This model of electromagnetic valve has the single - way check function and a patent design of block - up resisting and is the ideal self control valve for the water supply system with a high level container or tank or the automatic water supply system with a high level container or tank or the automatic water supply facility required the function of adverse current prevention , be applicable to the zero to press bad into the water system Fcd . 3 618a ：进水口与出水口均为4分15铜外螺纹自动清洗电器设备热水器园林喷灌红外感应洁具自动计收费供水系统等配套电控阀门，专利防堵塞设计，使其具有优秀防堵性能，适用于零压差进水系统。
Baby memory foam pad is especially designed for infant use . it bring baby 0 body ' s pressure , offset anti - momentum , provide even and powful support , keep baby ' s touching part long time 0 pressure state . it does not blog blood circulation and not easily get tired and painful . it can help to change the baby ' s pilch by moving the slide without carrying the baby up in arms . it can provide baby most comfortable feeling 慢回弹海绵床垫能有效把人体压力化解为零压，抵消反动力，为您提供最平均、真实的支撑，使身体长时间接触的部位处于无压力状态，不阻碍血液循环及不易产生疲劳和酸痛，因而减少睡眠不必要的翻身次数。
A zero - voltage starting method is brought forward which switch the starting from separate exciting to self - exciting successfully ; pll ( phase lock loop ) technology is employed to realize the frequency tracing and constant phase angle control ; igbt driving and protective circuit suitable for parallel inverter is developed , which successfully solve the problem of time compensating and overlapping regulation for the driving signals ; a novel and practical over - voltage protective method for parallel inverters is presented which effectively avoid the possible over - voltage destroy to the inverter . xu haiwen ( power electronics and electric driving ) directed by senior engineer peng yonglong 提出了一种零压启动的他激转自激方法；通过采用锁相环技术实现了逆变器工作频率的自动跟踪和容性逆变角度的恒值控制；设计了适用于并联谐振型逆变器的igbt驱动与保护电路，解决了驱动信号的时间补偿以及重叠角的可调问题；提出了一种新颖、实用的逆变器过压保护方法，有效地解决了并联型谐振逆变器过压保护这一难题。
Memory foam babe boat bed is especially designed for infant cradle . it bring baby 0 body ' s pressure , offset anti - momentum , provide even and powful support , keep baby ' s touching part long time 0 pressure state . it does not blog blood circulation and not easily get tired and painful . it can provide baby most comfortable feeling 慢回弹海绵床垫能有效把人体压力化解为零压，抵消反动力，为您提供最平均、真实的支撑，使身体长时间接触的部位处于无压力状态，不阻碍血液循环及不易产生疲劳和酸痛，因而减少睡眠不必要的翻身次数。
Memory foam back max can bring 0 human ' s pressure , offset anti - momentum , provide even and powful support , keep your touching part long time 0 pressure state . it does not blog blood circulation and not easily get tired and painful . so it can reduce the times of toss and turns during sleeping . it especially suits for those suffered from insomnia , neck stiff , neck - vertebra and pregnant women 慢回弹大躺椅能有效把人体压力化解为零压，抵消反动力，为您提供最平均、真实的支撑，使身体长时间接触的部位处于无压力状态，不阻碍血液循环及不易产生疲劳和酸痛，因而减少睡眠不必要的翻身次数。
