THREE-WAY SPHERICAL VALVE WITH UPPER CONNECTION Russian patent published in 2006 - IPC F16K11/87 F16K5/20 

FIELD: pipe fittings for distributing liquid or gaseous fluids under low or high pressure in gas supply system, gas utilization and heat-and-water supply systems.

SUBSTANCE: three-way spherical valve with upper connection has casing with upper flange and branch pipes. Integral seats are disposed in casing and are cooperating with spherical stopper located in supports between seats. Said seats are permanently spring-loaded toward spherical stopper. Seat unclamping apparatus is positioned at side adjoining upper flange. Valve is additionally furnished with spring-loaded "dead-end" seat. Axis of this seat is arranged in plane of axes of set seats. Each of said seats is equipped at side adjoining spherical stopper with bead and cylindrical surface before the latter so as to define cavities between adjacent seats. Seat unclamping apparatus is furnished with four pins. Arrangement of pins corresponds to arrangement of seats within valve casing so that pins may be located within cavities defined between adjacent seats. Each of said pins is provided with two wedge-shaped surfaces. These surfaces are extending perpendicular to each other at outer side of apparatus.

EFFECT: accessibility for repair of valve without necessity of cutting said valve off from pipeline, reduced time and labor intensity for assembling or disassembling of valve, simplified construction of seat unclamping apparatus and provision for tight sealing of gate in any of its positions.

9 dwg