BALL VALVE WITH UPPER JOINT FOR POWER ENGINEERING OBJECTS Russian patent published in 2010 - IPC F16K5/20 

FIELD: power engineering.

SUBSTANCE: pipeline valve for power engineering objects is characterised by high parametres of working mediums - temperature up to 560°C, pressure up to 40 MPa, and is intended to isolate flows. Ball valve with upper joint comprises body with the following components joined to it by threaded connections - upper flange, inlet and outlet nozzles and ball plug. Plug is installed onto spring-loaded seats with contact surfaces in the form of ball belt. Spring-loaded seats are installed into additional circular bushes equipped with circular collars. These bushings are sealed along end surface relative to body of ball valve. Specified contact surfaces of seats are arranged as at least double-contour along width of ball belt. Contours on surface of ball belt are separated by at least one circular bore. Additional circular bushings are installed coaxially to seats and are fixed on the latter along threaded surface with the possibility to transfer pressing force to mentioned seals. In seat, in zone of threaded contact surface of additional bushing and seat, there is at least one through channel arranged as connecting to circular bore. Seals between end surface of additional circular bushings and body are arranged as gland seals.

EFFECT: expansion of temperature range and pressure range for medium, where ball valve is used, increased reliability and durability.

4 cl, 2 dwg