Drain valve

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.