(6)介质流动方向公称压力PN≤16MPa时，一般采用顺流，介质从阀瓣下方向上流；公称压力PN≥20MPa时，一般采用逆流，介质从阀瓣上方向下流．以增加密封件能。使用时，截止阀介质只能单方向流动，不能改变流动方向。
Characteristic
(1) the structure of the cut-off valve is simpler than that of the gate valve, and the manufacture and maintenance are more convenient.
(2) the sealing surface is not easy to wear and scrape, good sealing, when opening and closing, there is no relative sliding between the valve and the sealing surface of the valve body, so the abrasion and abrasion are not serious, the sealing performance is good, and the service life is long.
(3) when opening and closing, the valve stroke is small, so the cut-off valve height is smaller than the gate valve, but the structure length is lo
nger than the gate valve.
(4) the opening and closing moment is big and the opening and closing are more strenuous.
(5) large fluid resistance, due to the valve in the medium channel is tortuous, large fluid resistance, power consumption.
(6) the flow direction of medium nominal pressure PN is less than or equal to 16MPa, commo
nly used downstream, medium from the valve under the direction of flow; nominal pressure PN = 20MPa, using reflux, medium from the valve on the downstream direction to increase the seal. When used, the cut-off valve medium can o
nly flow in one direction, can not change the direction of flow.
(7) when fully open, the disc is always subject to erosion.
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