What is the difference between a dry pressure gauge and a liquid-filled pressure gauge?
Release time: 2025-05-10
In the industrial field, pressure gauges are used to measure the pressure of gases and liquids to ensure the safety and stability of equipment. According to different working principles, pressure gauges can be divided into dry pressure gauges and liquid filled pressure gauges. The two are different in structure, performance and application, and are also suitable for different working environments.
Dry pressure gauge is a commonly used pressure measurement tool that is not filled with liquid. Its working principle is to measure pressure through mechanical parts (such as springs, pointers and dials) and convert it into a pressure value displayed on the dial. Since there is no liquid filling, the structure of the dry pressure gauge is relatively simple and the cost is low. It is suitable for environments with small vibrations and small pressure fluctuations.
Advantages of dry pressure gauge:
Low cost: There is no liquid filling, and the manufacturing cost is relatively cheap.
Fast response speed: Since there is no liquid buffer, pressure changes can be reflected on the dial more quickly.
Simple structure: There are fewer mechanical parts and it is easy to maintain and repair.
Disadvantages of dry pressure gauge:
Susceptible to vibration: If there is strong vibration or pressure fluctuation in the working environment, the accuracy of the dry pressure gauge may be affected.
Lower accuracy: In environments with large vibrations or temperature changes, it may not be possible to provide stable pressure readings.
Therefore, dry pressure gauges are usually used in places where the pressure measurement accuracy is not high and the environment is relatively stable.
Liquid filled pressure gauges are pressure measurement tools filled with liquid (usually glycerin, silicone oil or other viscous liquids). The main function of the liquid is to reduce the impact of vibration and pulse pressure on the measurement, thereby improving the stability and accuracy of the measurement.
The working principle of the liquid filled pressure gauge is similar to that of the dry pressure gauge. Both of them deform the internal springs, pointers and other mechanical parts by measuring pressure. However, unlike the dry pressure gauge, the industrial mechanical liquid filled pressure gauges stabilizes the movement of mechanical parts through the damping effect of the liquid to avoid errors caused by vibration and pressure fluctuations.
Comparison Table: Dry Pressure Gauges vs. Liquid Filled Pressure Gauges
| Feature | Dry Pressure Gauges | Liquid Filled Pressure Gauges |
|---|---|---|
| Structure | No liquid filling, simple structure | Filled with liquid, complex structure |
| Cost | Lower | Higher |
| Response Speed | Fast | Relatively slower |
| Accuracy | Lower accuracy | Higher accuracy |
| Suitable Environment | Stable environment, low vibration | High vibration, frequent pressure fluctuations |
| Vibration Resistance | Susceptible to vibration | Effectively reduces vibration impact |
| Protection | No protection | Reduces wear and corrosion, extends service life |
| Temperature Adaptability | Good | May be affected by extreme temperatures |
By comparison, we can see that dry pressure gauges and liquid filled pressure gauges have their own advantages. Dry pressure gauges are suitable for use in relatively stable environments, while liquid-filled pressure gauges perform better in environments with high vibration and frequent pressure fluctuations. When choosing a pressure gauge, companies should decide which type of pressure gauge is most appropriate based on the actual working environment and needs to ensure the stable operation of the equipment and the accuracy of the measurement.
