Definiton:
Key structure is made up of rotary carried helical blades which goes around as the same direction of water flow.

Characters:
1.Types: clock hands and numberical rolls (E type)
2.For dry type cold water
3.Simple structure
4.Big flow capable, low head loss
5.All technical figures are conformed with GB/T778.1-3-1996 which is to equivalent to ISO4064 Standard

WORKING CONDITION:
.Water temperature≤45℃(Hot water meter≤90℃)
.Water pressure≤1Mpa

MAXIMUM PERMISSIBLE ERROR:
.From the minimum flow-rate (qmin) inclusive to the lower zone of the transitional flow-rate (qt) exclusive: ±5% .
.From the transitional flow-rate (qt) inclusive to the higher zone of the maximum flow-rate (qmax) exclusive: ±2%(hot water meter±3%.)