A single screw compressor comprising: a housing; and a main rotor that is secured within the housing and rotatably driven by a main rotor drive shaft about a main rotor drive shaft axis, and operably engaged with a plurality of gate rotors (16, 18) that are also secured within the housing; wherein the compressor further comprises: a high suction pressure load balance assembly, the assembly comprising a sealing baffle that is keyed to, so as to be rotatable along with, the main rotor drive shaft, and wherein the sealing baffle is configured to create a force or load to counteract an axial force of the main rotor drive shaft created during rotation of the main rotor, wherein the compressor further comprises at least one bearing positioned between the housing and the main rotor drive shaft, and a seal housing, the single screw compressor being characterised in that it further comprises at least two seals (92a, 92b) positioned with respect to the seal housing, and a seal pressure cavity defined by the at least one bearing, the housing, the seal housing, the at least two seals (92a, 92b) and the main rotor drive shaft, wherein the sealing baffle projects into the seal pressure cavity and the sealing baffle is positioned between the bearing and the shaft seals (92a, 92b). a housing; and a main rotor that is secured within the housing and rotatably driven by a main rotor drive shaft about a main rotor drive shaft axis, and operably engaged with a plurality of gate rotors (16, 18) that are also secured within the housing; wherein the compressor further comprises: a high suction pressure load balance assembly, the assembly comprising a sealing baffle that is keyed to, so as to be rotatable along with, the main rotor drive shaft, and wherein the sealing baffle is configured to create a force or load to counteract an axial force of the main rotor drive shaft created during rotation of the main rotor, wherein the compressor further comprises at least one bearing positioned between the housing and the main rotor drive shaft, and a seal housing, the single screw compressor being characterised in that it further comprises at least two seals (92a, 92b) positioned with respect to the seal housing, and a seal pressure cavity defined by the at least one bearing, the housing, the seal housing, the at least two seals (92a, 92b) and the main rotor drive shaft, wherein the sealing baffle projects into the seal pressure cavity and the sealing baffle is positioned between the bearing and the shaft seals (92a, 92b). a high suction pressure load balance assembly, the assembly comprising a sealing baffle that is keyed to, so as to be rotatable along with, the main rotor drive shaft, and wherein the sealing baffle is configured to create a force or load to counteract an axial force of the main rotor drive shaft created during rotation of the main rotor, wherein the compressor further comprises at least one bearing positioned between the housing and the main rotor drive shaft, and a seal housing, the single screw compressor being characterised in that it further comprises at least two seals (92a, 92b) positioned with respect to the seal housing, and a seal pressure cavity defined by the at least one bearing, the housing, the seal housing, the at least two seals (92a, 92b) and the main rotor drive shaft, wherein the sealing baffle projects into the seal pressure cavity and the sealing baffle is positioned between the bearing and the shaft seals (92a, 92b).