STOP UNIT Russian patent published in 2012 - IPC F16K3/02 

FIELD: construction.

SUBSTANCE: stop unit comprises a casing, a cover, a spindle and a short gate arranged between seats. Seats are made in the form of two rings. Rings are installed in casing bores and are fixed with a spacer below their throughput hole at the side of the casing cavity bottom. The spacer at the side of the throughput hole of the seats has a groove. The value of the groove radius is equal to the radius of seats throughput section. The gate at the side of the casing cavity bottom has an identical ledge. The spacer is placed in the casing cavity on two tension springs arranged along the gate as capable of matching the spacer groove with the throughput hole of the seats.

EFFECT: improved reliability of gate valve operation due to damping effect of throughput hole configuration in a stop unit and protection of seats against effect of abrasive-containing flow in area of its jamming.

3 cl, 3 dwg