At present, most of the one-way valves for suction and discharge of metering pumps at home and abroad are ball valve structures, and the fundamental reason is that the use of ball valves can ensure good sealing.

1. The ball valve rotates continuously during movement

This is because: the ball valve constantly rotates during movement, and there is no suitable place on the spherical surface to adhere solid particles; The sealing surface of the ball valve is very small, only a circular line, which allows the ball valve to still ensure good sealing performance against accidentally mixed solid particle media. In addition, ball valves do not have guiding devices, thus avoiding unstable frictional forces that hinder movement and reducing valve hysteresis factors. At the same time, it also avoids deformation and sealing failure caused by the different thermal expansion coefficients of the valve and valve seat materials used in high-temperature media, and reduces the unstable working factors of the valve.

2. When the medium is a liquid with granular properties such as suspended medium, mud, abrasive, etc., the ball valve has greater flexibility.

3. Due to the continuous rotation of ball valves during movement, wear is not concentrated in one place, resulting in a long service life. Therefore, using ball valves in media has special advantages.