PLUG COCK Russian patent published in 2007 - IPC F16K5/06 F16K27/10 

FIELD: valving systems.

SUBSTANCE: plug cock comprises housing that has outer shell and inlet and outlet branch pipes welded to the housing. The housing receives sealing seats. The seats are pressed to the plug by means of bushings. The bushings are mounted in the housing by means of thread. The threaded surfaces for setting the bushings are made inside the shell at the distance L from the faces. The length of the threaded surfaces exceeds the length of the outer threaded surface on the bushing by the value of L. The bushing are mounted for permitting movement inside the shell toward the plug within the distance L/n, were n ≥ 2. When operating, the bushings are rigidly connected with the housing.

EFFECT: enhanced maintainability.

6 cl, 3 dwg