| 摘要 |
<p>A refrigeration system including a refrigerant flow reversing valve. The flow reversing valve includes a valve housing providing a chamber communicating with a refrigerant compressor discharge via a first port and a bearing surface with second, third and fourth ports opening into it, the second port communicating with the compressor inlet. A valving member is disposed on the surface for sliding movement to communicate, respectively, the first and fourth and second and third ports when in one position and to communicate, respectively, the first and third and second and fourth ports in a second position. The valving member is formed by a rigid plastic body defining a cavity by which the second port is communicated with the respective third and fourth ports and a face surrounding the cavity extending generally parallel to the bearing surface. A thin sheet of polytetrafluoroethylene is interposed between the valving body face and the bearing surface to enable low friction movement of the valving member between its positions. The sheet and valving body face are mechanically attached to each other.</p> |
