Automatic pressure relief structure: when the pressure in the middle chamber rises abnormally, the medium in the middle chamber can automatically relieve the pressure by pushing the valve seat with its own thrust, thus ensuring the safety of valve lifting.

The liquid flow rate can be selected in the range of 1~10m/s at the full flow rate of EMF, and the range is relatively wide. In principle, the upper limit flow rate is unlimited, but it is generally recommended not to exceed 5m/s. Unless the lining material can withstand liquid flow erosion, it rarely exceeds 7m/s in practical application, and it is even more rare if it exceeds 10m/s. The lower limit of flow rate of full flow is generally 1m/s, and some models of instruments are 0.5m/s. For some pipeline systems with low flow or low flow rate at the initial stage of operation of new projects, from the perspective of measurement accuracy, the instrument diameter should be smaller than the pipe diameter and connected with a reducer.