Balanced by the bellows, without the need for astepped shaft (models MSE10B, MSE20B). Suitable for working in applications with high pressures.The O-ring resting on the shaft does not cause wear asthere is no axial movement (changes in pressure). Recommended for working with sticky or viscous luids that require cleaning processes (CIP) or-sterili sation processes (SIP) in situ due to the geometry ofthe spiral-wound bellows.