What is the function and principle of the flow limiting orifice plate?

The role of the flow-limiting orifice plate.

1. When there is a large pressure drop in the upstream and downstream of the valve in the pipeline, in order to reduce the erosion of the valve by the fluid, when the throttling through the orifice plate will not produce the gas phase, the orifice plate can be connected in series upstream of the valve.

2. Places where pressure reduction is required to reduce noise or wear, such as venting systems.

3. Places where the fluid needs a small flow and continuous flow, such as the flushing pipeline of the pump, the bypass pipeline (low-flow protection pipeline) of the hot standby pump, the analysis sampling pipe, etc.

4. Occasions when process materials need to be depressurized.

The principle of the flow-limiting orifice plate.

The flow limiting orifice can be used as a flow measuring element to measure the flow rate or as a throttling element to limit the flow rate and reduce the pressure.

When there is a certain pressure difference between the front and back of the orifice plate, the fluid flows through the orifice plate, and for a certain pore size, the flow rate through the orifice plate increases with the increase of the pressure difference. However, when the pressure difference exceeds a certain value (called the critical pressure difference), the flow rate of the fluid through the orifice shrinkage reaches the speed of sound, and no matter how the pressure difference increases, as long as the pressure upstream of the orifice plate remains constant, the flow through the orifice will remain at a certain value and will not increase.

The difference between a flow-limiting orifice plate and a standard orifice plate.

First, the principle is different.

The principle of throttling orifice plate is: when the fluid flows in the pipeline, due to the local resistance of the orifice plate, the pressure of the fluid decreases and the energy is lost, which is a phenomenon in thermodynamics.

This is called throttling. This method is better than using a regulating valve.

Be simple, but you have to choose it properly, otherwise, the liquid is prone to cavitation.

Affect the safe operation of pipelines.

The principle of the flow-limiting orifice plate is as above.

Second, the standards are different.

Throttle orifice plate manufacturing standard: GB2624-93 ISO5167-91

The flow-limiting orifice plate is designed and manufactured according to the national standards GB2624, HG T 20570, GD2000, GD87 and other standards.

The purpose of the flow-limiting orifice plate is to confine the fluid or reduce the pressure of the fluid. The flow through the orifice increases as the pressure drop increases, and when the pressure will exceed a certain value (i.e., the critical pressure drop), the flow rate will not rise again.

There are many places where this thing is used.

It's not just this place.

Broadly speaking, there are two functions.

Rate limiting. Buck.

It is generally installed on a slip road.

But now we are here to install on the main road.

It's the outlet of the pump.

In this way, it has both limited flow and depressurization.

But I think at the same time it has a pressure-holding effect on the pump.

Now ask for advice.

Can anyone tell me.

How is its effect on the pressure holding of the pump calculated? Thank you in advance!

1.The installation of the flow limiting orifice plate shall be carried out in accordance with the requirements of the relevant design drawings; 2.When installing, the installation position of the flow limiting orifice plate should ensure that it is easy to inspect and will not affect the normal construction of the project; 3.

During installation, the seals at the junction of the flow limiting orifice plate and the pipeline shall be installed in accordance with the relevant standards; 4.During installation, the flow limiting orifice plate should be well connected with the elbow, elbow, tee and other connectors of the pipe Gaoyan liquid channel; 5.During installation, the flow limiting orifice plate should be installed on the pipeline, and ensure that it does not leak water and appear in the cavity; 6.

After the installation is completed, it should be inspected to ensure that the installation quality meets the requirements.

1. Occasions when process materials need to be depressurized.

2. When there is a large pressure drop in the upstream and downstream of the valve in the pipeline, in order to reduce the erosion of the valve by the fluid, when the gas phase will not be produced through the orifice plate and the throttling will not be generated, the orifice plate can be connected in series in the upstream of the valve.

3. Places where the fluid needs a small flow rate and continuous flow, such as the flushing pipeline of the pump, the bypass pipe of the hot standby pump with the empty first channel (low-flow protection pipeline), the analysis sampling pipe and other places.

4. Places where pressure reduction is required to reduce noise or wear, such as venting systems.

At present, the application of flow-limiting orifice plate in domestic process equipment is still insufficient, and there is a gap compared with foreign countries. Where it is necessary to limit the flow rate or reduce the pressure, regulation loops are mostly used to achieve this. In some places, the flow rate of the fluid is only required to be limited to a certain specified range without adjustment, and the accuracy of the flow rate is not high, so it can be replaced by a flow-limiting orifice plate.

Therefore, it is necessary to fully understand the advantages of the flow-limiting orifice plate and pay attention to the application of the flow-limiting orifice plate in the design of the process device. The flow-limiting orifice plate is designed and manufactured according to the national standards GB2624, HG T 20570, GD2000, GD87 and other standards.