美國(guó)凱斯通手柄式對(duì)夾蝶閥專(zhuān)業(yè)保障
對(duì)夾中線(xiàn)蝶閥主要由閥體、轉(zhuǎn)軸、閥板、閥座及驅(qū)動(dòng)機(jī)構(gòu)(手柄、蝸輪蝸桿、氣動(dòng)裝置或電動(dòng)裝置)等組成,靠驅(qū)動(dòng)機(jī)構(gòu)帶動(dòng)轉(zhuǎn)軸及閥板旋轉(zhuǎn)以實(shí)現(xiàn)啟閉和控制流量的目的。對(duì)夾式蝶閥特點(diǎn)如下:
結(jié)構(gòu)簡(jiǎn)單、小巧輕便,運(yùn)輸、安裝、拆卸容易;90°啟閉,開(kāi)關(guān)迅速。操作扭矩小,省力輕巧;密封性能好,使用壽命長(zhǎng),可達(dá)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(xiàn),調(diào)節(jié)性能好。
美國(guó)凱斯通手柄式對(duì)夾蝶閥專(zhuān)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(diǎn)是作節(jié)流使用時(shí),由于使用不當(dāng)會(huì)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(kāi)發(fā)金屬密封蝶閥,氣蝕區(qū)減小,近幾年我國(guó)也開(kāi)發(fā)了金屬密封蝶閥,在日本近年來(lái)還開(kāi)發(fā)耐氣蝕、低振動(dòng)、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(kāi)度與流量之間的關(guān)系,基本上呈線(xiàn)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(mén)口徑、形式等全相同,而管道損失系數(shù)不同,閥門(mén)的流量差別也會(huì)很大。