進(jìn)口先導(dǎo)式電磁閥（Pilot solenoid valve）適用范圍于以蒸汽為加熱介質(zhì)，進(jìn)行溫度自動控制的執(zhí)行機(jī)構(gòu)?？蓪φ羝訜崞鳌⑸崞?、干燥器等蒸汽設(shè)備及各類溫度自控儀、蒸汽定型機(jī)、蒸染機(jī)、蒸汽回潮機(jī)等成套設(shè)備的鍋爐蒸汽管道進(jìn)行二位式自動控制和遠(yuǎn)程控制區(qū)。廣泛應(yīng)用于染化、紡織、印染、食品、醫(yī)藥、卷煙、水泥制品、石油化工、冶金等部門的自控系統(tǒng)。
進(jìn)口先導(dǎo)式電磁閥主要特點(diǎn)
耐熱：電磁部分、密封件部分用特種耐調(diào)溫電工材料和密封材料，并應(yīng)用了各種隔熱措施。
耐磨：選材合理，閥杯和導(dǎo)向套間巧妙地利用流體的潤滑作用，減少磨損
耐冷凝：蒸汽管道的冷凝水是影響蒸汽電磁閥動作的重要因素，本閥則不受冷凝水影響。
，Pilot solenoid valve，通電時，依靠電磁力提起閥桿，導(dǎo)閥口打開，此時電磁閥上腔通過先導(dǎo)孔卸壓，在主閥芯周圍形成上低下高的壓差，在壓力差的作用下，流體壓力推動主閥芯向上移動將主閥口打開；斷電時，在彈簧力和主閥芯重力的作用下，閥桿復(fù)位，電磁閥上腔壓力升高，流體壓力推動主閥芯向下移動，主閥口關(guān)閉。
德國托克（TOK）品牌：應(yīng)用范圍：
它廣泛應(yīng)用于航天、船舶重工、化工、鍋爐、采暖設(shè)備、干燥設(shè)備、食品醫(yī)療設(shè)備、清洗設(shè)備、等加溫管道系統(tǒng)中。
產(chǎn)品特點(diǎn)：
閥芯均為不銹鋼材料、活塞式結(jié)構(gòu)，活塞環(huán)用特殊耐溫、耐磨材料制作；活塞與金屬閥腔不產(chǎn)生直接摩擦，閥體安裝方向無限制；特制線圈，不易燒毀；長時間停止動作重新啟動，動作同樣靈敏。
主要技術(shù)參數(shù)：

工作原理：
常閉：當(dāng)線圈通電時，先導(dǎo)閥芯吸合，先導(dǎo)孔打開，閥上腔卸壓，活塞靠下腔介質(zhì)壓力推動，電磁閥打開；當(dāng)線圈斷電時，先導(dǎo)閥芯靠彈簧復(fù)位，先導(dǎo)孔關(guān)閉，閥上腔由活塞節(jié)流孔增壓和復(fù)位彈簧的推力，電磁閥關(guān)閉。
常開：當(dāng)線圈通電時，先導(dǎo)孔關(guān)閉，閥上腔由活塞節(jié)流孔增壓和復(fù)位彈簧的推力，電磁閥關(guān)閉。當(dāng)線圈斷電時，先導(dǎo)閥芯靠彈簧復(fù)位，先導(dǎo)孔打開，閥上腔卸壓，活塞靠下腔介質(zhì)壓力推動，電磁閥打開。
規(guī)格尺寸：

注：出口端壓力大于進(jìn)口端壓力，介質(zhì)會反向?qū)??？砂惭b止回閥或訂制自帶止回功能的閥。
Applications: 
It is widely used in aerospace, shipbuilding Heavy Industry, chemical industry, boiler, heating equipment, drying equipment, food and medical equipment, cleaning equipment, such as heating pipe system.
Features: 
Are all stainless steel valve, piston structure, piston ring with a special temperature, wear-resistant material; piston valve chamber with the metal does not have a direct friction, the valve mounting direction unlimited; special coil, not easy to burn; a long time to stop action Restart the action as sensitive.
Main technical parameters:

How it works: 
NC: When the coil is energized, the pilot spool pull the pilot hole to open, pressure relief valve on the chamber, the piston on the lower chamber medium pressure to promote, the electromagnetic valve is opened; When the coil power, the pilot valve by the spring return, pilot hole closed, the valve chamber and pressurized by the piston return spring throttle thrust, the electromagnetic valve is closed. 
Normally Open: When the coil is energized, the pilot hole closed, the valve chamber and pressurized by the piston return spring throttle thrust, the electromagnetic valve is closed. When the coil power, the pilot valve by the spring return, pilot hole open, pressure relief valve on the chamber, medium pressure piston push the lower chamber, the electromagnetic valve is opened.
Size:

Note: The outlet pressure is greater than the inlet pressure, the media will pass anti-wizard.Can be installed or custom built non-return valve function of the valve