25mm Clear Bore Single Stage DPRF

Differentially Pumped Rotary Feedthrough - DPRF25

The DPRF25 is a differentially pumped rotary feedthrough (DPRF) available in coarse, manual high precision and motorised high precision options. Mounted on a 70mm OD CF flange with 25mm clear bore and single 34mm OD CF pumping port on the base flange. The DPRF25 allows for a small cryostat or cold finger to be inserted and continuously rotated within the vacuum chamber without effect on the ambient chamber pressure. A high capacity load permits up to 80kg pay loads to be tolerated. PTFE seals can be replaced upon maintenance service intervals to prolong the life of the rotary feedthrough.

Key Features

Continuous Rotation into the Chamber

360° Rotation

25mm Clear Bore

Mounted on 70mm OD CF Flange

High Maximum Load Capacity

80kg Axial Load and 9 Nm Axial Load

Replaceable PTFE Seals

Serviceable In The Field

Fully Bakeable to 230°C

With Motors Removed

Leak Rate

1x10-10 mbar l/s -1

Maximum Rotation Speed


Interspace Pumping

Single 34mm OD CF Pumping Port

Information Table


DPRF25 with Actuation Options

Flange OD mm Actuation Method Resolution Degrees ° Max Rotation Speed RPM Rotation Torque Nm Maximum Axial Load Kg Bakeout Temperature Order Code
70 Manual 2 - 4 80 230°C ZDPRF25
70 High Precision Hand Wheel 0.05 1.5 0.2 80 230°C ZDPRF25H
70 Stepper Motor 0.01 3.0 - 80 *230°C ZDPRF25W
70 Encoded Stepper Motor 0.01 3.0 - 80 *230°C ZDPRF25E
70 DC Motor - 3.0 - 80 *230°C ZDPRF25D

*230°C with motors removed

DPRFs should be connected to the system or stand alone pump, and should be pumped all the time the system is being pumped.