Diaphragm Seals are devices used to measure fluid pressure, especially when the measured fluid is incompatible with the instrument sensor element, may corrode the internal parts of the measuring instrument, the fluid has high viscosity or contains suspended solids, and is easy to solidify when the temperature changes.
The working principle of Diaphragm Seals is based on the incompressibility of fluids. It isolates the process fluid from the sensor element of the measuring instrument through an elastic diaphragm, which is connected to the diaphragm seal body. The inner cavity between the diaphragm and the measuring element (such as a spring tube) is first evacuated and then filled with a properly degassed filling fluid. In this way, the mechanical stress generated by the process fluid on the diaphragm can be transferred to the measuring element through the filling fluid, thereby realizing the measurement of fluid pressure.
Diaphragm Seals are involved in the following application areas
Chemical and petrochemical: In chemical plants, refineries and other places, diaphragm seals can be used to measure the pressure of corrosive, high-temperature, high-pressure or solid-particle-containing fluids.
Pharmaceutical industry: In the pharmaceutical process, diaphragm seals can ensure the sealing of drug delivery pipelines and equipment, prevent contamination and cross-infection, and ensure the purity and quality of drugs.
Food industry: During food processing and transportation, diaphragm seals can be used to prevent food leakage and contamination, ensuring food hygiene and quality.
Other industries: Such as alkali, chemical fiber, steel and other industries, diaphragm seals are also widely used to measure the pressure of fluid media.
Features and advantages of Diaphragm Seals
Isolation effect: Effectively isolate process fluids and measuring instruments to protect instruments from fluid corrosion and contamination.
Strong adaptability: Suitable for various complex working conditions, such as high temperature, high pressure, corrosive fluids, etc.
Accurate measurement: Through the conduction of the filling fluid, the fluid pressure can be accurately measured.
Safe and reliable: Reasonable design, safe and reliable, can prevent fluid leakage and contamination.
The materials of the diaphragm and the seal should be selected according to the properties and temperature of the process fluid to ensure that they can withstand the chemical erosion and temperature effects of the fluid. At the same time, the selection of the filling fluid should also be based on the properties and temperature of the fluid to avoid any possible contamination or damage.
