RTH Series — Rotary Joint for Water/Coolant

The RTH series is a patented rotary joint independently developed by Ruitus on the basis of conventional H-type water joints. Its external multi-spring balanced seal keeps media flow smooth and elastic compensation uniform, and unlike legacy designs it is not affected by scaling — a common failure cause in cooling circuits. The result is a long-service, low-leakage joint for water, coolant and light-oil duty.

Maintenance was the second design priority. The sealing friction pairs are replaceable without scrapping the joint, so a worn unit is restored on-machine in minutes at a fraction of replacement cost. Internals are stainless steel with anti-corrosion treatment; the body is compact and lightweight with low frictional torque, which reduces spindle drag at high speed. Connection options cover G / BSP / NPT threads, and standard flanges can be supplied on request.

Selecting an RTH model takes four parameters: medium, working pressure, temperature and rotary speed. Standard units cover 200–3,000 rpm at up to 1.6 MPa / 120 °C. Send those four values plus your connection size to our sales engineers and we will return a firm model recommendation within one business day. If your duty involves saturated steam above 120 °C or thermal oil, the RTQ series (2.0 MPa / 350 °C) is the correct platform instead.

Commercially, standard RTH units are priced $40–200 FOB, typically 60–80% below equivalent European and American brands, with tiered volume discounts from 20 units. Every unit is produced in our 10,000 m² ISO 9001:2015 plant and ships to 70+ countries, so spare-part and re-order lead times stay short across global service networks.