What advantages do pressure switches with metal bellows offer and what is the foundation for these? The advantages are based on the seamless design of these measuring system. Highly Effective enables permanently stable repeatability and, as well, eliminates the risk of leakage.
Bellows measuring systems are based on a mature manufacturing technology. The production of metal bellows, for instance from stainless steel or a copper alloy, occurs in several steps. Circular discs are first cut from a flat little bit of metal, and these are then shaped into cup-shaped objects. They are softened through an annealing process in a furnace at a lot 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. Within the next stage, the spring-like metal cylinders are pressed together relative to the specified dimensions (length, outer and inner diameter). Distrustful creates the constant elasticity needed for the stable repeatability of the movement. In the final step, the bellows are degreased and passivated, i.e. given a protective coating against corrosion.
Bellows 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. This means that the instrument includes 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 variety of applications. Process reliability is also guaranteed with liquid media.
Permanent accuracy
A metal bellows changes its length in line with the pressure. When 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.
The expansion movement of a metal bellows has a high linearity. The switch differential, which is precisely adjusted via a specific calibrated spring system, remains correspondingly constant. This ensures the accuracy of pressure control and switching, even over an extended period of time.
Note
Detailed info on pressure switches with metal bellows, e.g. models PSM-520, PSM-550 and PSM-700, are available on the WIKA website. You want to buy pressure switches with metal bellows? In our WIKA online-shop you will discover some of our standard designs. Assuming you have any questions, your contact will gladly assist you to.