FIELD: code units. SUBSTANCE: code unit has body with hole accommodating control valve made for communication of pressure source of working medium with user. Body has code disc with indicators. Control valve is made in the form of a package of coaxial turning discs made for engagement with means for their turning. Disc peripheries has holes aligned with disc turning to form main through channel communicating working medium pressure source with user. EFFECT: higher level of coding and operating reliability. 10 cl, 13 dwg
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