Hydraulic Rotary Unions – H Series

The Maier H Series is a universal rotary joint to accommodate transfer of water, steam and thermal oil under temperature, rotation and pressure. These rotary joints are equipped with maintenance-free carbon sealing rings and carbon bushing. Metal-impregnated sealing rings for thermal oil and higher pressure loads are provided for hot water and steam applications.

The H3 type features an integrated vacuum valve for the steam cylinder. Maier offers the H Series in many different versions to meet the customers requirements. The new improved and fortified generation of the standard H series is faster and more robust and offers more flexibility, due to a modular system. It contains a low friction moment as well and a large variety of different designs, from 1/2″ up to 12″.

Hydraulic Rotary Union Product Features:

  • Easy to repair, maintenance-free, no relubrication
  • Ductile cast iron housing, chrome steel cover and rotor. Stainless steel used for sealing face and high temperature resistant spring
  • Shatter-proofed sealing ring under high pressure thanks to compression-loaded wear-resistant graphite carbon. Series HW with metal impregnated graphite carbon, especially suited for thermal oil and considerably higher pressures, temperatures and speeds
  • Connection to rotating pressurized system by means of standardized connecting piece with right-hand or left-hand male thread NPT, BSP threads (ISO228) available, K flange with conical inner ring for quick disconnection


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