A screw compressor, comprising: a compressor housing defining a working chamber, the housing including a plurality of bores (120A, 120B); a first rotor having helical threads, the first rotor being housed in a first of the plurality of bores (120A, 120B); a second rotor having helical threads intermeshing with the helical threads of the first rotor, the second rotor being housed in a second of the plurality of bores (120A, 120B); an inlet suction port that receives a fluid to be compressed; an outlet discharge port that receives a compressed fluid; a compression chamber formed by the intermeshing of the helical threads of the first rotor and the helical threads of the second rotor between the inlet suction port and the outlet discharge port; and an intermediate discharge port fluidly connectable to the compression chamber and disposed between the inlet suction port and the outlet discharge port to allow a working fluid to leave the compression chamber prior to reaching the outlet discharge port, the screw compressor being characterised in that the intermediate discharge port being disposed at a portion of the compressor housing so that a biasing mechanism included in the intermediate discharge port is passively controlled based on a pressure differential between the compression chamber and a discharge of the screw compressor at the outlet discharge port to selectively transition the intermediate discharge port between a flow-blocked state and a flow-permitted state, the intermediate discharge port including a sealing member having a sealing surface and forms a sealing engagement with a surface within the intermediate discharge port when biased by the biasing mechanism to be in the flow-blocked state so that fluid flow is prevented between the compression chamber and the intermediate discharge port when in the flow-blocked state, and fluid flow being enabled from the compression chamber through the intermediate discharge port when biased by the biasing mechanism to be in the flow-permitted state in which the sealing surface is disengaged from sealing engagement with the surface within the intermediate discharge port. a compressor housing defining a working chamber, the housing including a plurality of bores (120A, 120B); a first rotor having helical threads, the first rotor being housed in a first of the plurality of bores (120A, 120B); a second rotor having helical threads intermeshing with the helical threads of the first rotor, the second rotor being housed in a second of the plurality of bores (120A, 120B); an inlet suction port that receives a fluid to be compressed; an outlet discharge port that receives a compressed fluid; a compression chamber formed by the intermeshing of the helical threads of the first rotor and the helical threads of the second rotor between the inlet suction port and the outlet discharge port; and an intermediate discharge port fluidly connectable to the compression chamber and disposed between the inlet suction port and the outlet discharge port to allow a working fluid to leave the compression chamber prior to reaching the outlet discharge port, the screw compressor being characterised in that the intermediate discharge port being disposed at a portion of the compressor housing so that a biasing mechanism included in the intermediate discharge port is passively controlled based on a pressure differential between the compression chamber and a discharge of the screw compressor at the outlet discharge port to selectively transition the intermediate discharge port between a flow-blocked state and a flow-permitted state, the intermediate discharge port including a sealing member having a sealing surface and forms a sealing engagement with a surface within the intermediate discharge port when biased by the biasing mechanism to be in the flow-blocked state so that fluid flow is prevented between the compression chamber and the intermediate discharge port when in the flow-blocked state, and fluid flow being enabled from the compression chamber through the intermediate discharge port when biased by the biasing mechanism to be in the flow-permitted state in which the sealing surface is disengaged from sealing engagement with the surface within the intermediate discharge port. the intermediate discharge port being disposed at a portion of the compressor housing so that a biasing mechanism included in the intermediate discharge port is passively controlled based on a pressure differential between the compression chamber and a discharge of the screw compressor at the outlet discharge port to selectively transition the intermediate discharge port between a flow-blocked state and a flow-permitted state, the intermediate discharge port including a sealing member having a sealing surface and forms a sealing engagement with a surface within the intermediate discharge port when biased by the biasing mechanism to be in the flow-blocked state so that fluid flow is prevented between the compression chamber and the intermediate discharge port when in the flow-blocked state, and fluid flow being enabled from the compression chamber through the intermediate discharge port when biased by the biasing mechanism to be in the flow-permitted state in which the sealing surface is disengaged from sealing engagement with the surface within the intermediate discharge port.