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Rexnord Industries, LLC
Falk™ Selection Guide, True Torque Fluid Couplings, Type HF

Falk™ Selection Guide, True Torque Fluid Couplings, Type HF

Product catalog summary

Overview: The document discusses Falk™ True Torque® Fluid Couplings, emphasizing their role in providing economical soft starts and shock-load protection for industrial applications like conveyors and crushers. These couplings enhance component lifespan by protecting systems from sudden starts and overloads.

Key Features:

Soft Start Flexibility: Offers cushioned starts and smooth acceleration economically.
Mechanical Overload Protection: Prevents system failure due to overloads.
High Capacity Options: New sizes 2760HF & 2870HF offer higher capacity at higher speeds.
Increased Starting Torque: Utilizes standard NEMA B motors for increased starting torque.
Reliability: Proven performance with minimal maintenance due to non-contacting surfaces.

Technical Specifications:

Durability: High Temperature Viton® Seals and Flexible Coupling.
Softer Starts: Extended Delay Fill Chamber for longer starting profiles.
Fluid Regulation: Adjustable Metering Orifices for larger sizes.

Applications: Recommended for conveyors with unloaded starts, low inertia, or concave sections. HFDD type is suggested for sophisticated belt conveyors to reduce shock and stretch at startup.

Protection Mechanisms:

Fusible Plugs: Standard feature to prevent damage during jams.
Proximity Sensor Cutout Switch: Optional accessory to prevent fluid discharge during frequent overloads.
Thermal Trip Plug: Optional accessory for additional protection.

System Integration: Rexnord offers complete drive systems with gear drives, couplings, and motors for ease of integration.

Mounting Arrangements:

Gear Coupling Mount (HF20): Economical with drop-in/drop-out servicing.
Disc Coupling Mount (HF25): Non-lubricated, suitable for high power and rpm.
Sheave/Hollow Shaft Mount (HF41): Designed for V-belt connections.

Safety and Compliance: Installation and operation must conform to local and national safety codes. Rexnord products are not approved for people conveying equipment.

Warranty: The fluid couplings come with a 1.5-year warranty from the date of shipment.

Benefits:

Soft Cushioned Starts: Gradual torque increase prevents damage from abrupt acceleration.
Increased Starting Torque: Utilizes motor's breakdown torque efficiently.
Overload Protection: Reduces stress on components during jams.
Reduced Current Draw: Minimizes electrical consumption and extends motor life.

Conclusion: Falk™ True Torque® Fluid Couplings offer a reliable and economical solution for protecting industrial systems from shock loads and overloads, ensuring smooth operation and extended component life.

Specifications:
1. Fastener Types: Two types of fastener retention for hollow shaft mounts: Type HF31 (Setscrew Retention) and Type HF32 (Keeper Plate Retention). Type HF31 is available in sizes 320-1480 and is secured with two setscrews. Type HF32 is available in sizes 320-2760 and requires a keeper plate and retention fastener.
2. Performance: Both types offer excellent performance at high power and high RPM.

Procedures:
1. Installation: Follow manufacturer’s recommendations for tensioning V-Belts. For Type HF32, drill and tap the driven shaft end for the retention fastener.
2. Fluid Coupling Operation: Based on hydrokinetic principles, requiring the output speed to be less than the input speed. Efficiency is determined by the slip percentage.

Norms and Standards:
1. Standard Features: Fluid couplings have a capacity of 1-1500 HP, efficiencies up to 99%, and include high-temperature Viton seals and fusible overload plugs for protection.
2. Overload Protection: Includes proximity sensor cutout switches and thermal trip plugs to prevent fluid discharge and protect against overheating.

Recommendations:
1. Soft Start Solutions: Delay fill (HFD) and extended delay fill (HFDD) options provide softer starts for belt conveyors, with metering orifices to control fluid flow.
2. Coupling Guards: Use Orange Peel coupling guards for cooling and containment of fluid discharge.

Key Data from Tables and Diagrams:
1. Delay Fill Chambers: Used to provide soft starts by controlling the fluid flow rate into the working circuit.
2. Accessories: Lists accessories like proximity sensor cutout switches and thermal trip plugs for overload protection.

Critical Information:
1. Selection Procedure: Select fluid couplings based on running load horsepower and torque requirements. Consider the start factor, which is the ratio of starting torque to running load torque.
2. Applications: Suitable for applications requiring soft starts, overload protection, and load balancing.

Fluid Coupling Selection Guide Summary

Specifications:
Guidelines for selecting fluid couplings for various applications, emphasizing the importance of the initial start factor, which ensures a soft start for low inertia conveyors and is crucial for overcoming breakaway torque.

Procedures:
1. Determine the application type and refer to the appropriate pages for start factor selection.
2. Use the Quick Selection Tables to choose the correct fluid coupling type based on the application and required start factor.
3. Select a mounting arrangement from the options provided.
4. Check the Availability Table to ensure the selected coupling type and mounting arrangement are available and meet the allowable speed requirements.
5. Verify the bore capacity of the selected coupling using the dimension tables.

Norms and Recommendations:
Recommends using specific start factors for different applications: 120%-140% for belt conveyors, 140% for fans, 170%-200% for mixers, and 250% for crushers. Suggests considering alternative types or arrangements if the initial selection is unavailable or insufficient.

Selection Example:
An example is provided for selecting a fluid coupling for a belt conveyor with a motor rated at 100 HP and 1775 rpm. The process involves selecting the start factor, coupling type, and mounting arrangement, and verifying availability and bore capacity.

Tables and Data:
Includes several tables, such as the Start Factor Table, Quick Selection Tables, and Availability Table, providing detailed information on coupling sizes, types, mounting arrangements, and allowable speeds for different applications and load horsepower.

Critical Information:
Key parameters include the start factor, percent slip, fill angle, and allowable speed. Highlights the importance of selecting the correct coupling type and arrangement to ensure efficient and reliable operation.

Catalog excerpts

Falk™ Selection Guide, True Torque Fluid Couplings, Type HF -1

Falk > True Torque > ٮ Fluid Couplings Protecting Your System andEnhancing Component Life > (English-Inch) size="-1">

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Falk™ Selection Guide, True Torque Fluid Couplings, Type HF -2

Ε Unmatched, cushioned soft startflexibility, at an economical price point. Smooth acceleration. Mechanical overload protection. Օ NEW sizes 2760HF & 2870HFoffer higher capacity at higher speeds. Increased starting torqueavailable from standard NEMA B motors with a fluid coupling. This is a benefit not offered by electronic soft start solutions. Օ Proven reliability in demanding applications. No contacting surfaces to wearout Յ virtually no maintenance.Providing the softest, smootheststart will maximize the life of your system components.As the smart alternative toexpensive & complicated electronic...

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Falk™ Selection Guide, True Torque Fluid Couplings, Type HF -3

NEW Longer starting profilesand softer startsՕ For Sizes 1420HF & larger,adjustablemetering orificesregulate the passage of fluid from the delay fill chamber into the working circuit, further softening the start. For sophisticated belt conveyors,consider Type HFDD. The extended delay fill chamber permits initial start factor as low as 40% of the full load torque, dramatically reducing shock & stretch to the belt at startup.Use of the extended delay fillchamber(HFDD) is recommendedfor conveyors subjected to unloaded starts, those with concave sections, those with low inertia, or those with any...

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Falk™ Selection Guide, True Torque Fluid Couplings, Type HF -7

MOTORCURRENT&TORQUE% MOTORCURRENT&TORQUE% MOTORCURR ENT&TORQUE%

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Falk™ Selection Guide, True Torque Fluid Couplings, Type HF -8

Type HF20 (Exposed Bolt) > ● Most Economical > ● Drop-in/drop-out servicing (no need to move connectedequipment) > ● Available Sizes 185-1660 > ● Readily shipped from stock components Pages 22-23 Page 26 Pages 28-31 Page 27 > Type HF31 (Setscrew Retention)Type HF32 (Keeper Plate Retention) > ● For limited shaft gaps/Steelflex grid coupling at driving end > ● Hollow shaft bored to the order > ● Type HF31/available Sizes 320-1480/secured to driven shaft with (2) setscrews/allow clearance for setscrew wrench > ● Type HF32/available Sizes 320-2760/secured to driven shaft with keeper plate & retention...

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Falk™ Selection Guide, True Torque Fluid Couplings, Type HF -11

FLUID FLOWABOVE BAFFLES DRIVER1775RPMDRIVEN1750RPM > FLUID FLOW DROPSCONTACTINGBAFFLES ANDREDUCING TORQUE DRIVER1775RPMDRIVEN0RPM > AT RESTAT RESTRUNNING DELAY FILLCHAMBEREXTENDEDDELAY FILLCHAMBEREXTENDEDDELAY FILLCHAMBER > METERING ORIFICES DETERMINE FLOW RATEFROM FILL CHAMBER TO WORKING CIRCUITEXTERNALACCESS PLUG (3) EQUALLY SPACED REPLACEABLEMETERING ORIFICE(3) EQUALLY SPACED Rexnord Industries, LLC, 1982, 2008.(521-110) 11 >

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Falk™ Selection Guide, True Torque Fluid Couplings, Type HF -13

Each fluid coupling is shipped with an angle finder. Reorder incase of loss or damage. The angle finder will ease the task of filling the fluid coupling to the specified fill angle. Setup time is reduced, because the angle finder is direct-reading. Simply place the angle finder on the filler plug boss and rotate the coupling to the required fill angle. > Fluid coupling/disc brake packages are versatile designs that can be customized to meet your specific needs. The superior performance inherent in disc brakes, combined with the benefits of a fluid coupling, provide an ideal package for inclined...

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Falk™ Selection Guide, True Torque Fluid Couplings, Type HF -14

The fluid coupling is a multiple use device: > ● Provide soft cushioned starts > ● Provide increased starting torque > ● Provide overload protection Availability Table , Page 15. Table indicateswhether the selection is available, and if so, the allowablespeed.6.If initial basic type and mounting arrangement not available,or insufficient allowable speed, consider alternative basictype/mounting arrangement.7.Check bore capacity of the coupling selected, dimensiontables, Pages 22 thru 31. > ● Reduce current draw when starting > ● Provide load balancing for multiple drives > ● Provide load dampeningTo...

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Falk™ Selection Guide, True Torque Fluid Couplings, Type HF -17

LoadHorse-power LoadHorse-power 35.0 . . .. . .. . .. . .. . .. . .. . .. . .14203.2910.60 35.040.0 . . .. . .. . .. . .. . .. . .. . .. . .14203.5890.55 40.045.0 . . .. . .. . .. . .. . .. . .. . .. . .14203.8860.54 45.050.0 . . .. . .. . .. . .. . .. . .. . .. . .14204.1840.54 50.055.0 . . .. . .. . .. . .. . .. . .. . .. . .14204.8820.53 55.060.0 . . .. . .. . .. . .. . .. . .. . .. . .14205.0800.52 60.067.5 . . .. . .. . .. . .14203.1910.5514803.2920.58 67.575.0 . . .. . .. . .. . .14203.3900.5214803.4890.56 75.087.5 . . .. . .. . .. . .14203.7860.5314803.8850.59 87.5100.0 . . .. . .. . .....

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