FFM61 Series V-cone flowmeter is a product developed
by Floworld Company (U.S.) in 1980s. The product marks a leap in
the field of differential pressure flow measurement. The flowmeter
measures the pressure difference between upstream and downstream
by means of the throttle effect generated by V cone in flow field.
Compared with the common throttle sets, it transforms the throttle
pattern by changing central hole throttle to circular one. The practice
has born out that as compared with other flowmeters, V cone flowmeter
enjoys the advantages such as long-term high precision, good stability,
little limitation on installation, strong resistance to wear, wide
measurement range, small damage due to the pressing and adaptation
to the dirty media. In addition, V cone itself serves as rectifier
in the flow field and thus becomes a unique and superior new-type
flowmeter. The V cone flowmeter composed of V-cone sensor and differential
pressure transmitter can accurately measure the flows of media within
the range of Reynolds number (8×103≤Re≤5×107).
Main technical parameters of FFM61 V-cone
flowmeter：
Precision grade: 0.5 (the precision of differential pressure flow
transmitter shall be graded at no less than 0.2. ); （β：0.45～0.85，when
β<0.55 and the ratio of range is 4∶1，precision grade：≤0.30）
Repeatability: 0.1%
Working pressure: 0～40MPa（several pressure grades available）
Working temperature: -40～850°C
Ambient temperature: -40～65°C
Requirements on straight tube installation: straight tube 0-3D
in the front and straight tube 0-1D in the rear.
The ratio of range: 10:1 (usually); the optional appropriate parameter：50：1
Small damage due to the pressing: the damage is 1/3～1/5 that of
the pore plate when the value of β remains the same.
Caliber: DN25～DN2000
Technical parameters of FFM61 V-cone flowmeter：
1、Low requirements on installation: straight tube 0-3D in the
front and straight tube 0-1D in the rear
2、Ratio of range: 10:1 (usually); the maximal proper parameter:
50:1
3、Small damage due to the pressing: the damage is 1/3～1/5 that
of the pore plate when the value of β remains the same.
4、Strong resistance against wear: After the streamline V cone
is throttled, the vacuum effect will be generated on the surface
of V cone to keep the V cone from being worn easily.
5、Being free from blockage and adhesion: the complete purging
design of V cone avoids the settlement of residue, coagulation
or particle.
6、Long-standing favorable stability: the value of β can remain
the same for long and the accurateness in measurement can be ensured
for a long period.
7、High precision: 0.5 grade
8、Good repeatability: more than 0.1%
9、Stable signal: singular fluctuation is 1/10 of that of pore
plate;
10、Wide range of the value of β: the unique geometrical shape
of V cone flow sensor allows wide range of the value of β;
11、Wide range of caliber: DN25～DN2000;
12、The ability to measure high temperature and high-pressure medium:
maximal working temperature: 850℃; maximal pressure: 40MPa
13、The ability to measure the dirty medium (coke-oven gas, blast
furnace gas, feed stock and residual oil)
14、The ability to measure gas and liquid two-phase medium (moisture
and condensed water)
1、Flange FFM61S
Connection method: flange (flat position welding and butt welding)
Caliber: DN15～DN2000
Pressure measuring method: socket welding, flange and screw
Pressure: 0～40MPa
Temperature：-40～850℃
Material: 304 stainless steel, 316 L stainless steel and 20# carbon
steel (Please refer to Selection Table)
Application: liquid, gas and steam
Applicable medium: widely applied to the flow measurement in municipal
works, power, chemical industry, petrochemical processing, metallurgy
and food processing; it is almost applicable to all gas and liquid
media.
Flange V cone flow sensor
2、Directly welded FFM61Z Connection method: directly welded to processing pipe
Caliber: DN15～DN2000
Pressure measuring method: socket welding, flange and screw
Pressure: 0～40MPa
Temperature：-40～850℃
Material: 304 stainless steel, 316 L stainless steel and 20# carbon
steel (Please refer to Selection Table)
Application: oil delivery pipe; gas pipe, steam pipe network and
high-pressure processing pipe
3、clamped FFM61D
Connection method: flange end butt clamped
Caliber: DN15～DN150
pressure measuring method: socket welding and screw
Pressure: 0～40MPa
Temperature: -40～850℃
Material: 304 stainless steel, 316 L stainless steel and 20# carbon
steel (Please refer to Selection Table)
Application: liquid, gas and steam
V cone flowmeter (composed of V cone sensor
and differential pressure transmitter)
In accordance with the different customers’ demands, the flowmeter
composed of V cone sensor and differential pressure transmitter
can be supplied in the following two ways:
1、V cone sensor
Only the components (V cone and measuring pipe)for the measurement
on differential pressure signal are provided. The differential pressure
transmitter, three-valve manifold and flow display are not provided.
The output signal is differential pressure. The flowmeter is assembled
by a customer itself.
2、V cone flowmeter
It is composed of V cone sensor and differential pressure transmitter.
The installation takes two forms: divided and integrated.
The divided V cone flowmeter is composed of independent V cone sensor
and differential pressure transmitter. The pressure guiding pipe
that lies between V cone sensor and differential pressure transmitter
is installed by a customer itself. The differential pressure transmitter
is supplied in accordance with the customers’ demands.
Integrated installation means that the differential pressure transmitter,
three-valve manifold and V cone sensor have been integrated into
an organic whole when the product leaves the factory. The customer
doesn’t need connecting pressure guiding pipe upon the buying of
integrated V cone flowmeter. If needed, corresponding flow integrator,
pressure transmitter and temperature transmitter can be provided
by the manufacturer.
Measurable fluids：
1、gas
Coal gases: coke-oven gas, blast furnace gas and municipal gas
Natural gas: the natural gas in which moisture content is more than
5%
All kinds of hydrocarbon gases: alkane and olefin gases
All kinds of gases: hydrogen, helium, argon, oxygen and nitrogen
Corrosive gases: humid chloride gases
Gases: including gases containing moisture and dust; compressed
air
flue gas: flue gases discharged from all kinds of boilers and heating
furnaces
2、steam: saturated steam and superheated steam
3、liquid
oils: crude oil, fuel oil, water-containing emulsified oil, diesel
oil and hydraulic oil
water：raw water, drinking water, water for industrial production
and sewage
all kinds of water solutions: acid solution, alkali solution and
salt solution;
organic chemicals: methanol, glycol and xylene
4、special fluids
oil+ HC gas + sand
gas-containing water: H2O+N2+ air; H2O+CO2
Selection table for FFM61 V cone flow sensor
Meter type
FFM61S
flange butt
FFM61Z
direct welding
FFM61D
butt clamp
Pipe diameter
— —15
15mm
20
20mm
25
25mm
40
40mm
50
50mm
65
65mm
80
80mm
100
100mm
125
125mm
150
150mm
— —
— —
2000
2000mm
Surface, flange, cone and connecting
pieces
A
The connecting piece of the pipe’s
flange cone is all 304 stainless steel
B
The connecting piece of the pipe’s
flange cone is all 316L stainless steel
C
Pipe flange is 20# carbon steel. Cone
and connecting pieces are made of 304 stainless steel
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