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rotary unionS

design capabilities

circuits

  • SAE ORB, BSPP, 4-bolt flange, and NPT
  • Up to 7,500 PSI
  • Media types: oil/hydraulic, air/gas, and coolant
rotary union ports
UEA rotary union

enclosed specs

  • 20-2,000 lbs
  • Alloy steel, ductile iron, and stainless
  • Custom mounting brackets and post welding machining
  • Nickel plating, painting, and heat treatment
  • Designs for high vibration
  • Temperature range: -40-250°F+

seals

UEA uses hydraulic rotary seal technology that provides a lubricated polymer blend of material. It is extremely extrusion resistant, non-aggressive to the mating dynamic metal surfaces, offers long term performance, lower cost and has a proven successful track record in demanding field applications for well over a decade.

ENERGIZER

  • Square ring AN11 70A NBR
  • Helps cap seal create a positive seal within its groove

U-cup

  • One on each end of swivel prevents external oil leakage
  • U-Cup seals are wider on one end and are tapered back. The wide end is installed facing toward the inside of the swivel.

cap seal

  • Good extrusion resistance (without degradation)
  • Non-aggressive to mating surfaces (won’t create wear path damage)
  • Side wall notches for increased shifting speed within seal groove
  • Wide temperature range (-40° F to 200° F)
  • High precision lathe cut seals of a lubricated polymer blend
  • OD and ID dynamic styles

wear ring

  • Acts as a bearing surface to prevent spool and housing from metal to metal contact

Excluder Seal

  • Acts as a dust and debris seal to shield ingress of outside contaminants

Thrust Washer

  • Acts as a bearing surface for thrust loads
rotary union size

ROTARY UNION SIZE

UEA can produce a large variety of rotary union sizes to meet various needs and applications. Factors that dictate rotary union size: center through-hole size; a liquid tight cord grip; the number, pressure rating, and size of ports; and 4-Bolt flange ports vs. SAE ORB ports.

Small Rotary Unions

  • Internal bore diameter: 3“ to 5”
  • Overall length: 6” to 14”
  • Number of passages: 2 to 6

medium Rotary Unions

  • Internal bore diameter: 5“ to 7”
  • Overall length: 14” to 30”
  • Number of passages: 6 to 12

large Rotary Unions

  • Internal bore diameter: 7“ and up
  • Overall length: 30” and up
  • Number of passages: 12 and up

media

Nearly any non-flammable media can be sent through a rotary union. Examples include:
  • Hydraulic oil
  • Engine Coolant
  • R124A Refrigerant
  • Air
  • Fuels
rotary union testing

learn more about our ROTARY UNIONS

MACHINING AND
DESIGN tECHNOLOGY

CLEAN ROOM
ASSEMEBLY

ENDURANCE
TEST STAND

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