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| Technical Features |
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1. Reshaping the Velocity Profile
The V-cone flow transducer is similar to
other differential pressure (DP) meters in the flowrate equations,
however, V-cone geometry is quite different from traditional
DP meters. The V-cone flow transducer constricts the fluid
by positioning a cone in the center of the pipe.
.jpg) Fluid
flows completely in a long pipe without any obstruction or
disturbance. Fluid velocity in pipe is different. It will
be lower near pipe wall and highest in pipe center due to
pipe wall friction makes fluid velocity slow. If V-cone hangs
in center of pipe, it will interact with high flow velocity
area directly. V-cone forces high flow velocity area to mix
with low flow velocity near pipe. Hole of orifice plate is
in the center of pipe and won¨t interact with high flow velocity
area. This is the biggest advantage of V-cone flow transducer
at lower flowrate. When flowrate decreases, V-cone interacts
with maximum flow velocity in pipe continuously. When other
differential pressure meters may loss their useful differential
pressure signal, V-cone flow transducer can still produce
it. |
2. High Accuracy
The primary element of V-cone flow transducer can be accurate to ＼0.5%. System accuracy of flow measuring depends on accuracy grade of V-cone flow transducer, differential pressure transmitter and secondary instrumentation etc.
3. Excellent Repeatability
Repeatability of V-cone flow transducer can be up to ＼0.1%, or even better.
4. Wide Turndown Ratio
Turndown ratio of V-cone is outstripping traditional differential pressure meters. Typical turndown ratio of V-cone is 10:1, even bigger is attainable. When Reynolds number is low to 8000, flowmeter can still produce differential pressure. Therefore, it can measure fluid within lower Reynolds number. |
5. Low Straight Pipe Requirement.jpg)
There is little ideal flow state in practical installing pipe. If flowmeter is installed on pipe where fluid can not flow completely, such as elbow, valve, converging pipe or diverging pipe, T-joint pipe etc, flow state will be interfered. Substantive error may be occurred once other flowmeter measuring technology is applied. Application of V-cone flow transducer can reshape flow state at upperstream of V-cone, overcoming this problem. Due to contour of V-cone and central installing position, when fluid closes to V-cone, flow state will become flattening to flow completely.
Fluid can flatten flow state when flows in V-cone pipe, therefore, compared with other differential pressure meters, it will better affect upperstream disturbance. V-cone straight pipe for upperstream: 0 ~ 3D; for downstream: 0 ~ 1D. It will be beneficial for customers with large size, expensive pipe, or short running pipe.
Some special conditions, such as, single or double elbow at different plane or close to meter upperstream, V-cone can still produce flattenning flow state. This means when different fluid state closes to V-cone, it will always produce a foreseeable flow state to ensure measuring accuracy. |
6. Long Term Stability
Due to contour of V-cone contracts fluid without impacting against abrupt surface, a boundary layer forms along cone surface to directs fluid away fromβedge. This meansβedge can not be worn by dirty fluid, however, edge of orifice plat is worn frequently. Therefore, βratio keeps constant to make V-cone transducer have long term stability. |
7. Signal Stability.jpg)
Differential pressure meter normally has signal fluctuation, even under stable flowrate, signal produced by primary elements still has fluctuation. For example, orifice plate
flowmeter will form long vortice behind orifice plate. This long
vortice will produce high amplitude and low frequency orifice
signal to interfere flowmeter reading. As for V-cone flow transducer,
when fluid passes V-cone, it will form short vortice behind
V-cone and produce low amplitude and high frequency signal to
change into stable V-cone signal.
Shown as right figure: V-cone and orifice signal.
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8. Low Permanent Pressure Loss
Because fluid do not impact smooth surface of abrupt V-cone, permanent pressure loss of V-cone flow transducer is lower than that of orifice plate meter. At the same time, due to V-cone stable signal, for same flowrate, full scale of V-cone differential pressure signal is lower than that of other differential meter. This will decrease permanent pressure loss.
9. WideβRatio
Unique V-cone contour allows a wide range of βratio. Standard βrange: 0.45, 0.55, 0.65, 0.75, 0.85.
10. No Area of Stagnation
Due to design concept of sweeping, there will be no stagnation
area for particles, debris or coagulum. It has function of
self-cleaning and is suitable to measure dirty fluid.
11. Mixing of Different Materials
The short vortices behind V-cone will mix with the downstream fluid thoroughly, therefore, V-cone flow transducer can be used as mixer in many applications. |
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