What Are Rotary Unions?

A mechanism used to transfer fluid (under pressure or vacuum) from a stationary inlet to a rotating outlet, preserving and isolating the fluid connection is known as a rotary union or swivel joint. Rotary unions are designed to tolerate a large range of temperatures and pressure for an assortment of environments and conditions. In addition, they may integrate multiple independent flow connections while handling different types of media.

rotary unionsRotary unions function by attaching to an input and connecting onto another mechanism while allowing a moving connection to be preserved. They are utilized in a variety of applications; from compact unions for the semiconductor industry to large, rugged-duty fluid swivels for industrial applications. Additionally, a variety of materials, sealing technology, and bearing types can be incorporated for usage as well.




A rotary union comes in many different styles and types offering the following features:

High pressure
High flow volume
SAE Connections
Large flow passages
CIP compatible
Single passage
Tri-Clamp connections
Low Torque Seals
Compact designs
Lightweight construction
General purpose
Stainless steel

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Protect Your Workers with Dry Disconnect Couplings

When it comes to protecting your employees and the environment during the transfer of hazardous materials, dry disconnect couplings cannot be outdone. What we carry are the standard of the industry. Our Kamvalok dry disconnect couplings are suitable for a large range of liquid applications whether corrosive, caustic, toxic or in any other way harmful and ensure against spillage during the connection and disconnection process.
dry disconnect couplings
These couplings are widely used by manufacturers of such products as paint, inks, lacquers, adhesives, pharmaceuticals, fatty acids, liquid soaps and more. Particularly well suited for handling vegetable oils, petroleum products, ag-chemicals, solvents, detergents and many acids and caustics these couplings can be counted on for safety.

Benefits of the dry disconnect couplings include:
No Accidental Spills – The poppeted seal cylinder with snap-on nose seal provides automatic closure from both directions to prevent accidental spills.
Controlled Lever Action – The open/close lever action ensures that liquid flow can only begin after the coupling and adaptor are coupled securely.
Easy to Use – The simple design and lever actuated internal poppet configuration makes this the first choice for liquid transfer.
Closed-Loop Loading Capabilities – Keep hazardous liquids and vapors in-line and out of the environment.
Locking Arms – Autolok™ locking arms with an automatic locking mechanism signaled by a positive click. Uncoupling requires only an easy tug on the lock release.

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Kamvalok Coupler Transport Series

We carry a full range of connections, including quick disconnect couplings and dry disconnect couplings, that will surely meet your application needs. When you choose a Kamvalok coupler you’re choosing quality workmanship and guaranteed performance. The Kamvalok coupler can be counted on to reduce the hazards involved in transference of hazardous materials.

Kamvalok couplerThe Kamvalok Transportation Coupler, shown here, is part of the transport series of couplers that we carry. These are considered the standard in the industry for use on multi-compartment petroleum, chemical and solvent product delivery trucks using an on-board pumping unit.

Benefits of this transportation coupler include:
Ease of Use – The design and lever actuated internal poppet configuration provides easy connection and disconnection during liquid transfer operations.
Spill Protection – Reduces the likelihood of spills during the connection and disconnection process when transferring materials.
Environmental Protection – When used with the Vapor Recovery Dry Disconnect Coupling the people and property are protected from exposure by keeping hazardous liquids and vapors in-line.
Autolok Locking Arms – This automatic locking mechanism provides added protection when using couplers.
Dual Protection – Kamvaloks provide automatic closure from two directions – the coupler and the adaptor.

You can be assured that the transportation coupler is manufactured in compliance with the highest quality standards of design, materials and construction. .

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A Kamvalok Fitting For Any Installation

SwivelJoints carries a Kamvalok fitting that will work in just about any application you need. Fittings are available in a range of types, sizes and materials. They provide leak-proof connections at pressures up to 10,000 psi due to being engineered with large flow chambers, and manufactured to the highest industry standards.

Kamvalok fitting

A Kamvalok fitting is interchangeable with popular makes of automatic, semi-automatic and lock-ring type couplings. These fittings are used to connect air and fluid lines in a variety of industries.

Because of its unique poppet action the OPW Kamvalok® Dry Disconnect virtually eliminates spillage of any residual liquid contained within the line after disconnection. A Kamvalok fitting is frequently used at transfer points where product loss is unacceptable.

Common applications of this fitting include inks, paint, adhesives, lacquers, fatty acids, liquid soaps, pharmaceuticals, petroleum products, ag-chemicals, solvents, detergents, vegetable oils, diesel exhaust fluid (DEF) and many acids and caustics.

In addition, vapor fittings provide easy access to recover vapors for either top or bottom loading and unloading tank truck operations.

Kamvalok also makes adaptors specifically designed to mate with OPW Kamvalok® couplings to help prevent liquid spillage during the connection/ disconnection process.

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A Spring Loaded Coupler

Kamvalok couplingThe Kamvalok coupling is built by OPW Engineering Systems and is a dry-disconnect coupling with a quick connect and disconnect feature.

This is a spring loaded coupler with a built-in valve. The internal adapter contains a poppet that is spring loaded and assures fast closing and a super tight seal ensuring no spillage of liquids. If the Kamvalok coupling were ever to be accidentally disconnected while product flow is in progress and the lever is in the open position, the poppet in the adapter will automatically close and the seal cylinder will immediately stop any flow through the coupler. The 360° orientation of the coupling further eliminates the need for swivels and simplifies connection.

By closing and opening two cam arms that lock into a machined groove around the circumference of the mating adapter connections and disconnections are achieved. After the Kamvalok adapter and coupler are firmly coupled together, the lever is turned to the open position, and product flows freely around the poppet discs.

The Kamvalok coupling can be specified with:

•    Aluminum externals and components.
•    Aluminum with stainless steel internal parts.
•    All stainless steel.
•    Seals available in buna-N, Viton, Teflon, EPT, EPDM, EPR, Kalrez, Chemraz, or other compounds.
•    Locking or non-locking handle.
•    3/4″ (20 mm), 1½” (38 mm), 2″ (50 mm), and 3″ (76 mm) sizes, depending upon style and material.

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Connecting with Dry Disconnect Couplers

dry disconnect couplersThe standard of the industry of disconnect couplers are the OPW Kamvalok® Dry Disconnect Couplers. OPW Kamvaloks® are used at liquid transfer points where product loss could occur. They provide a reliable solution to prevent spillage during connection or disconnection. Dry Lok couplers are the closest dry disconnect on the market. They feature low pressure drops, along with very tight seals, allowing virtually no spillage. Because of their unique poppet action they eliminate spillage of any residual liquid contained within the line after disconnection.

Where safety is a concern and where product loss is unacceptable Kamvaloks® Dry Disconnect Couplers are used at transfer points. The most common applications requiring the use of disconnect couplers include the manufacturing of paint, lacquers, inks, adhesives, fatty acids, pharmaceuticals, liquid soaps, and many other liquid products. They are particularly well suited for handling petroleum products, solvents, ag-chemicals, vegetable oils, detergents and many acids and caustics.

OPW Kamvaloks® provide automatic closure from both directions – the coupler and the adapter. With it’s simple connection and disconnection design and lever actuated internal poppet configuration, this has become the first choice for liquid transfer operations in all manufacturing environments.

The size of the dry disconnect couplers should be carefully selected and the temperature should be considered when selecting any coupling. The coupler must work at the required temperature and the correct pressure.

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Types of Couplers

couplersCouplers are necessary components of many different industries. They’re used to connect two shafts together for the transmission of power. Positive couplers can be used to transmit rotary power from one shaft to another, where both shafts turn. The use of couplers allows for some degree of misalignment or end movement.

There are different types of shaft couplers. Each of the various types has its own specific application.

Rigid couplers. For use when there are requirements for the precise shaft alignment. There are variations of this coupler such as the flange coupler and the muff coupler.

Torque limiting couplers. Will protect systems against conditions of over torque.

Flexible couplers. Useful in connecting a driving shaft or flange element to an adjacent in-line driven member. It flexes enough while rotating to accommodate, within limits, undesirable effects caused by axial misalignment, shaft end movement, and vibration between connected members. This kind of coupler can also be further divided into many other types (disc coupler, universal coupler, jaw coupler, bellows coupler, and gear coupler.

At Swivel Joints we stock a large assortment of Kamvalok couplings, a dry disconnect which helps eliminate dripping before, during, and after loading, as well as Dry Lok couplers, the closest dry disconnect on the market. It features low pressure drops, along with very tight seal, allowing virtually no spillage.

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Most Popular Kamvalok Fittings

Kamvalok fittingsThe Kamvalok fittings we stock are one of the most popular cam-and-groove couplers in the industry. These fittings have an exclusive twin-kam arm design that features a unique detent position and a built-in valve with a spring-loaded poppet that automatically closes when disconnected for the prevention of accidental release and spills. You’ll reduce the hazards involved in the connection/disconnection process of transferring hazardous materials when you use reliable fittings such as these.

At SwivelJoints.com we offer you most excellent customer service and very fast delivery on any parts and supplies you order from us. If you are in need of Kamvalok fittings and need assistance when placing your order, you can call our toll-free customer service number at1-866-761-7225 and we promise you  all of your questions will be answered to your satisfaction. Make a responsible choice. Use these fittings to help implement environmental guidelines by keeping toxic or hazardous chemicals in line.

Unsure of the correct Kamvalok fittings you need for your application? Check out the large variety of fittings we have available on our web site. We have an online configuration tool to make selecting the correct fitting easy. The part number guide lists size, style, metal, and seal for each part we have enabling you to double check that you are ordering the right part. Contact us at any time if you require specifications or more information.

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Railroad Related Items

We have a full range of railroad related items besides our popular railcar loading arms.

railcar loading armsThe ‘Heads Up’ Railcar Motion Detector is a new safety siren designed to give rail yard workers a warning if a car starts to move. The ‘Heads Up’ attaches magnetically to the bearing cap of any freight car wheel. For the same reason that forklift truck and other vehicles are equipped with beepers, the ‘Heads Up’ detector warns workers that a rail car is moving. When the car wheel turn more than 10 degrees in either direction, the battery-powered sensor emits a powerful 90 db two-tone warble. The siren has a baffle to moderate the sound level, and an illuminated on-off switch. The NEMA-4X housing is rain and dust-proof and all hardware is corrosion-resistant. A 9-volt replaceable battery provides 30 minutes of siren life. The ‘Heads Up’ weighs 1 pound and fits in the palm of the hand.

railcar loading armsThe Railcar Motion Sensor operates on 110-vAC and can detect a railcar, truck, or any other large, metallic, moving object up to 100 feet away from the sensor unit. The sensor is adjustable to mass and velocity and can be installed up to 1,000 feet away from the light and horn control box. The sensing unit is designed to be buried under the railroad track or roadway. NEMA-4 controls are standard, and explosion proof units are available.

See our full line of railroad related items on our website including our railcar loading arms.

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Ordering Swivel Joints

OPW swivel jointsIf you’re looking for OPW swivel joints for your application you’ll love our online configuration tool at SwivelJoints.com. It makes finding the right OPW swivel joints for your application easy. If you have a part number it’s even easier. There is a part number guide that gives metal, style, size, and seal for each part so you can double check what you’re ordering.

For applications where a hose is necessary, these joints mounted at the end of the hose eliminates kinking and twisting and reduce hose wear. Plus when they are fitted to metal frameworks and attached to hoses, the hose can be guided and kept from kinking and denting or scratching tanks, trucks, and other equipment.

In the fields of petroleum, chemical, refining, mining, distilling, brewing, and more there are hundreds of applications requiring OPW swivel joints. These piping components rotate 360 degrees and permit the use of rigid metal piping for loading and unloading hazardous chemicals, petroleum, and other materials without the danger of handling cumbersome hoses.

Our OPW swivel joints feature combinations of five metals and five seal materials to meet most material handling requirements. They can also be custom designed to conform to unique specifications.

We guarantee you’ll like our competitive prices, fast delivery and the outstanding customer service that we offer our customers each and every time.

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