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. Compression head: The compression head is built with steel blocks to our own specifications and are forged and checked using ultrasound technology. Each head can contain pumping pistons of differing diameter to control machine capacity at reduced cost. The motion of the bearing pistons with hard chrome, carbide and tungsten or all-ceramic coverings, is guided by special guide rings. This means that the seals of the pumping pistons are spared this task, thus assuring a longer working life.	.