What advantages do pressure switches with metal bellows offer and what is the foundation for these? Advantages derive from the seamless design of these measuring system. This solution enables permanently stable repeatability and, simultaneously, eliminates the chance of leakage.
Bellows measuring systems are based on an adult manufacturing technology. The production of metal bellows, for instance from stainless steel or a copper alloy, occurs in a number of steps. Circular discs are first cut from the flat piece of metal, and these are then shaped into cup-shaped objects. They are softened through an annealing process in a furnace at more than 600 �C and drawn into long, thin-walled and seamless tubes.
Constant elasticity
The tubes are corrugated through the use of forming tools at ruthless, and are trimmed to the designed size. In the next stage, the spring-like metal cylinders are pressed together relative to the specified dimensions (length, outer and inner diameter). This creates the constant elasticity needed for the stable repeatability of the movement. In the ultimate step, the bellows are degreased and passivated, i.e. given a protective coating against corrosion.
Unique manufactured from stainless for pressure switches
Seal-free functionality
In a pressure switch, the metal bellows is brazed or welded to the procedure connection. Its other end is in touch with the transmission mechanism. Therefore the instrument has a fully seamless measuring system without the need for just about any rubber sealing materials and the risk of leakage is eliminated. This feature makes pressure switches with metal bellows ideal for a wide range of applications. Process reliability can be guaranteed with liquid media.
Permanent accuracy
A metal bellows changes its length in line with the pressure. Whenever a defined switch point is reached, it triggers the switching function with a transmission mechanism. If the pressure drops or rises again, the bellows returns to its original shape and the switch contact returns to its original position.
Crammed of a metal bellows includes a high linearity. The switch differential, that is precisely adjusted with a specific calibrated spring system, remains correspondingly constant. This ensures the accuracy of pressure control and switching, even over a long period of time.
Note
Detailed home elevators pressure switches with metal bellows, e.g. models PSM-520, PSM-550 and PSM-700, can be found on the WIKA website. You want to buy pressure switches with metal bellows? In our WIKA online-shop you will find some of our standard designs. Assuming you have any questions, your contact will gladly help you.