美國凱斯通手柄式對夾蝶閥專業(yè)保障
對夾中線蝶閥主要由閥體、轉(zhuǎn)軸、閥板、閥座及驅(qū)動機構(gòu)(手柄、蝸輪蝸桿、氣動裝置或電動裝置)等組成,靠驅(qū)動機構(gòu)帶動轉(zhuǎn)軸及閥板旋轉(zhuǎn)以實現(xiàn)啟閉和控制流量的目的。對夾式蝶閥特點如下:
結(jié)構(gòu)簡單、小巧輕便,運輸、安裝、拆卸容易;90°啟閉,開關(guān)迅速。操作扭矩小,省力輕巧;密封性能好,使用壽命長,可達到零泄漏;選擇不同的零部件材質(zhì),可適用于多種介質(zhì);流量特性近似于直線,調(diào)節(jié)性能好。
美國凱斯通手柄式對夾蝶閥專業(yè)保障
Clip on butterfly valve mainly comprises a valve body, a rotating shaft, the valve plate and seat and a driving mechanism (handle, worm gear, pneumatic and electric device etc.), by the driving mechanism drives the rotating shaft and the valve plate opening and closing and rotation to achieve the purpose of flow control. The clip type butterfly valve features as follows:
The utility model has the advantages of simple structure, small size, portability, easy transportation, installation and disassembly, quick switching at 90 DEG and quick switching. The utility model has the advantages of small operation torque, labor saving, light weight, good sealing performance, long service life, zero leakage, different material selection of parts and components, and can be applied to a plurality of mediums; the flow characteristic is similar to the straight line, and the regulating performance is good.
橡膠密封蝶閥缺點是作節(jié)流使用時,由于使用不當(dāng)會產(chǎn)生氣蝕,使橡膠座剝落、損傷等情況發(fā)生。為此,現(xiàn)在上又開發(fā)金屬密封蝶閥,氣蝕區(qū)減小,近幾年我國也開發(fā)了金屬密封蝶閥,在日本近年來還開發(fā)耐氣蝕、低振動、低噪聲的梳齒形蝶閥。
一般密封座的壽命在正常情況下,橡膠15年-20年,金屬的80年-90年。但如何正確選用則要根據(jù)工況要求。
蝶閥的開度與流量之間的關(guān)系,基本上呈線性比例變化。如果用于控制流量,其流量特性與配管的流阻也有密切關(guān)系,如兩條管道安裝閥門口徑、形式等全相同,而管道損失系數(shù)不同,閥門的流量差別也會很大。