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"1700 Series" Rotary Union High Pressure Swivel

Model:  1700 Series / SRUH-4131

Part N° Description Nominal Pipe Size (DN) (inch) Shaft thread (A) Maximum Pressure (PSI) Overall Length (F) Overall Diameter (I) Guide Price Quantity
4131-T21948
750788C
R1813SRKNPT 1/4 1/4 5,075 2-5/8 1-1/4 Quote Required
4131-T21949
750789C
R1817SRKNPT 3/8 3/8 5,075 2-3/4 1-1/2 Quote Required
4131-T21950
750790C
R1821SRKNPT 1/2 1/2 4,350 3-1/8 2-1/16 Quote Required
4131-T21951
750791C
R1827SRKNPT 3/4 3/4 4,350 3-1/2 2-1/4 Quote Required
4131-T21952
750792C
R1834SRKNPT 1 1 3,625 3-3/4 2-1/2 Quote Required
4131-T21953
750793C
R1842SRKNPT 1-1/8 1-1/4 3,625 4-1/8 3 Quote Required
4131-T21954
750794C
R1849SRKNPT 1-1/2 1-1/2 2,900 4-9/16 3-3/8 Quote Required
4131-T21955
750795C
R1860SRKNPT 1-3/4 2 2,900 4-13/16 4 Quote Required
4131-T21956
750796C
R1876SRKNPT 2-1/4 2-1/2 2,175 5-1/2 5-1/8 Quote Required
4131-T21957
750797C
R1890SRKNPT 2-3/4 3 2,175 7-1/8 6-1/8 Quote Required
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High pressure corrosion resistant rotary union with the option of stainless steel construction.

1700 Series

1700 Series Rotary Union High Pressure Swivel

Features and Benefits

  • High Pressure Applications - For use in hydraulic and pneumatic applications.
  • GR Seal Technology - Equipped with a GR Seal, which is suitable for most fluids.
  • Corrosion Resistant - Standard models feature nickel treated carbon steel construction, but are also available in all stainless steel.
  • Thrust Bearings - A single acting thrust bearing permits slow rotation at high pressures.

1700 Series High Pressure Swivel Rotary Union Diagram

1700 Series High Pressure Swivel Rotary Union Diagram
Nominal Pipe Size (DN) Shaft Thread (A) B C Overall Length (F) G Flats (H) Overall Diameter (I)
1/4 1/4 1/2 7/16 2-5/8 1-3/4 1/2 1-1/4
3/8 3/8 1/2 1/2 2-3/4 1-15/16 1/2 1-1/2
1/2 1/2 5/8 9/16 3-1/8 2-3/16 3/4 2-1/16
3/4 3/4 3/4 5/8 3-1/2 2-1/2 1 2-1/4
1 1 7/8 3/4 3-3/4 2-9/16 1-1/4 2-1/2
1-1/8 1-1/4 1 3/4 4-1/8 2-3/4 1-1/2 3
1-1/2 1-1/2 1 3/4 4-9/16 3-1/8 1-3/4 3-3/8
1-3/4 2 1-1/8 1 4-13/16 3-1/4 2-1/4 4
2-1/4 2-1/2 1-1/8 1 5-1/2 3-3/4 2-3/4 5-1/8
2-3/4 3 1-1/4 1-1/8 7-1/8 4-13/16 3-3/8 6-1/8

1700 Series Rotary Union High Pressure Swivel Specifications

Nominal Pipe Size (DN) (inch) Shaft thread (A) Part Number Description Maximum Pressure (PSI)
1/4 1/4 750788C R1813SRKNPT 5,075
3/8 3/8 750789C R1817SRKNPT 5,075
1/2 1/2 750790C R1821SRKNPT 4,350
3/4 3/4 750791C R1827SRKNPT 4,350
1 1 750792C R1834SRKNPT 3,625
1-1/8 1-1/4 750793C R1842SRKNPT 3,625
1-1/2 1-1/2 750794C R1849SRKNPT 2,900
1-3/4 2 750795C R1860SRKNPT 2,900
2-1/4 2-1/2 750796C R1876SRKNPT 2,175
2-3/4 3 750797C R1890SRKNPT 2,175

1700 Series High Pressure Swivel Rotary Union Performance Charts

1700 Series High Pressure Swivel Rotary Union Performance Charts
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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