| 摘要 |
FIELD: machine building.SUBSTANCE: valve includes a tight body with inlet and outlet branch pipes, a shutoff element in the form of a hollow cylindrical sleeve connected to a drive providing back-and-forth movement along the housing axis, a cylindrical insert enclosed with a cylindrical part of the shutoff element, the inner end face of which contacts a seat; shutoff element and insert are located coaxially on one and the same axis. The seat is made in the form of a flattened cone located on a lower thickened part of the insert, in the lower part of which a through hole is made and in its upper end face a blind hole is made. On upper end of the shutoff element there are cylindrical segments. Axis of shutoff element and insert is located at an angle to a common axis of inlet and outlet branch pipes. A drive is connected to the shutoff member through a spindle fixed against axial movement in upper part of the cover plate with a stop ring and a coupling nut, and a movable stock interacting with the spindle and equipped in its middle part at least with two external projections, in which cylindrical slots are made, which contact the segments of shutoff element, and external semi-cylindrical slots, the axes of which are parallel to the stock axis. On the insert end there fixed is a hold-down ring in the holes of which ends at least of two guide posts are fixed; at that, hold-down ring is equipped with seals, one of which is enclosed with internal cylindrical surface of the shutoff element, and the other one encloses external surface of movable stock. In upper part of the housing there located is an insert provided with a central hole for stock movement, lower holes for fastening of other ends of guide posts and blind upper threaded holes; upper hold-down ring with stock seal and housing seal is located on the insert. A flywheel and a nut with a position indicator of the shutoff element with a pin are located in upper part of the spindle. A working fluid pass is formed between external surface of the shutoff element and internal surface of the housing.EFFECT: valve allows reducing forces required for movement of the shutoff element and simultaneous improvement of operation stability.4 cl, 7 dwg |
