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Caliper Brakes

Product catalog summary

Overview: The document provides technical specifications for WPT Power caliper disc brakes, specifically models WDA-26 and WDA-28. These calipers are designed for harsh environments and are suitable for applications such as drawworks, well servicing rigs, and forestry operations.

Specifications:

Model WDA-26: Available rotor sizes are 30 in (762 mm), 40 in (1016 mm), and 48 in (1219 mm). Torque ranges from 15,300 lbf·ft (20800 N·m) to 26,900 lbf·ft (36400 N·m). Maximum speed varies from 720 to 1150 r/min. Effective radius ranges from 0.96 ft (0.29 m) to 1.69 ft (0.51 m). Maximum pressure is 100 lbf/in2 (7 bar) with a volume per actuation max of 110 in3 (1820 cm3). Clamping force totals 31,800 lbf (141500 N) with a lining area of 200 in2 (1290 cm2) and maximum lining wear of 0.35 in (9 mm).
Model WDA-28: Rotor sizes include 48 1/2 in (1232 mm), 54 1/2 in (1384 mm), and 60 1/2 in (1537 mm). Torque ranges from 38,100 lbf·ft (51600 N·m) to 49,700 lbf·ft (67400 N·m). Maximum speed ranges from 570 to 710 r/min. Effective radius ranges from 1.59 ft (0.48 m) to 2.07 ft (0.63 m). Maximum pressure is 100 lbf/in2 (7 bar) with a volume per actuation max of 180 in3 (2950 cm3). Clamping force totals 48,000 lbf (213600 N) with a lining area of 415 in2 (2677 cm2) and maximum lining wear of 0.38 in (10 mm).

Design and Materials: The calipers are constructed from die-cast silicone bronze with stainless steel hardware. They feature lever operation and adjustable clevises for regulating disc and shoe clearance. The actuators require minimal air or hydraulic pressure. The design includes non-asbestos friction material, with semi-metallic pads available for higher torque applications. Balancing links ensure even lining wear.

Dimensions:

WDA-26: Caliper dimensions include A: 6 1/4 in (159 mm), B: 7 1/2 in (191 mm), C: 4.750 in (120.65 mm), D: 7.500 in (190.50 mm), E: 10 15/16 in (278 mm), F: 20 1/2 in (521 mm), G: 9 1/2 in (242 mm), H: 18 1/2 in (470 mm). Rotor dimensions vary with size.
WDA-28: Caliper dimensions include A: 6 13/16 in (173 mm), B: 8 5/8 in (219 mm), C: 5.203 in (132.16 mm), D: 7.000 in (177.80 mm), E: 12 3/8 in (318 mm), F: 25 3/4 in (654 mm), G: 12 3/4 in (324 mm), H: 24 1/2 in (622 mm). Rotor dimensions vary with size.

Additional Information: WPT Power reserves the right to make changes to product information without prior notice. For more details, contact an authorized distributor or visit WPTpower.com.

Catalog excerpts

Caliper Disc Brake WPT Power calipers are engineered to perform in unforgiving environments where real world conditions can severely affect performance and reliability. Our wide range of caliper disc products are a great fit for drawworks on both land and off-shore operations, well servicing rigs, and forestry applications. Our rugged, low-maintenance calipers are made of die cast silicone bronze with high quality stainless steel hardware. These calipers are lever operated and have adjustable clevises on the actuators to regulate the disc and shoe clearance. The actuators are designed to use...

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Rotor Dimesions

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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