Patent ID: 8469051

Claim:
A valve for limiting the tank pressure in a motor vehicle, comprising a first line and a second line in a housing having two sections, wherein the first line is separated from the second line in a fluid-tight manner by means of a roller diaphragm and a single sealing seat; and a flow connection for fluid capable of being established between said first line and said second line wherein a first body is movable relative to a second body whilst said second body is fixed in place and said second body is movable relative to said first body whilst said first body is fixed in place, wherein said first body is braced against said second body via a spring and said sealing seat includes an elastomeric seal associated with said first body and a circumferential collar having a tapered design associated with said second body, wherein said first body has passages defined through said first body which establish a fluid-conducting connection between said first line and a sealing seat chamber enclosed by the first body and the second body, wherein one of said first body and said second body lifts up from said sealing seat when movable relative to the other body, and wherein said first body, said second body, and said sealing seat as a whole form a movable unit and wherein said fluid can flow out of the sealing seat chamber from the first line to the second line when said first body moves relative to said second body and fluid can flow through the sealing seat chamber from the second line to the first line when said second body moves relative to said first body and wherein the roller diaphragm is clamped to said second body and between said two housing sections and is able to rest against a rounded support shoulder that projects from the housing wall; and a guide connected to said first moveable body, wherein said guide provides a support shoulder for said spring bracing said first body to said second body and said guide interacts with said housing to guide said movable unit in said housing without jamming or tilting.