The composition and function of the air compressor oil return check valve

The composition and function of the air compressor oil return check valve

The oil return check valve is composed of valve body, steel ball, steel ball seat, spring and other elements. The oil and gas mixture compressed by the main engine of the air compressor is initially separated in the oil and gas tank by centrifugal force. Since the weight of the oil is greater than that of air, most of the oil in the oil and gas mixture falls into the oil tank by centrifugal force. Then return to the main engine for a lubrication cycle under the action of internal pressure. The compressed air containing a small amount of oil is separated again by the oil-gas separator, and the lubricating oil separated by the oil-gas separator will fall to the bottom of the oil-gas separator. In order to prevent this part of the oil from being carried away with the compressed air, the unit is designed with an oil pipe inserted into the bottom of the oil-air separator, and through internal pressure, this part of the oil is directly introduced to the main engine for lubrication. There is a one-way valve on the oil pipe, and the screw air compressor is called an oil return single valve.

　　The function of the oil return check valve is to only allow the compressor air to enter the air storage tank, while the air in the air storage tank cannot return to the compressor. If the oil return check valve fails, the gas in the gas storage tank will be discharged through the pressure relief valve after the air compressor stops, causing the compressor to start repeatedly.