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Rotorseal Type


Number of Passages


Inlet Port Thread (O)


Hose Used In All Arrangements


Insulating Coupling


Quick Release Valve


Assembly with Insulating Coupling


Assembly with Insulating Coupling & QRV


Mounting Size Thread


Dimension D

3.70|3.38 in
94|86 mm

Dimension D1

2.25|2.53 in
64|57 mm

Dimension H

1.63 in
41 mm

Dimension L2

0.75 in
19 mm

Dimension O

0.50|3/8-18 in
13|3/8-18 mm

Dimension O1


Dimension U1

15.3 in
389 mm

Dimension U2

1.7 in
43 mm

Dimension U3

14.5 in
368 mm

Dimension U4

12.5 in
318 mm

Passage Area

0.111 in²
0.72 cm²

Hex Size

0.875 in
22.2 mm

Dimension D2

0.50 in
13 mm

Dimension M

0.56 in
14 mm

Dimension N

0.36 in
9 mm

Maximum Speed

600 rpm

Maximum Pressure

1000 psi
69 bar

Dimension H2


Dimension J1


Dimension L


Dimension U5



0.6 lb
0.3 kg

General Description

The rotating seal is established by a non-metallic sealing ring, held against the rotorseal shaft by a light spring force. The sealing ring is designed so that media pressure acts on both of its ends to minimize the force on the sealing surface.
This design gives positive protection against leakage and compensates for seal wear. Ball bearings are used between the stationary and rotating ports to provide rigidity to the rotorseal assembly and to minimize the running torque.
Rotorseals are available with single, dual and triple passages, in a variety of sizes and designs, to provide the versatility needed to handle most requirements. Single passage rotorseals, in pneumatic installation, can be plumbed with a quick release valve at its inlet port to provide a convenient exhaust.
In most applications, the rotorseal is mounted to the end of a shaft. The shaft is rifle and cross drilled to provide a passageway for the media transmitted. It is important that the rotorseal’s axis of rotation be concentric with the rotating member’s axis of rotation to minimize rotorseal wobble.
To accommodate eccentricities, a flexible connection must be used between the rotorseal and supply. A rigid connection will tend to preload the rotorseal bearings. The flexible connection should not be installed taut and should include a union and 45º elbow.
The flexible connection should be attached to the rotorseal prior to fastening the rotorseal to the rotating body to avoid seal or bearing damage. The union connection to the supply line is made last.In most applications, only one fluid is to be transmitted to a rotating assembly. This group of rotorseals will handle most medium volume, single passage requirements. External threads on the seal shaft and standard pipe threads on the inlet port make installations an easy job.




Operation at maximum pressure and speed should be avoided. Refer to K-14 for operating parameters.