Double Spiral Rotor Flow Meter

Double Spiral Rotator flow Meter is an advanced positive displacement flow meter with features of high measurement accuracy, smooth running, no pulsation, low noise, long service life, strong adaptability to various viscosities and without requirement to the upstream and downstream straight pipe length. It is widely used in many industries such as petroleum, chemical, metallurgy, thermal power, shipbuilding, and food etc. It is especially suitable for trading measurement for crude oil, highly condensed oil, crude oil with water, petroleum products, as well as engineering measurement. The flow meter can be equipped with photo-electric pulse converter or electronic flow transmitter to output pulse signal or analog current signal for remote monitoring in the control room.

Product Description

Principles of Measurement


The measuring chamber consists of interior case, Bi-Rotor and the top & bottom cover plates. This structure forms some volumetric-known cavities, which are the volume measuring unit of the flow meter. The pressure difference between the flow meter’s inlet and outlet (even if the tiny pressure difference) will drive the Bi-rotor to rotate, which continually transfer the liquid from the flow meter’s inlet to the outlet to implement volume flow measurement (see diagram Flow in -> Measuring -> Flow out ). The rotors’ rotating number will be transmitted to the counter by the sealed coupling and the driving system, so the total volume flow of the passing liquid can be indicated directly.


Main technical data
Size DN8 ~ 400
Accuracy 0.1%,  0.2%,  0.5%
Pressure loss < 80 Kpa ( 0 ~ 1000 cp),  < 150 Kpa (1000 ~ 20000 cp )
Pressure rating 1.6 Mpa,  2.5Mpa,  4.0Mpa,  6.3Mpa
Temperature range -20 ~ 80℃, 80 ~ 150℃, 150 ~ 250℃, -40 ~ 120℃
Medium viscosity 0 – 20000 cp
Ambient temperature -30 ~ 70℃
Process connection Flange
Pulse converter / Current converter Power supply: 12 ~ 24VDC, Explosion-proof: Exd II CT6, Weather-proof: IP65




Answer : Please send your question or enquiry to our email:, we will forward the questions to the related engineer.

Answer :  Please communicate with the sales about the return procedure before returning product.

Answer :  The delivery time depends on the order quantity and product specification.  If the product’s specification is conventional ( not special ),  delivery time is 5 or 7 working days for order quantity ≤ 10 pieces;  delivery time is 2 or 3 working weeks for order quantity 15 ~ 30 pieces. 

Answer :  by Courier,  by Sea or by Air

Answer :  Yes,  Generally warranty is one year.

Answer :  From year 2015  to year 2021,  average annual sales is RMB 350 million ( about USD 54.7 million )

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