Metal tube rotor flowmeterA device that calculates flow by measuring the position of rotating components located within a DC pipeline. It is a type of variable area flowmeter, in which the gravity of a circular cross-section float is supported by liquid dynamics in a vertical conical tube that expands from bottom to top. The float can freely rise and fall inside the conical tube. Under the action of flow velocity and buoyancy, it moves up and down, and after balancing with the weight of the float, it is transmitted through magnetic coupling to indicate the flow rate on the dial. Generally divided into glass and metal rotor flow meters. Metal rotor flowmeter is the most commonly used in industry. For small diameter corrosive media, glass material is usually used. Due to the inherent fragility of glass material, rotor flowmeters made of precious metals such as all titanium are also used for key control points