The Micro-resistance ball type check valve's disc is a ball coated with rubber and dependant on the line pressure the ball can roll in the chute in the body to open or close the valve without any noise and water-hammering and with good sealing capability. The flow rate is much with little resisting force and little pressure loss. It can be installed vertically or horizontally and suitable for the pipe network systems of cold water, hot water, industrial and domestic water. It is installed at the exit of trash pump in order to avoid the refluence of the medium.