REXROTH截止閥4WE6D6X/OFEW230N9DLB12

力士樂截止閥：截止閥閥桿的螺紋在閥體內(nèi)。這種結(jié)構(gòu)閥桿螺紋與介質(zhì)接觸，易受侵蝕，并無法潤滑。此種結(jié)構(gòu)用于小口徑和溫度不高的地方。國內(nèi)生產(chǎn)截止閥的比較多，連接尺寸也大多不。主要分以下幾個(gè)大類：以JB／T2203－1999《截止閥結(jié)構(gòu)長度》為主的通用類。目前國內(nèi)大多數(shù)安全閥生產(chǎn)均按本標(biāo)準(zhǔn)設(shè)計(jì)生產(chǎn)。但本標(biāo)準(zhǔn)也不盡*，規(guī)格不全，單閘板截止閥zui大公稱通徑為DN1200，雙閘板截止閥zui大公稱通徑 DN1500。根據(jù)廠所生產(chǎn)的截止閥規(guī)格及掌握的資料來看，目前角式截止閥公稱通徑zui小為DN15，Z型直通式截止閥公稱通徑達(dá)到DN2000。經(jīng)考證，各連接尺寸也不盡，為了有一個(gè)的標(biāo)準(zhǔn)，用戶在選用及安裝時(shí)同一規(guī)格能夠互，建議中國通用機(jī)械研究所對(duì)JB／T2203－1999《截止閥結(jié)構(gòu)長度》進(jìn)行修訂。建議設(shè)計(jì)院及用戶按標(biāo)準(zhǔn)選用，截止閥生產(chǎn)按標(biāo)準(zhǔn)設(shè)計(jì)制造。

REXROTH截止閥是指關(guān)閉件（閥瓣）沿閥座中心線移動(dòng)的閥門。根據(jù)閥瓣的這種移動(dòng)形式，閥座通口的變化是與閥瓣行程成正比例關(guān)系。由于該類閥門的閥桿開啟或關(guān)閉行程相對(duì)較短，而且具有非?？煽康那袛喙δ?，又由于閥座通口的變化與閥瓣的行程成正比例關(guān)系，非常適合于對(duì)流量的調(diào)節(jié)。因此，這種類型的閥門非常適合作為切斷或調(diào)節(jié)以及節(jié)流使用。
 其選用原則是：
 1、高溫、高壓介質(zhì)的管路或裝置上宜選用截止閥。如火電廠、核電站，石油化工系統(tǒng)的高溫、高壓管路上。
 2、管路上對(duì)流阻要求不嚴(yán)的管路上。即對(duì)壓力損失考慮不大的地方。
 3、小型閥門可選用針閥、儀表閥、取樣閥、壓力計(jì)閥等。
 4、有流量調(diào)節(jié)或壓力調(diào)節(jié)，但對(duì)調(diào)節(jié)精度要求不高，而且管路直徑又比較小，如公稱通經(jīng)≤50mm 的管路上，宜選用。
 5、合成工業(yè)生產(chǎn)中的小化肥和大化肥宜選用公稱壓力PN160 公稱壓力16MPa 或PN320 公稱壓力32MPa 的高壓角式截止閥或高壓角式節(jié)流閥。
 6、氧化鋁拜耳法生產(chǎn)中的脫硅車間、易結(jié)焦的管路上，易選用閥體分開式、閥座可去的、硬質(zhì)合金密封副的直流式截止閥或直流式節(jié)流閥。
 7、城建設(shè)中的供水、供熱工程上，公稱通經(jīng)較小的管路，可選用截止、平衡閥或柱塞閥，如公稱通經(jīng)小于150mm的管路上。zui明顯的優(yōu)點(diǎn)是： 在開啟和關(guān)閉過程中，由于閥瓣于閥體密封面間的摩擦力比閘閥小，因而耐磨。 開啟高度一般僅為閥座通道直徑的1/4，因此比閘閥小的多。 通常在閥體和閥瓣上只有一個(gè)密封面，因而制造工藝性比較好，便于維修。 公稱壓力或壓力級(jí)：PN1.0-16.0MPa、ANSI CLASS 150-900、JIS10-20K 公稱通徑或口徑：DN10～500、NPS 1/2 ～36" 連接方式：法蘭、對(duì)焊、螺紋等適用溫度：-196℃～700℃ 驅(qū)動(dòng)方式：、氣動(dòng)、電動(dòng)、液動(dòng)、氣液聯(lián)動(dòng)、閥體材料：WCB、ZG1Cr18Ni9Ti、ZG1Cr18Ni12Mo2Ti、CF8（304）、CF3（304L）、CF8M（316）、CF3M（316L）、Ti。選用不同的材質(zhì)，可分別適用于水、蒸汽、油品、硝酸、醋酸、氧化性介質(zhì)、尿素等多種介質(zhì)。

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