Advantages and disadvantages of shut-off valves

Advantages.
1 . The structure of globe valve is simpler than gate valve, and it is more convenient to manufacture and maintain.
2 . The sealing surface is not easy to wear and abrasion, good sealing, no relative sliding between the sealing surface of the valve flap and the valve body when opening and closing, so the wear and abrasion are not serious, good sealing performance, long service life.
3 . When opening and closing, the valve flap stroke is small, so the height of the globe valve is smaller than the gate valve, but the length of the structure is longer than the gate valve.
4 . Opening and closing torque is large, opening and closing more effort, opening and closing time is longer.
5 . Fluid resistance, because the valve body media channel is more tortuous, fluid resistance, power consumption.
6 . Media flow direction nominal pressure PN ≤ 16MPa, the general use of downstream, the media from the valve flap upward flow; nominal pressure PN ≥ 20MPa, the general use of countercurrent, the media from the valve flap downward flow. To increase the seal energy. When used, the shut-off valve media can only flow in one direction, can not change the direction of flow.
7 . When fully open, the valve is often eroded. The stem axis of the globe valve is perpendicular to the sealing surface of the valve seat. Stem opening or closing stroke is relatively short, and has a very reliable cut-off action, making this valve suitable for use as a medium cut-off or regulation and throttling.
Disadvantages.
1 . Large fluid resistance, open and close the force required.
2 . Not suitable for the media with particles, viscosity, easy to coking.
3 . Adjustment performance is poor.