The HY series differential pressure hydrogen flowmeter, also known as the inner cone flowmeter, V-cone, or cone flowmeter, is a new type of differential pressure flowmeter with patented technology. Similar to other types of differential pressure flowmeters, it is based on the principle of energy conservation in sealed pipelines. The unique design of the HY series V-cone flowmeter expands the flow measurement range and avoids some limitations of traditional differential pressure flowmeters, resulting in better performance. The HY series V-cone flowmeter is a conical flow restrictor suspended at the center of the pipeline, which obstructs the flow of the medium and reshapes the velocity curve. The measured medium includes water, steam, air, natural gas, nitrogen, coke oven gas, and organic gases. The medium conditions can range from deep low temperature to supercritical state. The maximum working temperature is 450 ℃, the maximum pressure is 25Mpa, and the highest measurable Reynolds number is 5 * 106, while the lowest Reynolds number is 8 * 103 or even lower. Generate full-scale differential pressure signals ranging from a minimum of less than 0.1 kPa to a maximum of several tens kPa.

The HY series differential pressure hydrogen flowmeter is a type of differential pressure flow meter, and flow meters designed based on differential pressure principles have been in use for over a hundred years. The principle of differential pressure is based on the energy conversion principle in sealed pipelines, which means that for stable fluids, the flow rate is proportional to the square root of the flow velocity of the medium in the pipeline. When the medium approaches the cone, its pressure is P1. As the medium passes through the cutoff area of the cone, the velocity increases and the pressure decreases to P2. Both P1 and P2 are led to the differential pressure transmitter through the pressure tap of the cone flowmeter. When the flow rate changes, the differential pressure value between the two pressure taps of the cone flowmeter will increase or decrease.

The HY series V-cone flowmeter uses the same calculation formula as other differential pressure flow meters for flow calculation, but its unique design of the cutoff element forces the medium in the center of the pipeline to flow around the cone, which has many advantages compared to other differential pressure flow meters. We can use the ideal state flow velocity curve distribution diagram to understand the performance of a conical flowmeter. The fluid in the pipeline is not subject to any interference or obstruction, which is what we call the ideal flow state. Its velocity distribution is uniform, with almost zero velocity near the pipe wall, the maximum velocity near the center of the pipeline, and almost zero velocity near the pipe wall, due to the frictional force of the pipe wall on the medium. Due to the suspension of the cone at the center of the pipeline, it directly contacts the high-speed zone of the fluid, forcing the fluid in the high-speed zone to mix with the fluid in the low-speed zone near the pipe wall, thereby making the flow velocity uniform. So even if the flow rate is very low, the conical flowmeter can still generate the correct differential pressure through continuous action between the fluid and the highest flow velocity at the center of the pipeline.

In reality, it is difficult to achieve uniform distribution of flow velocity, and any changes in the pipeline can have an impact on the fluid, such as bends, valves, diameter reduction, expansion, pumps, tees, etc. Cone flowmeters use cones to reshape the upstream flow velocity distribution curve, ensuring measurement accuracy even in extremely harsh conditions.

Flow meter accuracy: ± 0.5%, ± 1.0%, ± 1.5%. The system accuracy should refer to the application conditions and the accuracy of the secondary meter.

Good repeatability: better than ± 0.1%

Range width ratio: Normally 10:1, it can be increased if necessary.

Low requirements for straight pipe section: The front 0-3D straight pipe section and the back 0-1D straight pipe section of the flowmeter can ensure measurement accuracy. Experimental results have shown that V-cone flow meters can approach single bent pipes or double bent pipes with different planes with little impact on accuracy.

Good long-term stability: The design of the cone shape ensures that the fluid flows through the cone in a gradual process without sudden changes, and the β value can remain unchanged for a long time. The instrument can be used for a long time without calibration.

Signal stability: All differential pressure flow meters will have "signal fluctuations", which means that even if the fluid is very stable, the signal generated by a throttling element will also fluctuate. For orifice plates, the vortices formed after the throttling element are relatively long, and these long vortices will generate high amplitude and low-frequency fluctuation signals, which will interfere with the reading of the differential pressure gauge. The conical flowmeter will form a small vortex downstream, generating low amplitude and high-frequency fluctuation signals.

Small pressure loss: Due to the absence of protruding baffles, the permanent pressure loss of the conical flowmeter is 3/4 lower than that of the orifice plate.

No retention dead zone: The "blowing" design of the cone does not have a dead zone, so there will be no accumulation of fluid debris, sticky slag or impurities on the cone.

The function of the mixer: The vortex generated downstream of the V-cone flowmeter is a short vortex, which can mix the medium downstream. Therefore, currently, while working as a flowmeter, the V-cone flowmeter can also be used as a static stirrer in many fields, which can quickly and fully stir the medium evenly.

Flange connection type body

Nominal Diameter

φ15——φ2000

Measurement medium

Liquid, gas, steam

temperature range

200℃…+800℃

accuracy class

Level 0.5, Level 1 (preferred), Level 1.5, Level 2.5

pressure rating

1.0MPa 10.5 MPa

surface material

The cone material is stainless steel, and the pipes and flanges are carbon steel (other materials are supplied according to the agreement)

Range of β values

0.45……0.8

Flange pressure type body

Nominal diameter

φ80——φ2000

Measurement medium

Liquid, gas, steam

temperature range

-200℃…+800℃

pressure rating

1.0MPa 10.5 MPa

accuracy class

Level 0.5, Level 1 (preferred), Level 1.5, Level 2.5

Table body material

The cone material is stainless steel, and the pipes and flanges are carbon steel (other materials are supplied according to the agreement)

Range of β values

0.45……0.85

Flange card type body

Nominal diameter

φ15——φ2000

Measurement medium

Liquid, gas, steam

temperature range

-200℃…+800℃

pressure rating

1.0MPa 10.5 MPa

accuracy class

The cone material is stainless steel, and the pipes and flanges are carbon steel (other materials are supplied according to the agreement)

Range of β values

0.45... 0.85 (cone with different β values can be replaced)