Refrigeration circuit circulating a refrigerant and comprising in the direction of flow of the refrigerant: at least one compressor (4a, 4b, 4c); at least one heat rejecting heat exchanger (6, 6a, 6b); a receiver; at least one expansion device; and at least one evaporator; the refrigeration circuit further comprising: at least one heat recovery heat exchanger having a refrigeration circuit side and a heat recovery system side and being configured for transferring heat between the refrigeration circuit side and the heat recovery system side, wherein the refrigeration circuit side is fluidly connected between the outlet side of the at least one compressor (4a, 4b, 4c) and a receiver outlet line for flowing circulating refrigerant through the refrigeration circuit side; and at least one regulation valve, which is swit chable between an open position, in which the regulation valve is completely open; a closed position, in which the regulation valve is completely closed; and at least one intermediate position, in which the regulation valve is partially open; wherein the regulation valve is a three-way valve which is arranged between the receiver and the expansion device and fluidly connected to the outlet side of the at least one heat recovery heat exchanger's refrigeration circuit side for controlling the flow of refrigerant flowing through the refrigeration circuit side and for controlling the flow of refrigerant from the receiver to the expansion device. at least one compressor (4a, 4b, 4c); at least one heat rejecting heat exchanger (6, 6a, 6b); a receiver; at least one expansion device; and at least one evaporator; the refrigeration circuit further comprising: at least one heat recovery heat exchanger having a refrigeration circuit side and a heat recovery system side and being configured for transferring heat between the refrigeration circuit side and the heat recovery system side, wherein the refrigeration circuit side is fluidly connected between the outlet side of the at least one compressor (4a, 4b, 4c) and a receiver outlet line for flowing circulating refrigerant through the refrigeration circuit side; and at least one regulation valve, which is swit chable between an open position, in which the regulation valve is completely open; a closed position, in which the regulation valve is completely closed; and at least one intermediate position, in which the regulation valve is partially open; wherein the regulation valve is a three-way valve which is arranged between the receiver and the expansion device and fluidly connected to the outlet side of the at least one heat recovery heat exchanger's refrigeration circuit side for controlling the flow of refrigerant flowing through the refrigeration circuit side and for controlling the flow of refrigerant from the receiver to the expansion device. at least one heat recovery heat exchanger having a refrigeration circuit side and a heat recovery system side and being configured for transferring heat between the refrigeration circuit side and the heat recovery system side, wherein the refrigeration circuit side is fluidly connected between the outlet side of the at least one compressor (4a, 4b, 4c) and a receiver outlet line for flowing circulating refrigerant through the refrigeration circuit side; and at least one regulation valve, which is swit chable between an open position, in which the regulation valve is completely open; a closed position, in which the regulation valve is completely closed; and at least one intermediate position, in which the regulation valve is partially open; an open position, in which the regulation valve is completely open; a closed position, in which the regulation valve is completely closed; and at least one intermediate position, in which the regulation valve is partially open; wherein the regulation valve is a three-way valve which is arranged between the receiver and the expansion device and fluidly connected to the outlet side of the at least one heat recovery heat exchanger's refrigeration circuit side for controlling the flow of refrigerant flowing through the refrigeration circuit side and for controlling the flow of refrigerant from the receiver to the expansion device.