Apply flame to valve at base of socket. Heat uniformly, sweeping flame from valve to tube until flux on valve becomes quiet. Avoid excessive heating of valve.

• 在阀门的套筒底座用火焰进行烘烤。加热要均匀,用火焰对阀门及管道进行火焰烘烤的过程要延续到阀门上的焊剂不再发出声音。不要对阀门过度加热。