A shut-off valve, also known as a shut-off valve, is a force sealed valve, so when the valve is closed, pressure must be applied to the valve disc to prevent leakage of the sealing surface. The manufacturer of Lianggong valve tells you that when the medium enters the valve below the valve disc, the resistance that the operating force must overcome is the friction between the valve stem 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 stem should be larger; Otherwise, the valve stem will bend and fail.

良工閥門廠家告訴你截止閥按連接方式分為三種:法蘭連接、螺紋連接和焊接連接。自密封閥出現后，截止閥介質的流向從閥瓣上方流向閥腔。此時，在介質壓力的作用下，閥門關閉力小，閥門開啟力大，閥桿直徑可以相應減小。同時，在介質的作用下，這種閥門更加緊密。

The manufacturer of Lianggong Valve tells you that stop valves can be divided into three types of connection: flange connection, threaded 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. At this point, under the action of medium pressure, the closing force of the valve is small, while the opening force of the valve is large, and the diameter of the valve stem can be correspondingly reduced. At the same time, under the action of the medium, this type of valve becomes tighter.

我們國家的閥門曾規定，截止閥的流向應該是自上而下的。當截止閥打開時，閥瓣的開啟高度為公稱直徑的250%。流量已達到較大值，表明閥門已達到全開位置。所以，截止閥的全開位置必須由閥瓣的行程決定。良工閥門廠家告訴你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。閥桿運動模式(俗稱暗閥桿)還有一種旋轉升降桿，可用于控制空氣、水、蒸汽、各種腐蝕性介質、油泥、油、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約流量。

Our country's valves have stipulated that the flow direction of the shut-off valve should be from top to bottom. 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 large value, indicating that the valve has reached the fully open position. Therefore, the fully open position of the shut-off valve must be determined by the stroke of the valve disc. The manufacturer of Lianggong Valve tells you that the opening and closing parts of the globe valve are a plug shaped disc, with a flat or conical surface at the top of the seal, and the disc moves in a straight line along the centerline of the valve seat. The valve stem movement mode (commonly known as the dark valve stem) also has a rotating lifting rod that can be used to control air, water, steam, various corrosive media, sludge, oil, liquid metal, and radioactive media. Therefore, this type of globe valve is very suitable for closing or adjusting and saving flow.

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