Corrosion-Resistant Couplings Suitable For Multiple Applications

A full line of shaft collars and couplings for pump drive and structural systems in water treatment, pollution control, and similar facilities is available from Stafford Manufacturing Corp. of Wilmington, Massachusetts.

Stafford Corrosion-Resistant Collars and Couplings are offered in 303 and 316 stainless steel, brass, bronze, and other materials for various power transmission and structural system requirements. Featuring a wide range of sizes and styles, they are suitable for use in pump drive systems, mixing equipment, flow control instruments, and other applications exposed to water, harsh chemicals, solvents, and detergents.

Developed for water treatment, pollution control, pulp and paper, chemical plants and related facilities, Stafford Corrosion-Resistant Collars come in 1-pc, 2-pc and set-screw styles in sizes up to 16″ I.D. and the couplings in 1-pc, 2-pc, and 3-pc styles up to 6″ I.D. All can be modified with special bores, keyways, mounting holes, flats, hinges, threads, and more.

Safety Coupling Catalog

Zero-Max has published a 12-page Zero-Max catalog of Torq Tender overload safety couplings. These overload safety couplings disengage motor drives for overload protection. They protect motor and drive systems from jam ups and excessive loading.

System designers will find this new catalog helpful when examining overload protection options for a particular system design. Available in models that will disengage torques from 2 to 3,000 in. lbs., mechanically operated Torque Tenders often are the best design option because they are tamper proof and do not require costly and potentially risky calibration procedures. The torque value is controlled by the Torq Tender part number ordered and preset at the factory.

Torq Tender operation in most mechanical power transmission systems is simple. When the load exceeds the Torq Tender rating preset with precision tempered torque springs, the unit’s drive key pivots out of a slot, disengaging the Torq-Tender coupling. Once the overload is removed and the speed reduced, the Torq Tender resets itself automatically. This automatic resetting action engages the system’s drive shaft and puts the entire drive system back into motion at its original position.

Torq Tenders are available in many standard sizes. The smallest is the TT1X with a 2 to 60 in. lbs. torque rating. The largest is the TT4X with a 750 to 3000 in. lbs torque rating. Special Torque Tender designs are also detailed in the new catalog for handling various mountings, bore sizes and housings.

Inside the new brochure is complete selection and ordering information. Also, you can now size, select and see the right Torque Tender solution with Zero-Max Partstream, the configurable 3D CAD downloads.

Handbook for Mechanical Torque Limiters

As a part of a series of technical handbooks developed for the European manufacturing industry, R+W has released a new handbook for the design and application of safety and overload couplings.

Covering the very basics of what torque limiters are, the varieties available, and why they are used, all the way though complex theories and advanced sizing formulas used to determine optimum coupling selection, this handbook includes information for all levels of design engineers with a potential need for torque overload protection. This is the second of a two part series, with the first book handling the design and application of precision couplings and line shafts. Contact R+W America for more information.

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New: R+W Series SK2 Safety Coupling

Completely corrosion proof for outdoor and wash-down applications, the R+W SK2 can be a failsafe solution to overload problems.

Torque overload protection is often overlooked in machine design until something jams resulting in expensive damage and down time. The R+W Series SK2 safety coupling was developed specifically for this purpose. It uses a patented ball detent system that is absolutely backlash free and will disengage within 1 to 3 milliseconds when an overload is detected.

Four versions are available including a single position, multi-position, load holding, and free wheeling. These couplings are preset in the factory to a customer specified disengagement torque and can be adjusted in the field after installation.

These unique couplings are manufactured with a stainless steel bellows exhibiting very high torsional rigidity with zero backlash. The moment of inertia is also very low due to its low mass and low weight, making them ideal for servo driven systems.

The SK2 couplings are available for a torque range of 0.2 to 1800 Nm (1.8 to 15,930 in. lbs.). Both shaft hubs are custom bored for shaft sizes of 4 to 80 mm (0.25in to 3.125in.).

More details at http://www.rw-america.com/torque-limiters/index.html

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