A seal arrangement for a process device or plant, having a. a component arrangement with two components (1, 2) that sectionally adjoin one another in the region of a gap, wherein a groove is formed on one of the two components in the direction of the gap, said groove being formed in an L-shaped manner and being open toward an edge of the gap, wherein a first groove limb of the groove extends perpendicularly to the plane of the gap, and wherein a further groove limb is oriented perpendicularly to the first groove limb, which is formed so as to be open toward the space, b. wherein a seal has been inserted into the groove, said seal likewise having an L-shape, corresponding to the L-shape of the groove, to which end it has a first sealing limb and a second sealing limb perpendicular thereto, c. wherein the first sealing limb is designed such that it is inserted into the first groove limb, and the second sealing limb is designed such that it is insertable into the second groove limb and clamped tightly there, d. wherein, in the non-inserted state, the seal has an oversize relative to the dimensions of the groove and is inserted into the groove as such and tightly clamped therein, characterized in that e. the first sealing limb has, in a state in which it is not inserted into the first longitudinal limb of the groove, an oversize with respect to the groove in the region of a sealing foot, f. in each case one channel (104, 105, 106) extending perpendicularly to the seal cross section along the respective wall of the groove is formed at least on three outer faces (103a, b, c) of the first sealing limb that face the walls of the groove in the inserted and compressed state of the seal in the groove, and in that these one or more channels (104, 105, 106) are dimensioned such that, even in the state in which the sealing foot has been inserted into the groove limb, in the region of the channel (104, 105, 106) a spacing still exists in each case between the seal and the respectively associated inner wall of the groove, wherein at least two of these channels (105, 106) are formed in the region of the first longitudinal limb and extend approximately centrally in the region of the respective groove wall of this longitudinal limb, and g. in that, above the sealing foot, a sealing region is formed which has a peripheral face facing the gap edge, wherein the peripheral face is designed such that a substantially planar transition is formed between the peripheral faces of the components (1, 2), which extend at an angle to the gap plane, and the peripheral face. a. a component arrangement with two components (1, 2) that sectionally adjoin one another in the region of a gap, wherein a groove is formed on one of the two components in the direction of the gap, said groove being formed in an L-shaped manner and being open toward an edge of the gap, wherein a first groove limb of the groove extends perpendicularly to the plane of the gap, and wherein a further groove limb is oriented perpendicularly to the first groove limb, which is formed so as to be open toward the space, b. wherein a seal has been inserted into the groove, said seal likewise having an L-shape, corresponding to the L-shape of the groove, to which end it has a first sealing limb and a second sealing limb perpendicular thereto, c. wherein the first sealing limb is designed such that it is inserted into the first groove limb, and the second sealing limb is designed such that it is insertable into the second groove limb and clamped tightly there, d. wherein, in the non-inserted state, the seal has an oversize relative to the dimensions of the groove and is inserted into the groove as such and tightly clamped therein, characterized in that e. the first sealing limb has, in a state in which it is not inserted into the first longitudinal limb of the groove, an oversize with respect to the groove in the region of a sealing foot, f. in each case one channel (104, 105, 106) extending perpendicularly to the seal cross section along the respective wall of the groove is formed at least on three outer faces (103a, b, c) of the first sealing limb that face the walls of the groove in the inserted and compressed state of the seal in the groove, and in that these one or more channels (104, 105, 106) are dimensioned such that, even in the state in which the sealing foot has been inserted into the groove limb, in the region of the channel (104, 105, 106) a spacing still exists in each case between the seal and the respectively associated inner wall of the groove, wherein at least two of these channels (105, 106) are formed in the region of the first longitudinal limb and extend approximately centrally in the region of the respective groove wall of this longitudinal limb, and g. in that, above the sealing foot, a sealing region is formed which has a peripheral face facing the gap edge, wherein the peripheral face is designed such that a substantially planar transition is formed between the peripheral faces of the components (1, 2), which extend at an angle to the gap plane, and the peripheral face.