RTQ Series — Rotary Joint for Steam & Thermal Oil

The RTQ series is a patented improvement on conventional Q-type rotary joints, engineered for saturated and superheated steam plus thermal oil service. An integrated guide ring delivers superior concentricity, while the dual-spherical sealing structure uses imported antimony-impregnated graphite sealing rings that tolerate dry running and thermal cycling far better than standard mechanical seals. Springs are imported Grade 631 stainless steel for high-temperature resistance, and the rotor is heat-resistant alloy steel.

Steam service punishes weak seals: water hammer, condensate surges and scale quickly destroy ordinary designs. The RTQ dual-spherical graphite pair self-adjusts under thermal expansion, and the RTQS-G / RTQS-X executions add a rotating internal tube for positive condensate removal from heated rolls. Under proper installation with working steam traps, graphite seals typically last 2–4 years on saturated steam and 3–5 years on thermal oil at 300 °C; seal rebuild kits are stocked for on-machine service.

Selecting an RTQ model takes four parameters: medium, working pressure, temperature and rotary speed. Standard RTQ-D units (DN15–DN65) cover 50–200 rpm up to 2.0 MPa / 350 °C, with R / Rc taper threads to ISO 7-1 and quick-change flanges from DN20; NPT and G threads are available on request — see the model and dimension tables above. Duty below 120 °C with water or coolant? The RTH series is lighter and more economical; above that, RTQ is the correct steam / thermal-oil platform.

Commercially, standard units are priced $50–500 FOB — typically 60–80% below equivalent European and American brands — with volume discounts from 20 units. Standard models ship in 3–15 days after order confirmation with a minimum order of 1 unit; large-volume schedules are confirmed in your quotation. Every unit is produced in our 10,000 m² ISO 9001:2015 plant and supported across 70+ countries.