Valve

In combination with two pipe lines, such as a milk line and a vacuum line of a milking system, a valve for connecting said pipe lines to a machine, such as a milking machine, the valve comprising a housing attached to one of said pipe lines, a slide rotatable in the housing, the housing having two openings communicating respectively with said two pipe lines, a pair of valve seats surrounding said two openings, respectively, and located in diametrically opposite positions in the housing, said slide having sealing surfaces cooperating with said valve seats and also having a recess, a connection piece insertable in said recess and having opposite openings, and a pair of hoses of said machine connected to said opposite openings, respectively, the connection piece having sealing surfaces surrounding said opposite openings and cooperating with said valve seats when the connection piece is inserted in said recess, said piece being operable in said recess to rotate the slide between a connected position in which the hoses are connected to respective ones of said pipe lines and a disconnected position in which the hoses are disconnected from said pipe lines.