A shut-off valve, also known as a shut-off valve, is a force sealed valve. Therefore, when the gate valve of Lianggong Valve Factory is closed, pressure must be applied to the valve disc to prevent protrusion leakage. When the medium enters the gate valve below the valve disc, the resistance that the operating force must overcome is the friction between the valve seat and the packing and the thrust generated by the medium pressure. The force to close the valve is greater than the force to open the valve, so the diameter of the valve seat should be larger; Otherwise, the valve seat will bend and fail. The stop valves of Lianggong Valve Factory are divided into three types of connection methods: flange connection, flange connection, and welding connection. After the appearance of a self sealing valve, the flow direction of the shut-off valve medium flows from above the valve disc to the valve chamber.

此時，在介質壓力的作用下，閥門關閉力小，閥門開啟力大，閥座直徑可以相應減小。同時，在介質的影響下，這種閘閥更加緊密。我們國家的閘閥曾經規定，截止閥的流向應該是上下的。當截止閥打開時，閥瓣的打開高度為公稱直徑的250%。流量已達到較大值，表明閘閥已達到全開位置。所以截止閥的全開位置必須由閥瓣的行程來確定。

At this point, under the action of medium pressure, the valve closing force is small, while the valve opening force is large, and the valve seat diameter can be correspondingly reduced. At the same time, under the influence of the medium, this type of gate valve is more compact. Our country's gate valve once stipulated that the flow direction of the stop valve should be up and down. When the shut-off valve is opened, the opening height of the valve disc is 250% of the nominal diameter. The flow rate has reached a high value, indicating that the gate valve has reached the fully open position. So the fully open position of the shut-off valve must be determined by the stroke of the valve disc.

良工閥門廠截止閥的開啟和關閉部分是一個塞狀閥瓣，密封頂部有一個平面或圓錐面，閥瓣沿閥座線直線移動。閥座運動模式(俗稱暗閥座)還有一種旋轉升降桿，可用于控制氣體、水、蒸汽、各種腐蝕性介質、油脂、油脂、液態金屬和放射性介質。因此，這種類型的截止閥非常適合關閉或調整和節流。由于良工閥門廠這種截止閥的閥座啟閉行程較短，截止功能非常可靠，而且由于閥座口的變化與閥瓣的行程成正比，非常適合設置流量。

The opening and closing part of the stop valve at Lianggong Valve Factory is a plug shaped valve disc, with a flat or conical surface at the top of the seal. The valve disc moves in a straight line along the centerline of the valve seat. The valve seat movement mode (commonly known as the dark valve seat) also has a rotating lifting rod that can be used to control gas, water, steam, various corrosive media, grease, grease, liquid metal, and radioactive media. Therefore, this type of globe valve is very suitable for closing or adjusting and throttling. Due to the short opening and closing stroke of the valve seat in Lianggong Valve Factory, the cut-off function is very reliable, and the change in the valve seat opening is proportional to the stroke of the valve disc, making it very suitable for setting the flow rate.

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