Type 857

Combination hybrid double mechanical seal; media side stationary O-ring seal; atmosphere side: metal bellows for centrifugal and screw pumps, among others, for bitumen and asphalt
Further versions:
– 857S (special version)
Sizes also available in inch dimensions
Not all max. values may be claimed at the same time!


Min: 30 mm

Max: 100 mm


Max: 25 bar


Min: -25‎°C

Max: 250‎°C