How to resolve the issue of flowmeter indicating full scale when the valve is fully closed

The metal tube float flowmeter has a simple structure, reliable operation, high accuracy, and a wide range of applications. Compared with glass rotor flowmeters, it can withstand higher pressures. The NYLZ-L series flowmeters include on-site indication, electrical remote transmission, limit switch alarms, corrosion resistance, jacketed type, damping type, explosion-proof, and other varieties. They are widely used in the measurement and automatic control of liquid and gas flow in departments such as national defense, chemical industry, petroleum, metallurgy, power, environmental protection, pharmaceuticals, and light industry. When the fluid flows from bottom to top through the upright measuring tube, the float rises under the action of pressure difference, and the height of the float's rise represents the flow rate. This information is transmitted to the indicator by the magnetic steel in the float coupled with the magnetic steel in the indicator, driving the pointer in the indicator to rotate.