ШАРОВОЙ КРАН ДВУХСТОРОННЕГО ДЕЙСТВИЯ ДЛЯ ВЫСОКИХ ДАВЛЕНИЙ

摘要

FIELD: valving. ^ SUBSTANCE: ball cock comprises housing with through opening with double-sided steps, horizontal inlet and outlet sections for flowing fluid that are interconnected through the space that separates them, and vertical inner bore-neck. The neck receives driving shaft provided with the base of the control handle. The ball valving member is provided with the through central passage and is mounted for permitting rotation in the vertical plane by an angle of 90°. Two movable seats-seals are flexibly loaded by pressing devices. The seats-seals are arranged from both sides of the valving member with central concave spherical sections which are in a contact with the surface of the valving member. One seat is mounted in the cylindrical bore provided in the housing. The other seat is mounted for permitting interaction with the axially movable bushing sealed over the outer cylindrical surface. The neck of the housing is stepped, and its larger step is arranged from the side of the separating space. The bore receives the antifriction coaxial cylindrical bushing-insert provided with the outer ring collar. The bushing is mounted for permitting simultaneous contact and interaction with the corresponding sealing surface of the driving shaft and fitting inner surface of the base of the control handle. The bushing is provided with the locking member that prevents it against rotation. The seats-seals together with the pressing members are built in the common cylindrical bore in the housing. The diameter of the bore is equal to the diameter of the guiding surface of the axially movable bushing. The diameter of the cylindrical bore in the housing is related to the diameter of the ball valving as 1.06-1.1. The edges of intersection of the spherical surface with the open surface of the face and cylindrical surface of the flowing passage of each seat-seal are beveled to define two axially aligned truncated cones. The tops of the cones face pressing devices and are in coincidence with the axis of rotation. The diameter of the grater base of the truncated cone is equal to the diameter of the base of the spherical belt. The diameter of the lesser base of the truncated cone does not exceed the width of the ball belt of the valving member. ^ EFFECT: enhanced reliability. ^ 1 cl, 3 dwg