Views: 0 Author: Site Editor Publish Time: 2026-04-10 Origin: Site
Having been working in the mechanical manufacturing industry for so many years, we often hear customers complaining to us: "The equipment has been running for a long time, and the pipe connections always have problems like 'leaking, dripping and spilling'." "When transporting high-temperature heat-conducting oil, we are unsure and afraid of any safety accidents." "The rotation is not smooth, causing the equipment to have excessive torque." In fact, these problems can be easily solved by a high-quality DN rotary joint.
Some customers ask: “There are so many rotary joints on the market. Why choose the DN series?”
The answer is simple: Professionals use professional tools. High-end equipment needs high-end components.
The DN series rotary joints (with nominal diameters from DN15 to DN200 and beyond) is specifically designed for high flow rate, heavy load, high temperature, or corrosive working conditions.
In applications like cooling systems for 50-ton steel converters or large chemical reactors, fluid transfer volume is huge.
Ordinary rotary joints have small diameters — like a “thin neck” — which restrict flow and increase pressure loss.
Our DN series rotary joints products cover DN100, DN150, and even DN200.
With dual-passage or large-bore designs, cooling water or thermal oil flows smoothly and fast, directly improving heat exchange efficiency.
Some manufacturers cut costs with inferior steel. We don’t.
For thermal oil (up to 320°C), steam, or highly corrosive chemicals, our DN rotary joints feature:
Stainless steel or PTFE-lined inner rings
High-strength alloy steel outer bodies
This means they withstand high temperature and high pressure while resisting corrosion — preventing seizure and leakage caused by rust.
What’s the worst thing that can happen with a rotary joint? Leakage.
A single drop of thermal oil or hot water is not just waste — in steel or petrochemical plants, it’s a serious safety hazard.
Our DN series rotary joints are machined on precision CNC equipment and fitted with imported seals (e.g., Parker or graphite rings).
Whether with a double-spherical or floating seal design, they offer automatic wear compensation.
In simple terms: the more they run, the better they seal — keeping everything tight even under pressure fluctuations and vibration.
We’ve seen many cases where a customer buys a new joint, installs it, and it fails again within weeks. Why?
Because installation errors are the real culprit.
As a responsible supplier, here are a few key points we always remind our customers — and build into our service:
Leave room for expansion
For steam or thermal oil lines, thermal expansion is real.
We strongly recommend using metal hoses between the piping and the rotary joint.
This absorbs stress from thermal expansion and protects the joint from external forces — easily doubling its service life.
Anti-rotation design — keep it flexible
Some customers weld the anti-rotation rod rigidly in place — that’s a big mistake.
Our DN series rotary joints includes an anti-rotation mechanism.
The joint housing must be allowed some free axial movement. Never force it rigidly.
Customization available
Whether you need a de-icing spray bar on a truck or a hydraulic excavator swing joint — standard sizes not fitting? No problem.
We offer non-standard customization: threaded or flanged connections, single or dual passage — just send us your drawing.
When you choose Shandong Focus Machinery Co., Ltd.DN rotary joints, you’re not just buying a part. You get:
Peace of mind — Long maintenance-free intervals. Some models even come with wear monitoring sensors, so you always know the status without frequent shutdowns.
Lower operating costs — No wasted media. Also protects expensive drive components from damage.
Safety — Eliminates the risk of high-temperature oil spray, protecting your frontline workers.
