截止閥是工業(yè)管道中另一類重要的截?cái)嚅y，其啟閉件為閥瓣（閥芯），閥瓣沿閥座中心線作直線運(yùn)動(dòng)，通過(guò)改變閥瓣與閥座之間的距離來(lái)控制流道的通斷。與閘閥的“閘門(mén)式”啟閉不同，截止閥更像一個(gè)上下移動(dòng)的“塞子”——閥瓣下降壓緊閥座時(shí)，管道被切斷；閥瓣上升離開(kāi)閥座時(shí)，管道被接通。

Globe valve is another important type of shut-off valve in industrial pipelines, with its opening and closing component being the valve disc (valve core). The valve disc moves in a straight line along the centerline of the valve seat, and controls the flow path by changing the distance between the valve disc and the valve seat. Unlike the "gate style" opening and closing of gate valves, globe valves are more like "plugs" that move up and down - when the valve disc is lowered and the valve seat is tightened, the pipeline is cut off; When the valve disc rises and leaves the valve seat, the pipeline is connected.

截止閥屬于強(qiáng)制密封式閥門(mén)。在閥門(mén)關(guān)閉時(shí)，建議依靠外力（手輪扭矩或執(zhí)行機(jī)構(gòu)推力）向閥瓣施加足夠的壓力，強(qiáng)制密封面緊密貼合，才能保證不泄漏。這一特性決定了截止閥在關(guān)閉狀態(tài)下具有非常可靠的密封性能。截止閥的另一個(gè)顯著特點(diǎn)是閥座通口的變化與閥瓣行程成正比關(guān)系——閥瓣提升得越高，流通面積就越大。因此，截止閥不僅可以用于截?cái)嘟橘|(zhì)，在對(duì)調(diào)節(jié)精度要求不高的場(chǎng)合也可用于流量調(diào)節(jié)。

Globe valves belong to forced sealing valves. When the valve is closed, sufficient pressure must be applied to the valve disc by external force (handwheel torque or actuator thrust) to force the sealing surface to fit tightly and ensure no leakage. This characteristic determines that the shut-off valve has very reliable sealing performance in the closed state. Another significant feature of globe valves is that the change in valve seat opening is directly proportional to the stroke of the valve disc - the higher the valve disc is raised, the larger the flow area. Therefore, globe valves can not only be used to cut off media, but also for flow regulation in situations where precision is not required.

截止閥在結(jié)構(gòu)上有一個(gè)重要的方向性要求。我國(guó)閥門(mén)標(biāo)準(zhǔn)規(guī)定，截止閥的介質(zhì)流向一律采用“低進(jìn)高出”——介質(zhì)從閥瓣下方進(jìn)入，從上方流出。這種流向設(shè)計(jì)有兩個(gè)好處：一是關(guān)閉時(shí)介質(zhì)壓力有助于閥瓣壓緊閥座，增強(qiáng)密封效果；二是開(kāi)啟時(shí)操作力較小。安裝時(shí)若方向裝反，不僅會(huì)增加操作力矩，還可能導(dǎo)致閥門(mén)無(wú)法嚴(yán)密關(guān)閉。因此，截止閥的閥體上通常鑄有流向箭頭標(biāo)識(shí)。

Globe valves have an important directional requirement in their structure. According to the valve standards in our country, the flow direction of the medium for globe valves is uniformly "low in, high out" - the medium enters from below the valve disc and flows out from above. This flow design has two benefits: first, when closed, the medium pressure helps the valve disc to press the valve seat tightly, enhancing the sealing effect; The second reason is that the operating force is relatively small when opening. If the direction is reversed during installation, it will not only increase the operating torque, but may also cause the valve to fail to close tightly. Therefore, the valve body of the globe valve is usually cast with flow arrow markings.

在結(jié)構(gòu)形式上，常見(jiàn)的截止閥有直通式、角式和直流式三種。直通式截止閥的進(jìn)出口在同一軸線上，流道呈“S”形，流阻較大但結(jié)構(gòu)緊湊；角式截止閥的進(jìn)出口成90°角，適用于管道轉(zhuǎn)彎處；直流式截止閥的流道接近直線，流阻較小。截止閥的閥桿直徑通常設(shè)計(jì)得較大，這是因?yàn)殛P(guān)閉時(shí)需要克服介質(zhì)壓力產(chǎn)生的推力，閥桿過(guò)細(xì)容易發(fā)生頂彎故障。

In terms of structural form, there are three common types of globe valves: straight through, angle, and DC. The inlet and outlet of the straight through globe valve are on the same axis, and the flow channel is in an "S" shape, with high flow resistance but compact structure; The inlet and outlet of the angle type globe valve form a 90 ° angle and are suitable for pipeline bends; The flow channel of the DC globe valve is close to a straight line with low flow resistance. The diameter of the valve stem of a globe valve is usually designed to be larger because it needs to overcome the thrust generated by the medium pressure when closing, and a thin valve stem is prone to top bending failure.

良工閥門(mén)生產(chǎn)的截止閥產(chǎn)品線十分豐富。J41H、J41Y、J41W系列國(guó)標(biāo)截止閥采用圓柱形閥瓣，密封面呈平面或錐面。J61Y型電站截止閥具有高溫高壓的特點(diǎn)，采用獨(dú)特的自密封設(shè)計(jì)——壓力越高，密封越可靠。良工截止閥的閥桿經(jīng)調(diào)質(zhì)及表面氮化處理，具有良好的抗腐蝕性、抗擦傷性和耐磨性。產(chǎn)品覆蓋手動(dòng)、電動(dòng)、氣動(dòng)等多種驅(qū)動(dòng)方式，可滿足不同工況的使用需求。

Lianggong Valve has a very rich product line of globe valves. The J41H, J41Y, and J41W series national standard globe valves use cylindrical valve discs with a flat or conical sealing surface. The J61Y type power station globe valve has the characteristics of high temperature and high pressure, and adopts a unique self sealing design - the higher the pressure, the more reliable the seal. The valve stem of Lianggong globe valve has undergone quenching and surface nitriding treatment, and has good corrosion resistance, abrasion resistance, and wear resistance. The product covers various driving modes such as manual, electric, and pneumatic, which can meet the needs of different working conditions.

截止閥的主要優(yōu)點(diǎn)是結(jié)構(gòu)簡(jiǎn)單、制造和維修方便、密封可靠。缺點(diǎn)是流體阻力較大——由于流道在閥體內(nèi)多次改變方向，截止閥的流阻系數(shù)遠(yuǎn)高于閘閥。此外，截止閥的體形和重量也相對(duì)較大。因此，截止閥更適用于對(duì)密封性要求高、但對(duì)流阻不敏感的小口徑管道系統(tǒng)，一般口徑在DN200以下使用較為普遍。

The main advantages of globe valves are simple structure, easy manufacturing and maintenance, and reliable sealing. The disadvantage is that the fluid resistance is relatively high - due to multiple changes in the direction of the flow channel inside the valve body, the flow resistance coefficient of the globe valve is much higher than that of the gate valve. In addition, the shape and weight of the globe valve are relatively large. Therefore, globe valves are more suitable for small-diameter pipeline systems that require high sealing but are not sensitive to flow resistance, and are generally used for diameters below DN200.

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