The Characteristics Of The Cut-off Valve
- Aug 28, 2017 -

(1) The cut-off valve structure is simpler than the floodgate valve, the manufacture and the maintenance are convenient.

(2) The sealing surface is not easy to wear and abrasion, good sealing, open and close the disc and valve body seal between the no relative sliding, so wear and abrasions are not serious, good sealing performance, long service life.

(3) When opening and closing, the disc travel is small, so the cut-off valve is smaller than the gate, but the structure length is longer than the gate valve.

(4) The headstock moment is big, the opening and closing is laborious, the headstock time principal.

(5) The fluid resistance is big, because the valve body medium channel is more tortuous, the fluid resistance is big, the power consumption is big.

(6) The medium flow direction nominal pressure Pn≤16mpa, generally uses the downstream, the medium from the disc under the direction high; the nominal pressure Pn≥20mpa, generally uses the countercurrent, the medium from the disc direction is dirty. To increase the sealing energy. When used, the cut-off valve media can only flow in one direction and cannot change the flow direction.

(7) The disc is often subjected to erosion when fully open.

The valve stem axis of the globe valve is perpendicular to the seating seal surface. The valve stem opening or closing stroke is relatively short, and has a very reliable cutting action, making this valve suitable as a medium for cutting or regulating and throttling use.