Union RHB is designed to work at 400°C and high rotation speed. Such performance can be reached using two special seals with double balancing and with the interposition of a pressurized fluid for cooling of primary seal.

This fluid is circulated by a pumping and cooling group which continuously verifies the system's effectiveness and signals through visual and sound alarm possible variations from the set values.

These results are reached by using ball bearings with closed loop oil cooling. Oil sealing is obtained by two double balanced seals which guarantee the effectiveness of system even in case of electrical failure.

Double mechanical seals with pressurized barrier fluid avoid any leakage of the process fluid to atmosphere: in worst case the barrier fluid will leak into the process.