Welded Metal Bellows
The BT400 seal is specifically designed for the most demanding of High and Low temperature services as well
The stationary configuration, in which the flexible bellows element is fixed into the equipment casing, eliminates damaging "swashing" motion due to casing distortion or shaft deflection. It also insulates the flexible element from direct shaft vibration and promotes more positive sealing while significantly extending seal life .
The core of the seal is an edge welded bellows unit with a design proven over more than 20 years experience in many tens of thousands of applications to give many years of trouble free service.
The bellows is precision manufactured in Inconel 718 material and is subject to the very
highest levels of quality control to ensure consistent and reliable operating performance.
The pressure capability of the standard BT400 can be increased through the use of a double ply (laminated bellows plates) version. This design allows a low spring rate, providing face loads close to initial design values, as face wear occurs or shaft expansion reduces operating lengths.
Face Material Stationary Side : Carbon or SIC Rotary Side : SIC
Metal Components INCONEL 718 Bellows with Alloy 42 Retainer
SUS 316 for other Metal Parts
Packing : Grafoil
Pressure: Single ply : Vacuum to 2 MPa (20kgf/cm2G, 285 psi)
Pressure: Double ply : Vacuum to 3.5MPa (35kgf/cm2G, 498 psi)
Temperature : -240°C to 425°C (-400°F to 800°F)
Shaft Speed : to 50 m/s
Viscosity : to 1 Pa·s (1000cP)