PRE-ADJUSTED VALVING DESIGNED WITH POSSIBILITY OF MULTISTAGE SWITCHING Russian patent published in 2015 - IPC F16K31/122 

FIELD: machine building.

SUBSTANCE: pre-adjusted valving with one mechanical part located in the valve body for multistage switching of compressed air flow between a supply pressure connection element and a working pipeline connection element. By means of a throttling device in one switching step the throttling compressed air flow can be switched. The pre-adjustment pneumatic device contains the first control piston, which is located in the first control chamber, designed in the valve body, and which contains a concentric recess for formation of the second control chamber, which contains the second control piston. Meanwhile the additional supply of control pressure into control chambers results in telescopic advancement of a pusher out of the second control piston for initiation of multistage control stroke for the mechanical part of the valve, so that in one stage of switching of mechanical part of the valve (located between closed and open positions of the valve) to form a throttling compressed airflow.

EFFECT: invention is aimed at compactness and simplification of the valving design.

10 cl, 1 dwg, 1 tbl