Abstract: The invention relates to a fail-safe rotary actuator (1) for a coolant circuit, in particular for a coolant circuit of an internal combustion engine (2) having a plurality of sub-circuits (3) and (4), includes a coolant delivery pump (5) for circulating the coolant within the coolant circuit, and having a rotary-slide housing (8) which has a plurality of housing pass-through openings (6) and (7) and in which at least one rotary slide (9) having at least one rotary slide pass-through opening (11) and (12) is rotatably supported, wherein the housing pass-through openings (6) and/or (7) are fluidly connected to at least one sub-circuit (3) and/or (4), and can be brought into at least partial coincidence with the rotary slide pass-through openings (11) and/or (12) by a rotary motion of the rotary slide (9), wherein a thermostat valve (13) opens a flow path running parallel to the rotary slide (9) from one of the sub-circuits (3) or (4) to the coolant delivery pump (5), when a temperature limit of the coolant is e

Abstract: Coolant circuit, in particular a coolant circuit having a plurality of sub-circuits 1, 2, 3 of an internal combustion engine 11 includes a primary cooling circuit 1 and a heating circuit 2 as well as a coolant delivery pump 5 disposed on a rotary actuator 4, with the rotary actuator 4 having a rotary-slide housing 20 with several ports 8a, 8b, 9a, 9b, 10a through which coolant can flow, and a first and at least one second rotary slide 6 and 7 which are rotatably supported in the rotary-slide housing 20 and have each at least one rotary-slide pass-through opening 8, 9, 10 forming a flow path, wherein the ports 8a, 8b, 9a, 9b, 10a can be brought into at least partial coincidence with the rotary-slide pass-through openings 8, 9, 10 by a rotary motion of the respective rotary slide 6 and/or 7), wherein a first branch 1a of the primary cooling circuit 1 leads from the internal combustion engine 11 via a main radiator 12 to a main radiator port 8b of the first rotary slide and can be controlled by the first rotary

Abstract: The invention relates to a fail-safe rotary actuator (1) for a coolant circuit, in particular for a coolant circuit of an internal combustion engine (2) having a plurality of sub-circuits (3) and (4), includes a coolant delivery pump (5) for circulating the coolant within the coolant circuit, and having a rotary-slide housing (8) which has a plurality of housing pass-through openings (6) and (7) and in which at least one rotary slide (9) having at least one rotary slide pass-through opening (11) and (12) is rotatably supported, wherein the housing pass-through openings (6) and/or (7) are fluidly connected to at least one sub-circuit (3) and/or (4), and can be brought into at least partial coincidence with the rotary slide pass-through openings (11) and/or (12) by a rotary motion of the rotary slide (9), wherein a thermostat valve (13) opens a flow path running parallel to the rotary slide (9) from one of the sub-circuits (3) or (4) to the coolant delivery pump (5), when a temperature limit of the coolant is e

Abstract: Coolant circuit, in particular a coolant circuit having a plurality of sub-circuits 1, 2, 3 of an internal combustion engine 11 includes a primary cooling circuit 1 and a heating circuit 2 as well as a coolant delivery pump 5 disposed on a rotary actuator 4, with the rotary actuator 4 having a rotary-slide housing 20 with several ports 8a, 8b, 9a, 9b, 10a through which coolant can flow, and a first and at least one second rotary slide 6 and 7 which are rotatably supported in the rotary-slide housing 20 and have each at least one rotary-slide pass-through opening 8, 9, 10 forming a flow path, wherein the ports 8a, 8b, 9a, 9b, 10a can be brought into at least partial coincidence with the rotary-slide pass-through openings 8, 9, 10 by a rotary motion of the respective rotary slide 6 and/or 7), wherein a first branch la of the primary cooling circuit 1 leads from the internal combustion engine 11 via a main radiator 12 to a main radiator port 8b of the first rotary slide and can be controlled by the first rotary