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WPT® Low Inertia Spring-Set (LISS) Brakes are a spring-applied / air-release design well suited for fail-safe applications. The LI Spring Set can also be used as a parking brake since no pressure is required to engage the brake. With adjustable spring release pressures, the LI Spring-Set can provide a range of torques that will suit many applications. WPT®'s Low Inertia Spring-Set Brakes are available in 1, 2, or 3 plate configurations with sizes ranging 6 through 60 inches.
Unit of Measure

Specifications

Brands

 N/A WPT®

Static Torque Rating at 60 Pound Force per Square Inch (lbf/in²) (4.1 bar) Minimum Release Pressure

 N/A 21500 lbf·in2430 N·m

Static Torque Rating at 75 Pound Force per Square Inch (lbf/in²) (5.2 bar) Minimum Release Pressure

 N/A 26800 lbf·in3030 N·m

Static Torque Rating at 90 Pound Force per Square Inch (lbf/in²) (6.2 bar) Minimum Release Pressure

 N/A 32200 lbf·in3640 N·m

Note for Static Torque Rating at Minimum Release Pressure

 N/A Dynamic (slipping) Torque is 75% of the Static Torque.

Maximum Speed Hub and Center Plate (CP)

 N/A 2140 rpm

Maximum Slip Speed

 N/A 1080 rpm

Lining Area

 N/A 230 in²1500 cm²

Weight and Inertia

Total Weight

 N/A 330 lb150 kg

Hub and Center Plate (CP) Weight

 N/A 65 lb30 kg

Hub and Center Plate (CP) Inertia

 N/A 9.9 lb·ft²0.42 kg·m²

Dimensions

Minimum Bore Range1 N/A 2.13 in54.1 mm
Maximum Bore Range2 N/A 4.20 in106.7 mm

Dimension - A (Imperial Mounting)

 N/A 21.248 in539.70 mm

Dimension - A Tolerance (Imperial Mounting)

 N/A +0.000 mm-0.003 mm+0.00 in-0.08 in

Dimension (B) Hole Circle (Imperial Mounting)

 N/A 20.00 in508.0 mm

Dimension (B) Diameter (Imperial Mounting)

 N/A 21/32 in

Quantity (Imperial Mounting)

 N/A 12

Dimension - C (Imperial Mounting)

 N/A 16.253 in412.83 mm

Dimension - C Tolerance (Imperial Mounting)

 N/A +0.00 mm-0.08 mm+0.000 in-0.003 in

Dimension - A (Metric Mounting)

 N/A 540.00 mm

Dimension - A Tolerance (Metric Mounting)

 N/A +0.00/-0.08 mm

Hole Circle (B) (Metric Mounting)

 N/A 510.0 mm

Diameter (B) (Metric Mounting)

 N/A 18.0 mm

Quantity (Metric Mounting)

 N/A 12

Dimension - C (Metric Mounting - H7)

 N/A 412.75 mm

Dimension - D

 N/A 16-1/4 in414.0 mm

Dimension - E (Ventilated Center Plate)

 N/A 8.19 in208.03 mm

Dimension - E (Ductile Slotted Center Plate)

 N/A 8.25 in209.55 mm

Features

Features

 N/A
  • Available in hydraulic or pneumatic release
  • High cycle life
  • Predictable preventative maintenance
  • Solid, slotted, or ventilated center plate options
  • Available with Full Marine Corrosion Protection package
  • Compatible with the Power Performance LI upgrade
  • Type approval certification available: DNV, ABS, ATEX

Note

Note

 N/A Consult WPT® Application Engineering for application assistance, service factors, specifications, and detailed drawings/3D models.
  • 1 Contact WPT® for larger bore sizes. Listed bore sizes are for square key.
  • 2 Contact WPT® for larger bore sizes. Listed bore sizes are for square key.