JBJ Techniques Offers Marzocchi Sealing System
Marzocchi Pompe has produced a system of radial sealing at the shaft that is claimed to be able to bear enormous internal over-pressures without resulting in damage. This radial sealing is useful in single-direction hydraulic motors when, in certain conditions of use, high over-pressures will be generated at the motor output. With bi-directional motors, the area adjacent to the seal ring of the drive-shaft is maintained at atmospheric pressure by the drainage circuit. In single-direction motors, this area is directly connected to the output so any over-pressure impacts directly on the seal ring, causing the lip to turn over or the ring to be expelled from its seat with a consequent leakage of fluid. These products can also be supplied complete with anti-cavitation valves. The motors are supplied with an internal drainage circuit. In this case, the hydraulic motor always drains inside with a lower pressure; the combination of this product with a high-performance sealing ring increases