VALVE

摘要

FIELD: machine building.SUBSTANCE: gate with a press-fit seal resting against a seat insert is set in a valve casing. The casing is fitted by a sliding nut with one its side interacting with a stem tip of square section which is set with a gap at the faces of a square hole of the sliding nut. The stem interacts with a bush through the seal by elastic rings embraced by a fluoroplastic collar and with a thrust bearing by its end face. On the other side the sliding nut by its tail interacts with the gate through a ball at valve closing and in the start time of opening as well as with a pin at further opening of the valve up to full stop in the bush end face which are installed in the sliding nut tail. The sliding nut comprises holes for the passage of the working medium through them and through the gaps of the square opening of the sliding nut with the stem tip faces to equalise pressure difference before and after the sliding nut.EFFECT: improved reliability, durability and easier operation of a valve without repair during the whole specified service life due to the decreased friction factor in contacting parts.3 dwg