MAINLINE ISOLATION VALVE OF MODULAR DESIGN FOR INTERNAL INSTALLATION, HIGH PRESSURES AND TEMPERATURES Russian patent published in 2009 - IPC F16K39/02 F16K27/02 

FIELD: pipeline valves.

SUBSTANCE: invention is referred to hydro-pneumoautomatics and particularly, to globe valves. The invention is intended for controlling and shutting off operating medium in process pipelines or mainlines transporting, mainly gaseous medium with high pressure and temperature in oil, gas, chemical and other industries. The valve consists of a housing with attachment flanges and central vertical and cylindrical boring and two spring-loaded isolation elements located coaxially in the boring. The isolation elements open sequentially. The second auxiliary isolation element is implemented with reduced geometrical parametres as compared to the first isolation element. It is mated with servo drive rod without any clearance. Guiding cylinder of the second isolation element is located coaxially to the guiding cylinder of the main isolation element fixed coaxially to the housing. Attachment flanges of the isolation valve with mounting holes and sealing end elements are implemented as an integral part of the housing. The flange connectors are on the surface crossing the centres of operating medium inlets and outlets. The central boring in the housing is made multistage forming closed circular cavities of working fluid inlet and outlet and circular loading cavity. Together with servo drive rod, the said valve with the main and auxiliary isolation elements is implemented as a one-piece module provided with a possibility of being installed into the main-line system. It is designed in the form of two hydraulically connected and sequentially interacting automatic control units of the main and auxiliary isolation elements ensured with valve-seat type shutoff elements and common domineering pressure chamber. The above mentioned automatic control units are installed coaxially in the central multi-stage boring of housing and guiding cylinder. The common domineering pressure chamber is placed between the said devices so that it can be connected with control pressure source through the choke.

EFFECT: improved valve reliability, performance and operational parametres.

4 cl, 5 dwg