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Duff-Norton's Series 1700 and 1900 High Pressure Rotary Unions®

Duff-Norton's Series 1700 and 1900 Rotary Unions® are equipped with Teflon® Encapsulated O-ring Seals suitable for most transfer fluids, and are standard with nickel plating, but also available in stainless steel.  The 1700 series has been designed to be used in medium to high pressure applications.  The high pressure of Series 1700 is obtained with the use of Single Acting Thrust Bearing, which permits slow rotation.  Certain industrial equipment is used with very high pressure, the 1900 series has been developed for these applications.  The 1900 series is equipped with a Double Acting Thrust Bearing and a Bronze Bushing.  The bearing permits higher pressure, while the bushing increases the guide of the shaft to allow faster rotating speeds than series 1700. 


Series 1700


Series 1900

Operating Parameters 

Series 1700
Max Temp. 248°F  (120°FC)
Max Pressure 5000 psi (350 bar)
Max RPM 80
Series 1900
Max Temp. 248°F  (120°FC)
Max Pressure 10,000 psi (700 bar)
Max RPM 100
Series 1700 Drawing
Series 1900 Drawing
Performance Charts
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