截止閥又稱球形閥，屬于強(qiáng)制密封式閥門，所以在閥門關(guān)閉時(shí)，必須向閥瓣施加壓力，以強(qiáng)制密封面不泄漏。當(dāng)介質(zhì)由閥瓣下方進(jìn)入閥門時(shí)，操作力所需要克服的阻力，是閥桿和填料的摩擦力與由介質(zhì)的壓力所產(chǎn)生的推力，關(guān)閥門的力比開閥門的力大，所以閥桿的直徑要大，否則會(huì)發(fā)生閥桿頂彎的故障。按連接方式分為三種：法蘭連接、絲扣連接、焊接連接。
The globe valve, also known as the globe valve, is a forced sealing valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters the valve from the lower part of the valve disc, the resistance to be overcome by the operating force is the friction between the valve rod and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the diameter of the valve rod is larger, otherwise the valve rod will be bent. There are three types of connection: flange connection, screw connection and welding connection.

近幾年來(lái)，從自密封的閥門出現(xiàn)后，截止閥的介質(zhì)流向就改由閥瓣上方進(jìn)入閥腔，這時(shí)在介質(zhì)壓力作用下，關(guān)閥門的力小，而開閥門的力大，閥桿的直徑可以相應(yīng)地減少。同時(shí)，在介質(zhì)作用下，這種形式的閥門也較嚴(yán)密。我國(guó)閥門“三化給”曾規(guī)定，截止閥的流向，一律采用自上而下。本閥要水平安裝截止閥開啟時(shí)，閥瓣的開啟高度，為公稱直徑的25%～30%時(shí).流量已達(dá)到**大，表示閥門已達(dá)全開位置。所以截止閥的全開位置，應(yīng)由閥瓣的行程來(lái)決定。
In recent years, since the emergence of self-sealing valves, the medium flow direction of the stop valve has changed from the top of the valve disc to the valve chamber. At this time, under the medium pressure, the force to close the valve is small, while the force to open the valve is large, and the diameter of the valve rod can be reduced accordingly. At the same time, under the action of medium, this type of valve is also relatively tight. Our country's "three chemical supply" has stipulated that the flow direction of stop valves should be from top to bottom. When the valve is to be installed horizontally, the opening height of the valve disc is 25%~30% of the nominal diameter. When the flow has reached * *, it means that the valve has reached the fully open position. Therefore, the full open position of the stop valve should be determined by the stroke of the valve disc.
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