Self-inflating tire and pressure regulator device

A pressure regulator device (54) for a tire is proposed. The pressure regulator device comprises a regulator body (70) and a cap (120) connected to the regulator body, wherein the regulator body is connected to a duct (72)having a first end, and a second end connected to a chamber (80) formed between the cap and the regulator body; a flexible ring (90) mounted in the chamber and having one or more slots (98); and a pressure membrane (104)mounted over the flexible ring. The regulator body further comprises an inlet port for fluid communication with an outlet of end of an air tube or an air passageway and the chamber (80), an outlet port for fluid communication with the chamber (80) and an inlet end of an air tube or an air passageway, and an ambient air inlet in fluid communication with the chamber (80) and the pressure membrane (104). The flexible ring is positioned to seal the inlet port of the regulator body. The cap has a flanged portion about a recessed chamber. The flanged portion is positioned for sealing engagement with the pressure membrane. The recessed chamber is in fluid communication with the outlet port of the regulator body.