1. The structure is simpler than the gate valve, and the manufacturing and maintenance are more convenient.

2. The sealing surface is not easy to wear and scratch, and has good sealing performance. There is no relative sliding between the valve flap and the valve body sealing surface when opening and closing, so the wear and scratch are not serious, the sealing performance is good, and the service life is long.

3. When opening and closing, the valve disc travel is small, so the height of the stop valve is smaller than that of the gate valve, but the structure length is longer than that of the gate valve.

4. The opening and closing torque is large, and the opening and closing are laborious. The opening and closing time is the principal.

5. The fluid resistance is large, because the medium channel in the valve body is tortuous, the fluid resistance is large, and the power consumption is large.

6. When the nominal pressure of the medium flow direction PN≤16MPa, the medium generally flows in the downstream direction, and the medium flows upward from the lower direction of the valve clack; When the nominal pressure PN≥20MPa, the reverse flow is generally adopted, and the medium flows down from the upper direction of the valve clack to increase the sealing element energy. When in use, the medium of the stop valve can only flow in one direction and cannot change the flow direction.

7. The valve disc is often eroded when it is fully opened.