直通單座調(diào)節(jié)閥產(chǎn)品介紹：
直通單座調(diào)節(jié)閥由閥體、閥座、閥芯、導(dǎo)向套、閥蓋、閥桿和填料等零件組成。閥芯和閥桿連接在一起。直通單座調(diào)節(jié)閥的連接方法可用過(guò)盈配合銷釘固定或螺紋連接銷釘固定，也可以閥桿和閥芯一體車出。在閥蓋和閥體間設(shè)有導(dǎo)向套，為閥芯上下移動(dòng)起導(dǎo)向作用。導(dǎo)向套上的小孔，連通閥體內(nèi)腔和閥出口端。導(dǎo)向套上腔的介質(zhì)很容易通過(guò)小孔流入閥出口端，不會(huì)影響閥芯的移動(dòng)。
直通單座調(diào)節(jié)閥應(yīng)用范圍：
直通單座調(diào)節(jié)閥適用于泄漏要求較嚴(yán)、壓差不大的干凈介質(zhì)場(chǎng)合。
直通單座調(diào)節(jié)閥結(jié)構(gòu)特點(diǎn)：
直通單座調(diào)節(jié)閥的閥體內(nèi)只有一個(gè)閥芯和一個(gè)閥座。特點(diǎn)是泄漏量小，易于保證密封。結(jié)構(gòu)上有調(diào)節(jié)型直通單座調(diào)節(jié)閥和切斷型直通單座調(diào)節(jié)閥。調(diào)節(jié)型和切斷型的區(qū)別在于閥芯的形狀不同。調(diào)節(jié)型閥芯的形狀為柱塞形；切斷型閥芯的形狀為平板形或錐形，切斷型的另一個(gè)特點(diǎn)是介質(zhì)對(duì)閥芯的作用力大，即不平衡力大，特別是在高壓差、大口徑的情況下更為嚴(yán)重，所以僅適用于低壓差的場(chǎng)合。否則應(yīng)適當(dāng)選擇推力大的執(zhí)行機(jī)構(gòu)，或配以閥門定位器。
直通單座調(diào)節(jié)閥的閥芯有正裝和反裝兩種類型。當(dāng)閥芯向下移動(dòng)時(shí)，閥芯與閥座間流通面積減小，稱為正裝；反之則稱為反裝。調(diào)節(jié)閥的公稱尺寸DN和閥座直徑dN標(biāo)志著閥門的大小。對(duì)于公稱尺寸DN<2.5mm的單導(dǎo)向閥芯，只能正裝不能反裝。因此氣開式必須采用反作用執(zhí)行機(jī)構(gòu)。氣開式調(diào)節(jié)閥隨信號(hào)壓力的增大而流通面積也增大；而氣關(guān)式則相反，隨信號(hào)壓力的增大而流通面積減小。
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