進口閘閥按閥桿構(gòu)造的分類和結(jié)構(gòu)特點
按閥桿的構(gòu)造進口閘閥的分類 1） 明桿閘閥：閥桿螺母在閥蓋或支架上，開閉閘板時，用旋轉(zhuǎn)閥桿螺母來實現(xiàn)閥桿的升降。這種結(jié)構(gòu)對閥桿的潤滑有利，開閉程度明顯，因此被廣泛采用。 2） 暗桿閘閥：閥桿螺母在閥體內(nèi)，與介質(zhì)直接接觸。開閉閘板時，用旋轉(zhuǎn)閥桿來實現(xiàn)。這種結(jié)構(gòu)的優(yōu)點是：閘閥的高度總保持不變，因此安裝空間小，適用于大口徑或?qū)Π惭b空間受限制的閘閥。此種結(jié)構(gòu)要裝有開閉指示器，以指示開閉程度。這種結(jié)構(gòu)的缺點是：閥桿螺紋不僅無法潤滑，而且直接接受介質(zhì)侵蝕，容易損壞。美國威盾VTON品牌的進口閘閥的詳細產(chǎn)品有：進口日標閘閥、進口美標波紋管閘閥、進口低溫閘閥，進口氣動刀閘閥，進口刀閘閥，進口美標閘閥，進口鍛鋼閘閥，進口軟密封閘閥，進口保溫閘閥，進口不銹鋼閘閥。
Construct a gate valve by the valve stem 1） rising stem gate valve: the valve stem nut on the valve cover or bracket opening and closing the gate, with a rotating valve stem nut to stem the rise and fall. This structure is beneficial to the valve stem lubrication obvious degree of opening and closing, so widely used. 2） rising stem gate valve: direct contact with the stem nut in the valve body, and media. Opening and closing gate with a rotating stem. The advantage of this structure are: gate valve height remains unchanged, so the installation space, applicable to large diameter gate valve or restricted installation space. Such a structure should be equipped to open and close indicator to indicate the opening and closing degree. The disadvantage of this structure are: the stem threads not only can not be lubricated, but also directly accept the medium erosion, and easily damaged.
