Regarding the problems of general manufacturers’ mechanical gas meters with negative flow at the big end, replacement of the meter for temperament replacement, the need to select a meter with corresponding flow specifications for the user’s flow, and low cost performance, Zhenlan gas meters have proposed the following solutions. Effective implementation: Regarding the problems of general manufacturer's mechanical gas meters with negative flow at the large end, replacement of temperament meters, selection of meters with corresponding flow specifications for user flow, and low performance-price ratio, Zhenlan gas meters propose the following solutions , And has been effectively implemented: Regarding the problems of general manufacturer’s mechanical gas meters with negative flow at the big end, the need to change the meter for temperament replacement, the need to select a meter with corresponding flow specifications for user flow, and the low performance-price ratio, Zhenlan gas meters proposed The following solutions have been effectively implemented: For general manufacturers’ mechanical gas meters at the big end, the flow rate is negative, the temperament replacement needs to be replaced, the meter with the corresponding flow specification needs to be selected for user flow, and the performance-price ratio is not high. The gas meter proposes the following solutions and has been effectively implemented: