Metal Bellows

BELLOWS DESIGN :

The bellows is the flexible element of the expansion joint. It must be strong enough circumferential to withstand the pressure and flexible enough longitudinally to accept the deflections for which it was designed, and as repetitively as necessary with a minimum resistance. This strength with flexibility is a unique design problem that is not often found in other components in industrial equipment.

Metal Bellows Design

Most engineered structures are designed to inhibit deflection when acted upon by outside forces. Since the bellows must accept deflections repetitively, and deflections result in stresses, these stresses must be kept as low as possible so that the repeated deflections will not result in premature fatigue failures. Reducing bending stress resulting from a given deflection is easily achieved by simply reducing the thickness of the bending member, which in the case of the bellows, is the convolution. However, in order to withstand the pressure, the convolution, which is also a pressure vessel, must have a thickness great enough that the pressure induced membrane stresses are equal to or less than the allowable stress levels of the materials at the design temperatures. This conflicting need for thickness for pressure and thinness for flexibility is the unique design problem faced by the expansion joint designer.

Howls are not springs, in that the vast majority of their redirection produce bowing anxieties in overabundance of the materials' yield quality. Seeing how different materials perform and their capacities in this "plastic" distortion locale requires years of experience and plan conditions based upon this exact comprehension. 

That howls routinely work "plastic-ally" ought not be a reason for worry, subsequent to the majority of the materials from which cries are made offer comparable exceptionally malleable qualities. Specifically, the perseverance furthest reaches of these materials, which can be approximately portrayed as the anxiety at which disappointment will happen at ten million cycles of rehashed focusing, is about the same as their yield stress, or the time when perpetual distortion will happen. A cries which is required to withstand 3000 cycles of a given redirection and weight, and which at last falls flat after 10,000 cycles, has unquestionably exhibited more than worthy execution. Nonetheless, it has encountered, amid every last cycle, twisting burdens far in overabundance of as far as possible and along these lines the yield stress, and once avoided, would not have returned all alone to their unique un-deflected length or shape, as a spring is required to do. At the end of the day, they would have "taken a set."

Products  :

1) Bellows Coupling.

2) Valve Bellows.

3) Pressure switches Bellows.

4) Axial Expansion Joints.

5) Lateral Expansion Joints.

6) Hinged Expansion Joints.

7) Gimbal Expansion Joints.

8) Inline Pressure Balanced Expansion Joints.

9) Elbow Pressure Balanced Expansion Joints.