| 摘要 |
A rotary four-way reversing valve with low pressure drop and low leakage, comprising a valve body (1) and a valve core (2) arranged in the valve body (1) by means of a bearing. The valve body (1) comprises: a low-pressure exhaust pipe (S), a high-pressure air inlet pipe (D), a condensation pipe (C) and an evaporation pipe (E) that are arranged on the valve body (1). The valve core (2) is slantingly divided, by a U-shaped seal ring with a spring, into a high-pressure chamber (4) and a low-pressure chamber (5) that are not communicated with each other. The valve core (2) comprises: a through hole aligned with the high-pressure air inlet pipe (D) of the valve body and an opening aligned with the condensation pipe (C) or the evaporation pipe (E), the through hole and the opening being arranged in the high-pressure chamber (4); and an opening always aligned with the low-pressure exhaust pipe (S) and an opening aligned with the evaporation pipe (E) or the condensation pipe (C), the openings being arranged in the low-pressure chamber (5). By rotating the valve core (2) about 180 degrees, high-pressure air inlet of the high-pressure chamber (4) is changed from being aligned with the condensation pipe (C) to being aligned with the evaporation pipe (E), and low-pressure exhaust of the low-pressure chamber (5) is changed from being aligned with the evaporation pipe (E) to being aligned with the condensation pipe (C). By means of the four-way reversing valve, the loss in circulating pressure is low, there is almost no leakage in the valve, and reliable reversing is achieved. |
