Valve groups have various functions in industrial applications, mainly including cutting off and conducting, balancing pressure, discharging and venting, etc. 12 Cut off and conduction effects

The globe valve in the valve group is mainly used to control the on/off of fluids. In the application of differential pressure transmitters, two shut-off valves respectively control the positive and negative pressure sides of the differential pressure transmitter. When it is necessary to stop measuring or perform maintenance, the measuring pipeline of the differential pressure transmitter can be cut off by closing the shut-off valve. Meanwhile, during the measurement process, opening the shut-off valve can ensure the continuity between the differential pressure transmitter and the measurement pipeline.

Balance pressure effect

The balance valve in the valve group is mainly used to balance the pressure on the positive and negative pressure sides of the differential pressure transmitter. During the measurement process, pressure fluctuations or temperature changes in the pipeline may cause pressure imbalance between the positive and negative pressure sides of the differential pressure transmitter, thereby affecting measurement accuracy. At this point, the pressure on both sides can be balanced by opening the balance valve to ensure measurement accuracy. Pollutant discharge and venting function

In some cases, impurities or liquids may accumulate in the measurement pipeline, which can affect the measurement accuracy of the differential pressure transmitter. At this point, the discharge or venting operation can be carried out by closing the shut-off valve and opening the balance valve to ensure the cleanliness and smoothness of the measuring pipeline.

Specific types and application scenarios

Valve groups can be divided into two valve groups, three valve groups, and five valve groups based on their composition. Two valve groups are typically used for direct connected gauge and absolute pressure transmitters, three valve groups are used for differential pressure and multivariable transmitters, and five valve groups are suitable for applications that require more complex control.