Rotary four-way reversing valve with low pressure drop and low leakage

A rotary four-way reversing valve with low pressure drop and low leakage, comprising a valve body (1) and a valve core assembly (2) capable of switching between a first stop position and a second stop position in the valve body (1) by rotation, a high-pressure air inlet tube (D), an evaporating tube (E), a condenser tube (C) and a low-pressure exhaust tube (S) communicated with the valve body (1) through openings arranged on the valve body (1), wherein the valve core assembly (2) is coaxially assembled in the valve body (1) through bearings;

• wherein when the valve core assembly (2) is rotated to the first stop position, the high-pressure air inlet tube (D) is communicated with the condenser tube (C) through a first channel, which is slant relative to an axis of the valve core assembly (2), and the evaporating tube (E) is communicated with the low-pressure exhaust tube (S) through a second channel;
• and
• wherein when the valve core assembly (2) is rotated to the second stop position, the high-pressure air inlet tube (D) is communicated with the evaporating tube (E) through the first channel (4), and the condenser tube (C) is communicated with the low-pressure exhaust tube (S) through the second channel;
• wherein a gap is formed between an outer circumference of the valve core assembly (2) and an inner wall of the valve body (1), a seal structure (3) is slantly arranged on the outer circumference of the valve core assembly (2) relative to the axis of the valve core assembly (2), and an outermost edge of the seal structure (3) is in tight fit with the inner wall of the valve body (1), the gap formed between the valve body (1) and the valve core assembly (2) is divided by the seal structure (3) into a high pressure chamber (4) and a low pressure chamber (5) that are mutually independent, wherein the seal structure (3) is capable of moving with the valve core assembly (2) when the valve core assembly (2) is rotated between the first stop position and the second stop position, the seal structure (3) is slantly arranged on the outer circumference of the valve core assembly (2) relative to the axis of the valve core assembly (2) with a predefine angle such that when the valve core assembly (2) is rotated to either the first stop position or the second stop position, the first channel is always located in the high pressure chamber (4), and the second channel is always located in the low pressure chamber (5).