that the poppet (12) comprises a disc (18) disposed in the valve chamber and a stem (16) extending from the disc and through the drain aperture (6), the first plastic component of the single multi-component injection molded plastic part forming the disc (18) and the stem (16), the disc comprising an annular groove coaxial with the stem and extending partly through the disc, the second plastic component filling the annular groove and projects beyond the disc surface to form an annular sealing ring embedded in the first plastic component of the disc of the poppet body, and in that the stem comprises an end region remote from the disc with the end region defining a through hole (14) for receiving a ring, wherein a slot (15) of smaller width than the diameter of the through hole connects the hole to the exterior surface of the stem such that a ring can be pressed into the slot and can, under elastic deformation of the stem around the slot, be pushed through the slot and into the hole such that the stem snaps into place once the ring reached the hole. ### Claim 2 (depends on 1) The drain valve according to claim 1, wherein the first and second plastic components of the single multi-component injection molded plastic part include interlaced structures (19) of the first and second components to provide for a secure interconnection and a high stability of the composite multi-component injection molded plastic part. ### Claim 3 (depends on 1) The drain valve according to claim 1, wherein channels extend through the disc of the poppet body which connect the annular groove to the opposite surface of the disc and the channels being filled with the second plastic component. ### Claim 4 (depends on 1) The drain valve according to claim 1, wherein the first plastic component has a Shore hardness D in the range between 65 and 85. ### Claim 5 (depends on 1) The drain valve according to claim 1, wherein the second plastic component has a Shore hardness A in the range between 50 and 70. ### Claim 6 (depends on 1) The drain valve according to claim 1, wherein the second plastic component comprises a thermoplastic elastomer. ### Claim 7 (depends on 1) The drain valve according to claim 1, wherein the first plastic component comprises a polyamide. ### Claim 8 (depends on 1) The drain valve according to claim 1, wherein the first plastic component comprises a fibre reinforced polyamide. ### Claim 9 (depends on 7) The drain valve according to claim 7, wherein the polyamide is a polyamide 12. ### Claim 10 (depends on 7) The drain valve according to claim 7, wherein the second plastic component consists of a fibre reinforced polyamide including 30-50 vol. % fibres. ### Claim 11 (depends on 2) The drain valve according to claim 2, wherein the first plastic component has a Shore hardness D in the range between 65 and 85. ### Claim 12 (depends on 2) The drain valve according to claim 2, wherein the second plastic component has a Shore hardness A in the range between 50 and 70. ### Claim 13 (depends on 2) The drain valve according to claim 2, wherein the second plastic component comprises a thermoplastic elastomer. ### Claim 14 (depends on 2) The drain valve according to claim 2, wherein the first plastic component comprises a polyamide. ### Claim 15 (depends on 2) The drain valve according to claim 2, wherein the first plastic component comprises a fibre reinforced polyamide. ### Claim 16 (depends on 8) The drain valve according to claim 8 wherein the polyamide is a polyamide 12. ### Claim 17 (depends on 8) The drain valve according to claim 8, wherein the second plastic component consists of a fibre reinforced polyamide including 30-50 vol. % fibres. ### Claim 18 (depends on 3) The drain valve according to claim 3, wherein the first plastic component has a Shore hardness D in the range between 65 and 85. ### Claim 19 (depends on 3) The drain valve according to claim 3, wherein the second plastic component has a Shore hardness A in the range between 50 and 70. ### Claim 20 (depends on 3) The drain valve according to claim 3, wherein the second plastic component comprises a thermoplastic elastomer. ### Claim 21 (depends on 3) The drain valve according to claim 3, wherein the first plastic component comprises a polyamide. ### Claim 22 (depends on 3) The drain valve according to claim 3, wherein the first plastic component comprises a fibre reinforced polyamide. ### Claim 23 (depends on 9) The drain valve according to claim 9, wherein the second plastic component consists of a fibre reinforced polyamide including 30-50 vol. % fibres. ### Claim 24 (depends on 4) The drain valve according to claim 4, wherein the second plastic component has a Shore hardness A in the range between 50 and 70. ### Claim 25 (depends on 4) The drain valve according to claim 4, wherein the second plastic component comprises a thermoplastic elastomer.