Difference between diaphragm pressure gauge and ordinary pressure gauge

Ordinary pressure gauges are used to measure the pressure of non-corrosive liquid gas, and diaphragm pressure gauges are generally used in two aspects:

1. Measure the pressure on occasions with corrosion resistance requirements (the measured medium is corrosive, and different diaphragm materials should be used for different corrosive media);

2. Food hygiene requirements, because the measured medium does not flow inside the pressure gauge when the pressure is measured by the ordinary pressure gauge, it is easy to repeat pollution.

Diaphragm pressure gauge is suitable for measuring the pressure of liquid, gas or granular solid medium with high viscosity, easy crystallization, high corrosiveness and high temperature. The isolation diaphragm has many materials to adapt to various corrosive media.

The measuring principle is that the diaphragm pressure gauge adopts indirect measuring structure, the diaphragm is deformed under the pressure of the measured medium, and the sealing liquid is compressed to form a pressure equivalent to P, which is transmitted to the pressure instrument to display the pressure value of the measured medium.

Everyone must be able to choose a suitable pressure gauge after figuring out the difference between diaphragm pressure gauge and ordinary pressure gauge.

The operation effect of diaphragm pressure gauge is very good, which is loved by many users. If you are interested, you can feel it sometime. So what can't be ignored in the process of using diaphragm pressure gauge? Here are some basic knowledge that needs everyone's attention. I hope everyone can master it.

I will mainly share some basic knowledge about diaphragm pressure gauge for you, so as to deepen your impression and understanding. Diaphragm pressure gauge mainly refers to the pressure gauge that separates the indicating part from the measured medium by means of a diaphragm device filled with working liquid. Among them, diaphragm devices mainly include diaphragm type and bellows type.

Comparatively speaking, the former is widely used in the current industrial field, so here we mainly introduce the diaphragm pressure gauge. In the process of assembly, firstly, the spring tube is vacuumed by professional equipment, and then a certain amount of liquid is injected, and it is sealed and isolated by diaphragm. Therefore, when measuring the pressure of the medium, the measured working medium directly acts on the diaphragm, and the diaphragm deforms upwards.

Through the transmission of working liquid, the pressure is transferred to the spring tube to generate a certain amount of deformation, and then the movement is driven by the connecting rod, so that the pointer indicates the measured pressure value on the dial of the diaphragm pressure gauge. In practical work, according to different working environment and conditions, we need to choose the corresponding pressure gauge. For example, when measuring the pressure of general gas and water, ordinary pressure gauges can be used for measurement.

When measuring some corrosive media, such as nitric acid and other media pressures, stainless steel pressure gauges are needed. However, if the corrosion performance of the medium is stronger, or the working medium pressure is prone to crystallization or solidification, even the stainless steel pressure gauge may cause the instrument to lose its function. Diaphragm pressure gauge can solve these problems.

This is because the structure of diaphragm pressure gauge is special, so when measuring the pressure of these media, the diaphragm membrane inside it can prevent the media with high viscosity, easy crystallization and solidification from flowing into the pressure guide hole, thus ensuring the normal operation of the instrument. For this reason, diaphragm pressure gauges have been widely used in the measurement of petrochemical, metallurgical and electric power industries.

The main function of gauge bending.

Generally, when detecting steam, a pressure gauge bend will be added to the pressure gauge. In fact, the thing that connects the pressure gauge with the pipeline is the pressure gauge bend (also referred to as the bend), which is generally called the buffer tube when we purchase it. There are generally two forms of gauge bending: one is annular bending, and the other is U-shaped bending.

Main functions of pressure gauge bend

1. The bending of pressure gauge table is used to protect the transmission mechanism inside the table from the damage of medium temperature and medium corrosion. Usually, the medium is corrosive to a certain extent, and the pressure gauge bend must be added. When the temperature of the medium is greater than 60℃, the pressure gauge bend must be added. If the pressure gauge is installed on the clean drinking water system, there is no need to add it.

2. The bending of the pressure gauge is used to reduce the vibration and impact, and it also has a certain heat dissipation effect on the medium with higher temperature, which is used to protect the pressure gauge and reduce the temperature influence error of the pressure gauge.

3. The damping screw at the orifice of the pressure gauge joint in the bending part of the pressure gauge plays a throttling and buffering role by reducing the flow area, which is mainly useful for medium pressure pulse.

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