A by-pass capillary tube was added on the discharge pipe behind the four-way valve and a tube was added in an accumulator in a heat pump system to solve the problem.
在热泵系统四通换向阀后的排气管上加旁通毛细管和在气液分离器中加过冷管。
2
Three-way or four-way round pipe welding is a common technique in practice.