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Glossary of Terms

 

General Terms

1 Passage Union

A rotating union that allows fluid flow in only one direction (also known as Monoflow).

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4 Passage Union

A rotating union that has four passages and may allow multiple fluids at multiple pressures for multiple purposes.

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Air or Pneumatic Union

A mechanical device used to transmit air from a stationary source into a rotating machine to transmit fluid power.

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Balanced Mechanical Seal

It is a type of Mechanical Seal where by employing steps and shoulders into appropriate seal components, the thrust load and the seal contact pressure is kept to a minimum.  This reduces friction and wear resulting in long service life of the Rotating Union. 

Most Mechanical Seals in Deublin Rotating Union are Balanced Mechanical Seals.

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Ball Bearing

One of the key components of a Rotating Union that allows rotation of the rotor relative to the Housing.  Ball Bearings are mounted on the rotor, supports the weight of the Housing and supply/return connections of the media.

In most applications, one race is stationary and the other is attached to the rotating assembly.

As one of the bearing races rotates it causes the balls to rotate as well.   Because the balls are rolling they have a much lower coefficient of friction than if two flat surfaces were sliding against each other.

Typically Ball Bearings require external grease and may require periodic relubrication.  Due to fits, clearances, varying expansion rates and grease property maximum temperature limit of bearings are critical limitations and are not to be exceeded.  For most Rotating Union utilizing Ball Bearings, the maximum temperature of the Rotating Union is related to the maximum temperature of the Ball Bearings.

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Bushing Bearing

Same as Sleeve Bearing. 

One of the key components of a Rotating Union that allows rotation of the rotor relative to the Housing.  Bushing Bearings are typically mounted in the Housing, supports the weight of the Housing and supply/return connections of the media.

Bushing Bearings utilize self-lubricating material and therefore do not require periodic relubrication.  They may be suitable for applications beyond the temperature limit of Ball Bearings.  However, due to the large contact surface area, the torque is high and the maximum speed limit is typically quite low.

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Cartridge Assembly

Also known as Seal Cartridge

Consists of Mechanical Seal, soft seal spring and all wearing components in a preassembled cartridge to allow ease of servicing of Rotating Unions.

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C-Ring

It is a type of a Secondary Seal to seal between the Floating Seal and the Housing.  It is in the shape of a “C” and is usually spring energized.  Typically C-Rings have higher temperature limits than O-Rings. 

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Dryer Bars

Also known as Turbulence Bars.

It is a set of longitudinal bars installed inside a rotating Dryer to break-up the riming condensate layer to enhance heat transfer into the Dryer shell.

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Duoflow

A two-passage union that allows fluid flow in and out through the same union, typically used for heating or cooling purposes.

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Duoflow Assembly

Typically an Elbow with attachment hardware, soft seals and supply tube to convert a Monoflow Rotating Union into a Duoflow Rotating Union.

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E.L.S. for 55/57 and 6000 Series Unions

E.L.S. stands for Extended Life Seals. Depending upon union model, it may be Tungsten Carbide/Ceramic, Silicon Carbide/Silicon Carbide or a varity of other hard seal face combinations. E.L.S. unions are suitable for unfiltered media due to their resistance to abrasion and wear that may be caused by suspended particulates in the media.

E.L.S. is a preset seal combination by Model and it is not user selectable.

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Elbow

Is a component in the shape of an Elbow.  Many Monoflow Deublin Unions may be converted into a Duoflow Union by attaching an Elbow at the end of the Housing.

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Flange

Adaptive hardware that allows installation of a rotating union onto a machine roll without any threads.  Flanged rotating unions are equally suitable for bi-directional rotation.

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Flange Assembly

Includes Flange plus hardware and soft seals.

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Floating Seal

The stationary part of the Mechanical Seal held stationary in the Housing by some anti-rotation means such as pins or keys.  By definition floating seals float and maintain continuous contact with the Rotor Seals during operation to provide leak-free sealing as the media is being transmitted through the Rotating Union.

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Gasket

It is a seal made of flexible material which fills the space between two or more mating surfaces to prevent leakage while under compression. 

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Housing

Housing is the key stationary component of a Rotating Union.  It contains the stationary part of the Mechanical Seal (where applicable).  The supply connections of the fluid are usually attached to the Housing.  For In-the-Shaft Mounted unions, the Housing rotates.

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Hydraulic Union

A mechanical device used to transmit hydraulic fluid from a stationary source into a rotating machine to transmit fluid power.

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IC Drawing

An abbreviation for Interface Control Drawing.  The drawing shows all external dimensions and the required fitting dimensions required to interface and fit onto the customer’s equipment

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Mechanical Seal

The preferred sealing technology used by Deublin.  It consists of lapped seals, soft seals, springs and additional components to provide sealing as a fluid is being transmitted from a stationary source into a rotating machine.  One of the seal face is always stationary while the other seal face rotates.  Primary sealing is accomplished at the rubbing surfaces of the two seals.  All wear of a Mechanical Seal is internally compensated.  The wearing parts may move relative to one another but there may not be any axial movement of the Housing relative to the rotor.

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Monoflow

A one-passage union that allows fluid flow in only one direction.

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Multi-Passage Union

A rotating union that has multiple passages and may allow multiple fluids at multiple pressures for multiple purposes.

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O-Ring

It is a mechanical gasket in the shape of an “O”; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface.

The O-ring may be used in static applications for Floating Seal or in dynamic applications where there is relative motion between the parts and the O-ring.

O-rings are one of the most common seals used in Rotating Union because they are reliable, and have simple mounting requirements.

O-Ring is a very common Secondary Seal to seal between the Floating Seal and the Housing.

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Pressure-Type Joint

It is a type of sealing mechanism suitable mostly for steam and hot oil and utilizes either Bushing Bearings or external brackets or rods to support the Housing. Due to the nature of design, there is no hydraulic balance between the internal sealing components and thus the contact pressure at the sealing surface is usually high.  Since the system pressure of these type of applications is not high, use of pressure type sealing technology is quite acceptable to a certain limit after which consideration should be given to Balance Mechanical Seal technology.

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PTFE Wedge

It is a type of a Secondary Seal to seal between the Floating Seal and the Housing.  It is in the shape of a wedge and made of PFTE.  Typically PTFE  Wedges have higher temperature limits than O-Rings. 

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Repair Kit

Same as Service Kit

Component parts necessary to service a rotating union where all soft seals and Mechanical Seal faces are user replaceable.

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Rebuild Kit

Same as Service Kit Plus

Service Kit plus rotor assembly with seal and bearings.  Essentially the kit includes all component parts except the Housing.

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Rotary Union

A mechanical device used to transmit pressurized media from a stationary source into a rotating machine to heat, cool or transmit fluid power.

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Rotating Joint

A mechanical device used to transmit pressurized media from a stationary source into a rotating machine to heat, cool or transmit fluid power.

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Rotating Siphon

Type of Siphon that rotates with the roll or dryer and is used for evacuating condensate in a steam heated system, or heat transfer fluid from the machine roll.

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Rotating (Duoflow) Pipe

Type of Duoflow Pipe that rotates with the roll. It is used for either supply or return of the media, typically for heating or cooling applications.

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Rotating Union

A mechanical device used to transmit pressurized media from a stationary source into a rotating machine to heat, cool or transmit fluid power.

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Rotor

The key rotating union component that rotates with the machine roll.  Rotors are attached by threaded or flanged connections.  For In-the-Shaft Mounted unions, because of the reverse mounting orientation, the rotor is usually stationary and the Housing rotates with the roll.

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Rotor Assembly

Typically includes bonded Mechanical Seal face and/or additional components that require assembly by Deublin.

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Rotor Seal

The mating Mechanical Seal face that is either permanently or flexibly attached to the rotor.

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Seal Cartridge

Also known as Cartridge Assembly

Consists of Mechanical Seal, soft seals, spring and all wear components in a preassembled cartridge to allow ease of servicing of rotating unions.

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Secondary Seal

It is a flexible sealing component that is used to seal between the Floating Seal and the Housing.  It may be an O-Ring, C-Ring or a variety of material.  The type of Secondary Seal is dictated by the Union design and application parameters.  

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Service Kit

Component parts necessary to service a rotating union where all soft seals and Mechanical Seal faces are user replaceable.

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Service Kit Plus

Service Kit, plus rotor assembly with seal and bearings.  Essentially the kit includes all component parts except the Housing.

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Sleeve Bearing

Same as Bushing Bearing. 

One of the key components of a Rotating Union that allows rotation of the rotor relative to the Housing.  Sleeve Bearings are typically mounted in the Housing, supports the weight of the Housing and supply/return connections of the media.

Sleeve Bearings utilize self-lubricating material and therefore do not require periodic relubrication.  They may be suitable for applications beyond the temperature limit of Ball Bearings.  However, due to the large contact surface area, the torque is high and the maximum speed limit is typically quite low.

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Slinger

Typically it consists of two components, one rotating and one stationary in close proximity to prevent ingress of media into the bearings, thereby prolonging the bearing life and thus the service life of the Rotating Union.

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Snap Ring

A  type of fastener consisting of a semi-flexible metal ring with open ends which can be snapped into place, into a machined groove on a rotor or in the Housingto permit rotation but to prevent axial movement. There are two basic types: internal and external, referring to whether they are fitted into a Housing or on a shaft. 

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Spirolox

It is a retaining ring available exclusively from Smalley.  Spirolox Retaining Rings have no ears to interfere with mating components.

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Spring

It is an elastic object used to store mechanical energy and usually made out of spring steel.

When a spring is compressed or stretched, the force it exerts is proportional to its change in length.

Most Mechanical Seals require Springs for initial mechanical loading of the Floating Seal.  Deublin uses mostly two types of Springs, Coil Spring and Wave Spring.  Spring types are selected based on axial space and loading requirements.  Springs may also be used to pre‑load certain types of Ball Bearings.

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Standard Repair

Repair Service by Deublin where all wearing components are replaced and the Rotating Union is restored to factory specifications. 

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Standard Seals for 55/57 and 6000 Series Unions

Standard Seals consist of a softer sacrificial seal, sealing against a hard seal such as Carbon Graphite/Bronze, Carbon Graphite/Silicon Carbide, Carbon Graphite/Ceramic, Carbon Graphite/Tungsten Carbide, etc.

Standard Seals are preset combinations by Model and are not user selectable.

Standard Seals should be the preferred seal unless the media is unfiltered. For unfiltered media, E.L.S. is recommended.

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Standard Repair Plus

Repair Service by Deublin where all wearing components plus the Housing or the Rotor are replaced and the Rotating Union is restored to factory specifications. 

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Stationary Siphon

Type of Siphon that is rigidly attached to the Steam Joint and is used for evacuating condensate in a steam heated system.

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Stationary Supply Pipe

Type of Supply Pipe that is rigidly attached to the Rotating Union. It is used for either supply or return of the media, typically for heating or cooling applications.

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Steam Fit

Also known as Steam Joint.

Type of Rotating Union used for transmitting steam to heat cylinders or dryers typically for Paper and Corrugating Industries.  Usually if steam is used as a heating media a Siphon of some sort is required to drain or evacuate the condensate.  Siphons may be rotating or stationary.

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Steam Head

Also known as Steam Joint.

Type of Rotating Union used for transmitting steam to heat cylinders or dryers typically for Paper and Corrugating Industries.  Usually if steam is used as a heating media a Siphon of some sort is required to drain or evacuate the condensate.  Siphons may be rotating or stationary.

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Steam Joint

Type of Rotating Union used for transmitting steam to heat cylinders or dryers typically for Paper and Corrugating Industries.  Usually if steam is used as a heating media a Siphon of some sort is required to drain or evacuate the condensate.  Siphons may be rotating or stationary.

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Swivels

Similar to a Rotating Union except the machine movement could be occasional, intermittent and/or oscillating.  Typically Swivels can transmit high pressure media and there is never any continuous rotational motion.

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Turbulence Bars

Also known as Dryer Bars.

It is a set of longitudinal bars installed inside a rotating Dryer to break-up the riming condensate layer to enhance heat transfer into the Dryer shell.

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Unfiltered Media

Unfiltered Media is media that does not have any filtration incorporated into the circulating system.  This type of media may cause abrasion and wear on seals.  To extend service life of the union, E.L.S. is recommended.

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Unions

Also known as Rotating Union, Rotary Union, Rotating Joint, Hydraulic Union

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Welcome to Deublin.com!

Since 1945, Deublin has grown from a small garage shop to the world’s largest manufacturer of rotary unions (rotating unions). Our worldwide distribution network allows OEM’s all over the world to specify Deublin rotary unions when purchasing equipment made in another country. Wherever you’re located, Deublin has a stocking distributor nearby to meet your fluid handling requirements—quickly. Rotary unions must accommodate a broad range of materials, viscosities, temperatures, pressures and speeds. That’s why the Deublin rotary union product line offers over 500 standard rotary unions, over 3,000 separate models, and more than 6,000 individual components to handle them.

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