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"8000 Series" Rotary Union

Model:  8000 Series / SRU-4091

Type
Options
Spring
Part N° Description Nominal Pipe Size (A) Inlet (B) Guide Price Quantity
4091-T22187
430483C
L8200P 1/2 1/2 Quote Required
4091-T22188
430485C
L8300P 3/4 3/4 Quote Required
4091-T22189
730856C
L8400-T 1 1 Quote Required
4091-T22190
430489C
L8500P 1-1/4 1-1/4 Quote Required
4091-T22191
730496C
L8600P 1-1/2 1-1/2 Quote Required
4091-T22192
460617C
L8700P 2 2 Quote Required
4091-T22193
430495C
L8800P 2-1/2 2 Quote Required
4091-T22194
430497C
L8900P 3 2-1/2 Quote Required
4091-T22195
430501C
L81100P 4 4 Quote Required
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Rotary union designed ideally for operation in a variety of steam applications.

8000 Series Rotary Union

8000 Series Rotary Union

Features and Benefits

  • Ideal for steam applications - designed for operation in a variety of steam applications.
  • Safety - An anti-torque lug prevents rotation of the housing while in operation.
  • No lubrication needed - The special carbon graphite bearing is lubricated by the process fluid and requires no additional lubrication.
  • Hot oil applications - 8000HO offers the same design features as the standard 8000 series but with a special high temperature seal ring for hot oil applications.
  • Stainless steel insert - The stainless steel housing insert in the 8000T Series makes this joint a favourite in the texting industry.

8000 Series Rotary Union Mono Flow Dimensional Diagram (inches)

8000 Series Rotary Union Mono Flow Diagram
Nominal Pipe Size (A) Inlet B (NPT) F E G Overall Length (C) W Z O
1/2 1/2 2-1/2 2-1/8 2 6-1/4 4-7/16 1-5/8

15/32

Quick Release
3/4 3/4 2-1/2 2-3/16 2-3/8 6-3/8 4-11/16 1-13/16 15/32
Quick Release
1 1 2-3/4 2-5/16 2-5/8 7-1/8 4-7/8 1-7/8 15/32
Quick Release
1-1/4 1-1/4 3-3/16 2-1/2 3 8-1/8 5-5/8 2-1/8 5/8
Quick Release
1-1/2 1-1/2 3-3/4 2-1/2 3-1/2 8-13/16 6 2-7/8 5/8
Quick Release
2 2 4 2-9/16 4 9-1/2 6-9/16 3-1/8 5/8
Quick Release
2-1/2 2-1/2 5-3/16 3-3/16 4-7/16 10-7/8 8 3-9/16 11/16
Quick Release
3 3 5-3/4 3-5/8 4-9/16 12-3/16 8-1/2 3-31/32 7/8
Quick Release
4 4 8-1/8 5-7/16 6-5/16 16-7/8 13-1/2 5-1/8 1-3/32
Quick Release

8000 Series Rotary Union Dual Flow Dimensional Diagram (inches)

8000 Series Rotary Union Dual Flow Diagram
Nominal Pipe Size (A) Inlet B (NPT) Outlet J (NPT) Siphon Tap K (NPSM) C F E G S W Z O H
1/2 1/2 1/2 1/8 7-1/2 2-1/2 2-1/8 2 6-1/16 4-7/16 1-5/8 15/32 2-1/4
3/4 3/4 1/2 1/4 7-11/16 2-1/2 2-3/16 2-3/8 6-1/4 4-11/16 1-13/16 15/32 2-5/16
1 1 1/2 3/8 8-3/4 2-3/4 2-5/16 2-5/8 6-15/16 4-7/8 1-7/8 15/32 2-5/8
1/2 1/4
1-1/4 1-1/4 1/2 1/2 9-1/4 3-3/16 2-1/2 3 7-7/8 5-5/8 2-1/8 5/8 3-1/8
1-1/2 1-1/2 3/4 3/4 10-3/8 3-3/4 2-1/2 3-1/2 8-5/8 6 2-7/8 5/8 3-9/16
2 2 1 3/4 11-11/16 4 2-9/16 4 9-1/2 6-9/16 3-1/8 5/8 4
2-1/2 2 1-1/4 3/4 14-1/8 5-3/16 3-3/16 4-7/16 11-1/4 8 3-9/16 11/16 5-1/16
1
1-1/4
3 2-1/2 1-1/4 1 17 5-3/4 3-5/8 4-9/16 12-1/2 8-1/2 3-31/32 7/8 5-9/16
1-1/4 1-1/4
1-1/2 1-1/2
4 4 2-1/2 2 24-1/4 8-1/8 5-7/16 6-5/16 18-1/8 13-1/2 5-1/8 1-3/32 7-3/4

8000 Series Rotary Union Mono Flow Specifications

Nominal Pipe Size (A) Inlet (B) Left Hand Thread Right Hand Thread Quick Release
Standard Spring Description Heavy Duty Spring Description Standard Spring Description Heavy Duty Spring Description Standard Spring Description Heavy Duty Spring Description
1/2 1/2 430483C L8200P 730215C L8200P-HD 430484C R8200P 730216C R8200P-HD 430533C Q8200P  730214C Q8200P
3/4 3/4 430485C L8300P 730223C L8300P-HD 430486C R8300P 730224C R8300P-HD 730534C Q8300P  730225C Q8300P
1 1 730856C L8400-T - - 730857C R8400-T - - 430535C Q8400P  730232C Q8400P
1-1/4 1-1/4 430489C L8500P 730244C L8500P-HD 430490C R8500P 730245C R8500P-HD 430536C Q8500P  730246C Q8500P
1-1/2 1-1/2 730496C L8600P 730506C L8600P-HD 730497C R8600P 730507C R8600P-HD 730498C Q8600P  430508C Q8600P
2 2 460617C L8700P 730269C L8700P-HD 460618C R8700P 730270C R8700P-HD 460616C Q8700P  730271C Q8700P
2-1/2 2 430495C L8800P 730278C L8800P-HD 430496C R8800P 730279C R8800P-HD 430539C Q8800P  730280C Q8800P
3 2-1/2 430497C L8900P 730290C L8900P-HD 430498C R8900P 730291C R8900P-HD 430540C Q8900P  730292C Q8900P
4 4 430501C L81100P 730322C L81100P-HD 430502C R81100P 730323C R81100P-HD 430542C Q81100P  730324C Q81100P

8000 Series Rotary Union Dual Flow Specifications

Nominal Pipe Size (A) Inlet (B) Right Hand Thread Left Hand Thread Quick Release
Standard Spring Description Heavy Duty Spring Description Standard Spring Description Heavy Duty Spring Description Standard Spring Description Heavy Duty Spring Description
1/2 1/2 430504C R8200S 730219C R8200S-HD 430503C L8200S 730218C L8200S-HD 430543C Q8200S 730217C Q8200S-HD
3/4 3/4 430506C R8300S 730227C R8300S-HD 430505C L8300S 730226C L8300S-HD 430544C Q8300S 730228C Q8300S-HD
1 1 730859C R8400S-T - - 730858C L8400S-T - - 430545C Q8400S 730238C Q8400S-HD
730861C XR8400S-T - - 730860C XL8400S-T - - 430546C XQ8400S 730235C XQ8400S-HD
1-1/4 1-1/4 430512C R8500S 730248C R8500S-HD 430511C L8500S 730247C L8500S-HD 430547C Q8500S 730249C Q8500S-HD
1-1/2 1-1/2 730500C R8600S 730523C R8600S-HD 730499C L8600S 730522C L8600S-HD 730501C Q8600S 730524C Q8600S-HD
2 2 460648C R8700S 730273C R8700S-HD 460647C L8700S 730272C L8700S-HD 460595C Q8700S 730274C Q8700S-HD
2-1/2 2 430520C R8800S 730285C R8800S-HD 430517C L8800S 730284C L8800S-HD 430550C Q8800S 730286C Q8800S-HD
430521C R8800S 730282C R8800S-HD 430518C L8800S 730281C L8800S-HD 430551C Q8800S 730283C Q8800S-HD
430522C R8800S 730288C R8800S-HD 430519C L8800S 730287C L8800S-HD 430552C Q8800S 730289C Q8800S-HD
3 2-1/2 430256C R8900S 730296C R8900S-HD 430523C L8900S 730293C L8900S-HD 430553C Q8900S 730299C Q8900S-HD
430527C R8900S 730297C R8900S-HD 430524C L8900S 730294C L8900S-HD 430554C Q8900S 730300C Q8900S-HD
430528C R8900S 730298C R8900S-HD 430525C L8900S 730295C L8900S-HD 430555C Q8900S 730301C Q8900S-HD
4 4 431532C R81100S 730326C R81100S-HD 430531C L81100S 730325C L81100S-HD 430557C Q81100S 730327C Q81100S-HD
Rotary Union Design

Rotary Union Design

While rotating joints come in many shapes, sizes, and configurations, they always have the same four basic components: housing, a shaft, a bearing (or bearings) and a seal.

Mechanical Seal

The heart of the Rotary Union or rotary joint is the seal.

The seal prevents the medium (water, oil, air, etc) from leaking outside the Rotary Union while the Rotary Union is in operation.

Duff-Norton uses four basic types of mechanical seals in its Rotary Unions: 1) pusher-type end face mechanical seal, 2) non-pusher type end face mechanical seal, 3) lip seals and 4) o-ring seal. Rotary Unions may have more than one seal.

Bearing

The second most important part of the Rotary Union is the bearing. A Rotary Union may have only one bearing or multiple bearings.

Roller bearings, such as ball bearings and tapered roller bearings, or non-roller bearings, like graphite bearings and bronze bushings, may be used in the Rotary Union.

The bearings are always used to allow a part of the joint, either the shaft or the housing, to rotate.

Shaft

The shaft is the component that carries the medium through the Rotary Union into the drum or roll. In many cases, the shaft will turn with the drum or roll. In some cases, like in larger flanged rotary Unions, the shaft may be stationary while the housing rotates. The bearings and seal are typically assembled around the shaft.

Housing

The housing is the component that holds all of the other elements of the Rotary Union together. The housing has an inlet port, which is a threaded port to which the hose supplying the medium will be attached .

The Rotary Union may also have an outlet port, if the same joint is being used both to supply fluid to a roll and to remove fluid from the roll. In smaller Rotary Unions, the housing is stationary. In larger Rotary Unions, the housing maybe bolted to the drum or roll using a flange. In these cases, the housing rotates at the same speed as the drum.


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