美国Usaleo┃brand进口杠杆浮球式疏水阀┃
美国力沃LEO]进口杠杆浮球式是利用浮力原理和杠杆原理，通过液位的变化使浮球上升或下降，浮球驱动着杠杆使得阀瓣离开或接触阀座达到开启排水和关闭阻汽的作用。采用自动排空气阀，能自动排除不凝结气体，非常灵敏，工作质量高，使用寿命长。连续排水，有水即排，zui小过冷度为┃0℃。杠杆浮球式疏水阀采用两种结构方式┃A：单阀座-杠杆浮球;┃B：双平衡阀座-杠杆浮球。
单阀座：需要克服介质压力对阀座的作用，阀座的孔径不能很大，适用于小型设备、伴热管线，蒸汽主管等排水小的场合。阀座孔设计在凝结水水位以下，自然形成水封，水、汽自然分离，达到无蒸汽泄漏，即便没有凝结水采用球型密封的杠杆使得阀瓣紧贴阀座，达到无新鲜蒸汽的泄漏。不受凝结水量波动和温度的影响。
双平衡阀座：该阀利用双阀孔设计，介质的压力对两个阀座作用相等，方向相反，介质压力对阀座作用相抵消，阀芯在开阀时压力相对减少，从而获得超大排量。工作时浮球随阀腔内液体位的变化而上下浮动，带动杠杆打开或关闭阀座。由于阀座孔在凝结水水位以下，形成水封，水、汽自然分离，达到无蒸汽泄漏。不受压力、温度、冷凝水流量波动的影响。
┃Lever-ball┃float┃trap
The┃lever-ball┃float┃type┃trap┃employs┃the┃buoyancy┃and┃leverage┃principles:┃to┃make┃the┃ball┃float┃ascend┃or┃descend┃by┃the┃change┃in┃the┃liquid┃level┃and┃then┃the┃ball┃float┃drives┃the┃lever┃to┃make┃the┃valve┃disc┃depart┃from┃or┃touch┃the┃valve┃seat┃to┃realize┃drainage┃and┃close┃the┃block┃vapor.┃The┃product┃adopts┃the┃automatic┃air┃exhaust┃to┃automatically┃eliminate┃non-condensing┃air.┃It┃is┃very┃precise┃with┃high┃operating┃quality┃and┃long┃service┃life.┃It┃can┃discharge┃whenever┃there┃is┃any┃water,┃and┃its┃minimum┃subcooled┃temperature┃is┃0℃.┃The┃lever-┃ball┃float┃trap┃adopts┃two┃kinds┃of┃structure┃modes:┃A:┃Single┃valve┃seat-lever┃ball┃float;┃B:┃double┃balanced┃valve┃seat-lever┃ball┃float.┃
Single┃valve┃seat:┃it┃needs┃to┃overcome┃the┃operation┃on┃the┃valve┃seat┃by┃the┃medium┃pressure;┃the┃hole┃caliber┃of┃the┃valve┃seat┃cannot┃be┃too┃large┃and┃is┃applicable┃to┃such┃low┃displacement┃condition┃as┃mini-equipment,┃steam┃tracing┃pipeline┃and┃steam┃main┃pipe.┃The┃hole┃of┃the┃valve┃seat┃is┃designed┃beneath┃the┃water┃level┃of┃the┃condensate┃water┃to┃form┃water┃sealing┃to┃keep┃water┃apart┃from┃vapor,┃so┃as┃to┃prevent┃the┃leakage┃of┃the┃vapor.┃Though┃there┃is┃no┃condensate┃water┃that┃uses┃ball-type┃sealed┃lever┃to┃make┃the┃valve┃clack┃tightly┃adhesion┃to┃the┃valve┃seat,┃it┃can┃prevent┃the┃fresh┃vapor┃from┃leakage.┃Further,┃the┃product┃is┃free┃of┃the┃affect┃of┃the┃fluctuation┃of┃the┃condensate┃water’s┃quantity┃and┃temperature.
The┃double┃balanced┃valve┃seat:┃this┃valve┃is┃designed┃to┃have┃two┃valve┃openings.┃The┃pressure┃of┃the┃medium┃act┃against┃the┃two┃valve┃seats┃equally┃in┃reverse┃direction,┃so┃the┃pressure┃on┃the┃valve┃seat┃is┃offset,┃the┃valve┃core┃assumes┃relatively┃low┃pressure┃when┃the┃valve┃is┃open,┃in┃this┃way┃the┃overlarge┃displacement┃is┃obtained.┃During┃the┃operating┃process,┃the┃ball┃float┃floats┃with┃the┃change┃in┃liquid┃level┃of┃the┃valve┃cavity┃to┃make┃the┃lever┃open┃or┃close┃the┃valve┃seat.┃The┃hole┃of┃the┃valve┃seat┃is┃designed┃beneath┃the┃water┃level┃of┃the┃condensate┃water┃to┃form┃water┃sealing┃to┃keep┃water┃apart┃from┃vapor,┃so┃as┃to┃prevent┃the┃leakage┃of┃the┃vapor.┃Further,┃the┃product┃is┃free┃of┃the┃affect┃caused┃by┃the┃fluctuation┃of┃pressure,┃temperature┃and┃condensate’s┃flow