An oil inlet of a three-position four-way reversing solenoid valve (12) is connected to the oil inlet pipeline.

An exit end of the inlet piping is closed or has a gap.

An oil inlet pipeline (16) is connected to the rest of the ports of the T-connector.

The inlet pipe joint (2) comprises a deformable first pipe section (10), arranged to absorb thermal and mechanical loading in both axial and radial directions, and at least one further, second pipe section (2a, 2b).

A gas-liquid separator adapted for handling gas-liquid mixture flow, in which inlet piping and outlet piping are installed on a container in order to improve separation efficiency of the separator.

A lateral hole having a width greater than the diameter of the inlet piping is formed in a side face of the expanded end section.

The gas-liquid separator includes an expanded end section having a width greater than the diameter of that portion of the inlet piping which crosses the container of the gas-liquid separator.

An input piping system (108, 208) is coupled to the wet heat sinks (110, 232) and configured to supply cooling fluid to each of the wet heat sinks (110, 232).