焊接閘閥的啟閉件是塞形的閥瓣，密封面呈平面或錐面，閥瓣沿流體的中心線(xiàn)作直線(xiàn)運(yùn)動(dòng)。閥桿的運(yùn)動(dòng)形式，有升降桿式（閥桿升降，手輪不升降），也有升降旋轉(zhuǎn)桿式（手輪與閥桿一起旋轉(zhuǎn)升降，螺母設(shè)在閥體上）。紋管截止閥只適用于全開(kāi)和全關(guān)，不允許作調(diào)節(jié)和節(jié)流。

對(duì)焊式電站閘閥優(yōu)點(diǎn)：

結(jié)構(gòu)簡(jiǎn)單，制造和維修比較方便。

工作行程小，啟閉時(shí)間短。

密封性好，密封面間摩擦力小，壽命較長(zhǎng)。

結(jié)構(gòu)簡(jiǎn)單，制造和維修比較方便。

工作行程小，啟閉時(shí)間短。

密封性好，密封面間摩擦力小，壽命較長(zhǎng)。

對(duì)焊式電站閘閥缺點(diǎn)：

流體阻力大，開(kāi)啟和關(guān)閉時(shí)所需力較大。

不適用于帶顆粒、粘度較大、易結(jié)焦的介質(zhì)。

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