Do I need a valve before and after the flow meter?
Yes, of course. Generally, the valve is conveniently and safely attached to the flowmeter.
If the metering system needs to work during the maintenance, replacement or calibration period, a bypass valve shall be installed and a valve shall also be set to close the valve when the metering device is operating.
Metering devices must be installed before and after the valve, the main role is to facilitate the measurement of device maintenance, replacement, calibration.
That does not necessarily, mainly consider whether the maintenance of maintenance after the need for valves, and that is, if the turbine flowmeter, flow in front of the best straight tube section as long as possible, to prevent the generation of eddy currents, affecting the measurement
