Information

What is a Rotary Union? Multi pass rotary union is a mechanism used to transfer liquid under pressure or vacuum from a stationary inlet to a rotating outlet, preserving and isolating the liquid connection.

Multi pass rotary unions are designed to satisfy a wide range of temperatures and pressures for a variety of conditions and environments. In addition, rotary unions are capable to different types of liquids simultaneously.

Overview - The multi pass rotary unions are available in 2, 4, 6, 8, 10 and 12 passage as standard configuration, with different models for your specific requirements contact us. The multi pass rotary unions feature specialized sealing technology suitable for vacuum and bidirectional pressures and independent flow passages capable of transferring different media or liquids simultaneously.

The alloy steel construction suitable for air, water, steam, gas, coolant and hydraulic media. Stainless steel models can be made available to prevent corrosion for use with applications requiring corrosive media transfer.

Standard models with 2, 4, 6 8, 10 or 12 flow passages with standard NPT thread connections. For specific requirement O-ring face seal mounting, metric threads or other type threads connections can be supplied to your requirement.    

For selection of multi pass rotary union send your enquiry with required details in our enquiry format to us, our technical team will do proper selection and send to you.

Working principle / specification

Installation & Mounting PREPARATION: Remove the rotary union from the shipping package, Inspect the entire assembly, including all passage connections to make sure that they are clean, and no visual damage occurred during transit. 

RECOMMENDED INSTALLATION PRACTICE: PRS Verse does not recommend mounting the rotary union with both the shaft & housing components solidly bolted into place. One of the two components should be mounted in a manner that allows for some movement in the event of misalignment or run out during rotation. Using only the supply lines or hoses to fix the stationary component in place is also not recommended. An anti-rotation arm that attaches to the stationary part of the rotary union assembly and rests against part of the equipment framework is recommended.

Shaft Mounting - When mounting the shaft using threaded connections, make sure all fittings are properly tightened, and necessary thread sealant is applied as required. Equipment mounting surface needs to be concentric to the center line of the rotary union shaft to assure proper function. 

Housing Mounting – When mounting over the housing to secure the union into a piece of equipment, bolt the assembly into place using the tapped holes on the back of the housing.

Initial start - After rotary union is installed, a dry run is recommended to assure proper mounting of the rotating union assembly. Begin rotation of the equipment, and verify that while rotating at the maximum operating speed there is no visible movement of the rotary union assembly due to misalignment.