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A valve assembly for permitting relatively free flow in a first direction and for preventing flow in a second, opposite direction in a flow path includes a housing having first and second ports and defining a housing interior having an interior surface. A resilient flow regulator includes a pair of

A valve assembly for permitting relatively free flow in a first direction and for preventing flow in a second, opposite direction in a flow path includes a housing having first and second ports and defining a housing interior having an interior surface. A resilient flow regulator includes a pair of lips arranged in a converging relationship to define for the regulator an open end and a normally closed end. At the normally closed end, the lips are disposed adjacent each other to define a normally closed slit therebetween, and to define inner and outer surfaces for the lips. The regulator further includes at least one side wall interconnecting the lips. The regulator is secured within the housing interior so that flow in the first direction is from the first port, through the open end, through the normally closed end, and to the second port. The housing interior defines a shape such that the regulator is secured therein by the securing means with the outer surface of each of the lips being substantially adjacent to the housing interior surface.

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Valve assembly for use within a flow path for permitting relatively free flow in said flow path in a first direction and for preventing flow in said path in a second, opposite direction, comprising: a housing defining a housing interior having an interior surface and having first and second ports op

Valve assembly for use within a flow path for permitting relatively free flow in said flow path in a first direction and for preventing flow in said path in a second, opposite direction, comprising: a housing defining a housing interior having an interior surface and having first and second ports opening into said housing; a flow regulator constructed as a single piece from a resilient material, said regulator including a pair of planar lips arranged in a converging relationship to define for said regulator an open end and a normally closed end whereat said lips are disposed adjacent each other to define a normally closed slit therebetween and to define inner and outer planar surfaces for said lips, said regulator further including at least one side wall interconnecting said lips; means for securing said regulator within said housing interior with said normally closed end toward said second port and said open end toward said first port; and means for forming a seal between said open end of said regulator and said housing interior so that flow in said first direction is from said first port, through said open end, through said normally closed end and to said second port; said housing interior defining a shape such that said regulator is secured therein by said securing means with said outer surface of each of said lips being substantially adjacent to said housing interior surface when said normally closed end of said regulator is closed; and said first and said second ports each having a cross-sectional area smaller than any cross-sectional area of said housing interior, said second port opening into said housing immediately adjacent said normally closed end of said regulator.