SN steam rotary joints

SN type steam rotary joint is a fluid dynamic sealing device widely used in the industrial field, mainly used to transport media such as steam, hot water or thermal oil from fixed pipelines to rotating or swinging equipment (such as drying cylinders, drums). As a typical representative of the S series rotary joint, this model is known for its stable spherical sealing structure and external compensation mechanism, making it suitable for working conditions with relatively low coaxiality requirements and reliable sealing.
1. Product Overview and Working Principle
The SN type rotary joint adopts a positive spherical sealing design, and its core sealing principle relies on the spring pushing the shell to produce axial displacement, thereby automatically compensating for the wear of the sealing graphite ring. This “external compensation” structure ensures effective isolation between internal media (such as high-temperature steam) and external air, preventing leakage. When the sealing surface wears out due to long-term use, the spring force will push the housing backwards, causing the new sealing surface to adhere and maintain the sealing performance.

SN type steam rotary joint is a fluid dynamic sealing device widely used in the industrial field, mainly used to transport media such as steam, hot water or thermal oil from fixed pipelines to rotating or swinging equipment (such as drying cylinders, drums). As a typical representative of the S series rotary joint, this model is known for its stable spherical sealing structure and external compensation mechanism, making it suitable for working conditions with relatively low coaxiality requirements and reliable sealing.
1. Product Overview and Working Principle
The SN type rotary joint adopts a positive spherical sealing design, and its core sealing principle relies on the spring pushing the shell to produce axial displacement, thereby automatically compensating for the wear of the sealing graphite ring. This “external compensation” structure ensures effective isolation between internal media (such as high-temperature steam) and external air, preventing leakage. When the sealing surface wears out due to long-term use, the spring force will push the housing backwards, causing the new sealing surface to adhere and maintain the sealing performance.
SN type rotary joint – suitable for steam and thermal oil media
Rotary joints, also known as swivel joints, enable fluid to flow into and out of rotating equipment through fixed pipelines. The fluids commonly used for rotary joints and swivel joints include steam, water, heat transfer oil, hydraulic oil, air, and coolant.
SN type rotary joint is a new generation of long-life series self-supporting rotary joint, used for steam and thermal oil media. It is designed to operate under high voltage, high speed, and high vibration conditions. In steam applications, its convex seal design provides up to 20% pressure and velocity (PV) combination performance compared to equivalent Q rotary joints, and extends the service life of the sealing ring by up to 15%. The increased spacing and contact surface of carbon oil-free bearings ensure greater horizontal pipeline stability and longer service life. SN rotary joints can achieve faster operating speeds and longer normal operating times. The size varies from 1/2 “to 2”. The rated specifications for steam rotary joints are a temperature of 280 ℃, a pressure of 20 bar, and a speed of 300 rpm. The rated temperature of the rotary joint for heat transfer oil is 343 ℃, the pressure is 20 bar, and the speed is 300 rpm. SN has a single or fixed siphon two-way configuration for steam media.
Design features:
Designed for steam media, with unique application performance
Convex spherical sealing ring, self centering seal, longer service life
Two internal support oil-free bearings, service life and reliability
Updated sealing cover to reduce maintenance and repair costs
Two widened carbon bearings with improved joints and siphon support