Summary 1:
throttling device, also known as differential pressure flowmeter, Orifice flowmeter contains (integrated orifice flow meter, standard orifice, annular orifice flow meter, integrated annular orifice flow meter)
V-cone flowmeter can be divided according to function name gas flow meter, flue gas meter, steam flow meter, gas flow meter, compressed air flow meter, liquid flow meter.
V cone flowmeter (V - coneflowmeter) is put forward in the 1980 s a novel differential pressure flowmeter, compared with the ordinary throttle body, it changes the throttling layout, from the center hole throttle annular throttle instead. Long-term use, V cone flowmeter compared with general differential pressure flowmeter, high precision, good repeatability and long-term by the installation condition of limited small, wear resistance, wide measuring range, suitable for smudgy medium, small pressure loss, etc. More because of the v-shaped cone itself as the flow field of the rectifier and become a new type has unique properties of excellent flowmeter. V cone flowmeter is a coaxial installed in the measuring tube tip of the cone as the throttle a new differential pressure type flow measuring devices, it is a kind of based on venturi tube measurement principle, and collection of classical venturi tube, circular orifice and wear-resistant orifice advantages in the integration of new type of throttling device.
Summary 2:
Features:
Short straight pipe upstream and downstream demand: straight pipe upstream of the shortest length is 3 d, (3 d) on the downstream side of the valve installation requirements, downstream straight pipe length for 3 d or less.
Accuracy: + / - 0.5%; Repeatability is 0.1%; A routine than 15:1.
The pressure loss of the resistance to dirt, small.
With the adjusting of the flow and the fluid mixing action.
Convenient installation, is the technical renovation of the ideal flowmeter;
Free maintenance, the workload is very small.
Short straight pipe before and after the request, generally only 0 to 3 d, upstream downstream only 0 to 1 d.
Loss of pressure is small, only 1/2 - one-third of orifice plate. Close to the venturi tube
V cone trailing edge to produce small vortex, the differential output stability, small fluctuations.
Without sundry stagnation, by cone thoroughly purge type design.
Throttling area of long-term stability, signal stability.
Summary 3:
Basic principles:
V cone flowmeter is a differentia pressure meter, its principle is based on the energy transformation in a closed pipeline Bernoulli's law. Using fluid continuity equation and Bernoulli's equation, the measured flow rate and output can be deduced the differential value of mathematical relationship. Is the law of conservation of mass continuity equation applied a mathematical expression of fluid movement. The type V cone flowmeter is a differentia pressure type flow meter, its is based on the law of conservation of energy in a closed pipe - Bernoulli equation and flow continuity equation, under the condition of the steady flow, pipe flow velocity and differential pressure in the direct ratio.
Measuring stability, flow coefficient remain unchanged for a long time.
High accuracy, good repeatability, and can realize flow of accurate measurement.
Range than wide, without secondary instrument software correction can reach 10:1.
Pieces of straight pipe installation requirement is low, small pressure loss.
The medium to be measured in pieces adaptability is strong, can measure the clean fluid, fluid containing solid grains, low pressure fluid, high humidity and various gas smudges fluid.
Flow components with self-cleaning function, resistant to wear and tear.
Summary 4:
The main technical parameters:
Nominal diameter (mm) : DN25 - DN2600
Nominal pressure (MPa) : 0.25-42
Precision level: 0.5 ~ 1.0 (differential pressure flow meter accuracy level should be higher than 0.2, 0.2)
Repeatability: plus or minus 0.1%
Job stress: 16 mpa or less
Working temperature: - 40-700 ° C
Ambient temperature: - 40-65 °
V cone flowmeter of the environment temperature of 0 to 50 ° C
Pipe diameter: 25-3000 - mm
The output signal: 4-20 ma
The power supply voltage: 24 VDC
Applicable medium: V cone flowmeter can measure liquid, gas, steam and gas and liquid two phase medium.
