Patent ID: 7726625

Claim:
A device for providing a seal in an injection valve system including a housing, a first plunger, and a second plunger that translates relative to the first plunger during operation, the device comprising: a first body which has a recess; a second body which is introduced into the recess, wherein the second body moves relative to the first body during translation of the first plunger relative to the second plunger; and an elastomer seal, which is inserted between the first and second body in the recess and thus in this area, closes and seals the space between the first and second body, wherein the elastomer comprises: a first side; a second side opposite the first side; an outer circumferential surface located generally between the first and second sides and forming a seal with the first body; an inner circumferential surface located generally between the first and second sides and forming a seal with the second body; and a first groove formed in the first side of the elastomer seal and spaced apart from the outer circumferential surface of the elastomer seal, the first groove extending at least partly along the recess while located at a distance from the wall of the recess; a second groove formed in the first side of the elastomer seal; a fluid chamber defined between the first plunger and the elastomer seal, wherein the elastomer seal prevents fluid in the fluid chamber from flowing past the elastomer seal and out of the fluid chamber, wherein the first side of the elastomer seal including the first and second grooves faces into the fluid chamber such that fluid pressure in the fluid chamber acts on the grooves to increase the sealing force of the elastomer seal; and a tensioning means configured to support the elastomer seal in the space between the first and second bodies.