Be sure that valve is fully open . apply heat to tube first . transfer as much heat as possible through tube into valve . avoid prolonged heating of valve itself 要确保阀门处于开启状态。先对管道加热。尽可能多的将热从管道传递到阀门。避免延长阀门本身的加热时间。
2.
Be sure that valve is fully open . apply heat to tube first . transfer as much heat as pos * * * le through tube into valve . avoid prolonged heating of valve itself 要确保阀门处于开启状态。先对管道加热。尽可能多的将热从管道传递到阀门。避免延长阀门本身的加热时间。
