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DEFINITION   Key structure is made up of rotary carried helical blades which goes around as the same direction of water flow. CHARACTERS   1.Fit for big water flow.  2.Stable and high accuracy.  3.Low pressure loss.  4.Long working life.  5.Fit for hard water.  6.Types: horizontal, vertical and removable.  7.ALL technical figures are conformed with GB/T778.1~3-1996 which is equivalent to IS04064 Standard Class B.WORKING CONDITION:   .Water temperatured45(Hot water meterd90)  .Water pressured1Mpa     MAXIMUM PERMISSIBLE ERROR:   .From the minimum flow-rate (qmin) inclusive to the lower zone of the transitionalflow-rate (qt) exclusive: ±5% .  .From the transitional flow-rate (qt) inclusive to the higher zone of the maximumflow-rate (qmax) exclusive: ±2%(hot water meter±3%.)