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ouword{var newwords;newwords = unescapewords;document.writenewwords;} ouword; 自力式流量調節(jié)閥在各種工業(yè)設備中用來自動調節(jié)流量,使之維持在一定的水平上?;蛴脕碜詣酉拗乒I(yè)設備中流體的流量,使之保持在一定的限值內。按流量檢測元件不同可分為文丘利式、孔板式、靶式三種。 1、直接作用式流量調節(jié)閥 調節(jié)閥由文丘利管、調節(jié)閥座、秤桿與平衡錘等組成。文丘利管由收斂管、喉管及放大管所組成,位于調節(jié)閥之后端,另一端以法蘭與管道相連接,流體流過文丘利管時即產生壓差。調節(jié)閥座為調節(jié)器之主體,底部裝有像膠薄膜,橡膠薄膜上連有調節(jié)閥的閥桿,閥桿上裝有閥芯,用心調節(jié)流量的大小。閥桿上還連接有秤桿與平衡錘,以與橡膠薄膜所受之壓差相平衡,平衡錘則用以調整給定流量。 調節(jié)閥以法蘭直接連接于被控制流量的管道中。當流體流過文丘利管時產生的壓差,推動調節(jié)閥座底部之像膠薄膜,從而傳動調節(jié)閥的閥桿,使閥門移動,以保持流體流量恒定。 當流量大時,通過文丘利管時產生的壓差也大,作用在調節(jié)閥座底部像膠薄膜兩面上的壓差也大,使閥門關小,流量就減小,反之,當流量小時,閥門就開大,流量增加,因而使流量保持恒定。 2、可變孔板自力式流量調節(jié)閥 用可變孔板產生壓差而保持流量恒定的自力式流量調節(jié)閥,其由可變孔板1、調節(jié)閥座2、活塞執(zhí)行機構3、整定彈簧4和手輪5等組成。可變孔板位于調節(jié)閥座之后端,另一端以法蘭與管道相連接,流體流過孔板時即產生壓差。調節(jié)機構為雙座結構的調節(jié)閥,是調節(jié)閥之主體。閥芯之一端用閥桿和活塞式執(zhí)行機構相連。整定彈簧用以和活塞上下之壓差相平衡,手輪則用以調整整定彈簧的彈力,以使介質流量在一定的范圍內。 調節(jié)閥以法蘭直接連接于被控制流量的管道中。當流體流過孔板時產生的壓差,分別作用在活塞上下端,活塞的移動通過活塞桿而帶動閥芯,使流過調節(jié)機構的流體流量發(fā)生變化,以保持流體流量之恒定。 當流量大時,通過孔板時產生的壓差也大,作用在活塞式執(zhí)行機構活塞上的壓差也大,使閥門關小,流量就減小。反之,當流量小時,閥門就開大,流量增加,因而使流量保持恒定。 3、zzl型自力式流量調節(jié)閥 這是一種利用流體的動力學原理來工作的指揮器操作型流量調節(jié)閥。調節(jié)閥由靶式流量檢測器1、輸入針閥2、過濾器3、指揮器4、主閥5和輸出針閥6等組成,并由紫銅管或不銹鋼管制作的信號管道連成一體。除了靶式流量檢測器外,其余的部分和組裝式指揮器操作型壓力調節(jié)器一樣。流體流過位于調節(jié)器前端的靶式流量檢測器時,由于流體的動力學原理,對靶產生沖擊力,通過杠桿傳遞給指揮器,此力和指揮器給定彈簧的彈力相比較,從而使指揮器的輸出發(fā)生變化,操縱主閥使主閥的閥芯相對閥座的位置發(fā)生變化,而保持流體的流量恒定。 當流體流量由于負荷變更式是上一環(huán)節(jié)的原因,使流量增大時,作用在靶式流量檢測器靶上的沖擊力也增大,通過杠桿傳到指揮器上的力(向右)大于指揮器給定彈簧向左的力,此時,指揮器活動組件向右移動,擋板靠近噴嘴,指揮器輸出減小,所以通往主閥上膜腔的壓力也隨之降低,由于上下膜腔的力平衡關系被破壞,主閥閥芯在主閥彈簧的作用下隨之上移,減小了主閥的流通面積,通過主閥的流量減小,直到此流量作用在靶上的沖擊力與指揮器給定彈簧的給定力相對應時為止。反之,當流量減小時,調節(jié)器向相反方向動作,直到流量增大至所需的恒定值為止 |