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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 4130 lbf·in467 N·m

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

 N/A 5170 lbf·in584 N·m

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

 N/A 6200 lbf·in701 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 4290 rpm

Maximum Slip Speed

 N/A 1890 rpm

Lining Area

 N/A 55 in²360 cm²

Weight and Inertia

Total Weight

 N/A 70 lb32 kg

Hub and Center Plate (CP) Weight

 N/A 9.3 lb4.2 kg

Hub and Center Plate (CP) Inertia

 N/A 0.46 lb·ft²0.019 kg·m²

Dimensions

Minimum Bore Range1 N/A 0.94 in23.9 mm
Maximum Bore Range2 N/A 2.50 in63.5 mm

Dimension - A (Imperial Mounting)

 N/A 12.125 in307.98 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 11.13 in282.6 mm

Dimension (B) Diameter (Imperial Mounting)

 N/A 17/32 in

Quantity (Imperial Mounting)

 N/A 6

Dimension - C (Imperial Mounting)

 N/A 8.378 in212.80 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 310.00 mm

Dimension - A Tolerance (Metric Mounting)

 N/A +0.00/-0.08 mm

Hole Circle (B) (Metric Mounting)

 N/A 280.0 mm

Diameter (B) (Metric Mounting)

 N/A 14.0 mm

Quantity (Metric Mounting)

 N/A 6

Dimension - C (Metric Mounting - H7)

 N/A 220.00 mm

Dimension - D

 N/A 9-3/8 in238.1 mm

Dimension - E (Ventilated Center Plate)

 N/A 5.94 in150.88 mm

Dimension - E (Ductile Slotted Center Plate)

 N/A 5.50 in139.70 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.