Patent ID: 8678048

Claim:
A three-way cock comprising a hollow cylinder-shaped housing ( 1 ) with two inlet ducts ( 2 and 3 ) and one outlet duct ( 4 ) and a means installed inside the housing ( 1 ) with a control lever ( 5 ) for switching on or switching off one of the inlet ducts ( 2 and 3 ) with the outlet duct ( 4 ), wherein the hollow cylinder-shaped housing ( 1 ) has three consecutively arranged annular compartments ( 6 , 7 , and 8 ), the inlet ducts ( 2 and 3 ) being connected to the first compartment ( 6 ) and the third compartment ( 7 ), respectively, and the outlet duct ( 4 ) being connected to the second (middle-positioned) compartment ( 7 ); the means for switching on and switching off the inlet ducts contains a valve ( 9 ) with an elastic face seal ( 10 ), the valve having an axial duct with an elastic annular seal ( 11 ) arranged in the third compartment ( 8 ) of the housing ( 1 ) and positioned in a saddle of the valve ( 9 ) with an option of an axial reciprocating movement thereof; a stem ( 12 ) of the valve arranged inside the housing of the cock with an option of an axial reciprocating movement thereof, one end ( 13 ) of the stem going out the housing ( 1 ) through the end wall thereof and kinematically connected to the control lever ( 5 ) and the other end ( 14 ) of the stem positioned in the opposite third compartment ( 8 ) of the housing ( 1 ), passes through the axial duct of the valve ( 9 ) sealed with the annual elastic seal ( 10 ) and is kinematically connected thereto by means of a first spring ( 15 ) which presses the valve ( 9 ) from the end ( 14 ) of the stem ( 12 ) to the saddle of the valve, which is formed by a ledge ( 16 ) made in the wall of the housing ( 1 ) between the second compartment ( 7 ) and the third compartment ( 8 ) thereof and an annular ledge ( 17 ) made on the stem ( 12 ); and further the stem ( 12 ) has an axial duct ( 18 ) closed on both ends thereof by plugs ( 19 ) and ( 20 ), a first series of radial through holes ( 21 ) made in the stem ( 12 ) for communicating the axial duct ( 18 ) thereof with the first compartment ( 6 ) of the housing and a second series of radial through holes ( 22 ) made in the stem ( 12 ) behind the annular ledge ( 17 ) thereof along the arrangement of the compartments ( 6 ), ( 7 ), and ( 8 ) of the housing for connecting the axial duct ( 18 ) of the stem with the second compartment ( 7 ) of the housing, wherein elastic annular seals ( 23 ) and ( 24 ) are installed between the housing ( 1 ) and the stem ( 12 ) on both sides of the first compartment ( 6 ) of the housing ( 1 ), and the second compartment ( 7 ) and the third compartment ( 8 ) are hermetically isolated from each other by means of the valve ( 9 ).