Oil-injected screw compressor

A compressor comprising:

• a hollow casing within which a reservoir for air and oil is realized and on which, in an upper position, a suction group for air from outside the reservoir comprising at least an air intake valve and at least an air filter, on one lateral end a flow block provided with an oil/air separation device and an oil filter and at least a valve for extracting compressed air are disposed, said casing being provided with an opening on the opposite side with respect to the said on which the flow block is provided, wherein
• a first flange to which a screw compression unit is fixed that when the first flange is placed to close the opening causes the insertion into the reservoir of said unit, wherein inside the reservoir a sheet is provided arranged along a longitudinal direction with respect to the reservoir in an intermediate position between the lower area of oil accumulation and the upper area used for the separation of the air and oil mixture, said sheet being extractable since said sheet is supported by side rails integrally provided on the casing allowing said sheet to slide.