FIELD: machine building.
SUBSTANCE: valve element for controlled non-return valve of fastening post includes housing (72, 74) of element. In housing (72, 74) there located is valve piston (78), U-shaped control piston (76) and piston spring (84). One end of valve piston is placed in guide piston (76) so that it can be moved. Control piston (76) has through hole (88) in its bottom (86). Inside control piston (76) between bottom (86) of piston and end of valve piston (78) there located is auxiliary piston (90). There is design of controlled non-return valve for fastening section of powered support.
EFFECT: pressure stabilisation of controlled non-return valve.
8 cl, 4 dwg
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