Low Torque Rotary Unions ®

Duff-Norton Series 4000 Rotary Unions ® are
the perfect choice for high speed applications.
The 4000 Series features a unique balanced
seal for long life and low torque, and a
double row ball bearing to absorb radial and
thrust loads. The 4000 Series features a
stainless steel shaft, bronze housing and a
primary seal of carbon graphite against
ceramic to offer maximum life and durability.
The 4000 series is available in single or dual
flow models.
Max Water Pressure 1000 psi 68 bar
Max Water Temp.  200° F 93° C
Max Hot Oil Pressure  1000 psi 68 bar
Max Hot Oil Temp.  200° F 93° C
Max Air Pressure 300 psi 20.4 bar
Max RPM NPT 750 750
Max RPM MT 5000 5000