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Twiflex brakes offer safety & stopping power for mine applications


Twiflex has launched a larger, enhanced version of its highly successful     VMS2-SP safety brake, aimed specifically at the demanding Mine Hoist market. In common with the VMS-2, the VMS-3 is a spring applied, hydraulic released safety brake, but offers faster operation and superior performance, delivering a maximum static braking force of 300kN*, and 230kN** of dynamic braking force,  with the added benefit of infinite fatigue life.

The mine-ready, robust design of the VMS-3 is characterised by a strengthened, longer housing which integrates additional springs for improved braking force. Totally sealed to give excellent, corrosion and dust protection, the new design offers users the set-up and maintenance advantages of tamper proof pad/air-gap adjustment, the facility for external pad retraction, on-site torque adjustment and a “Park-Off” facility for achieving fast seal changes without the requirement for special tools.

The VMS-3 design also integrates small size pistons for quicker reaction times, coupled with an improved drainage system and a reduced retraction pressure of between 120 - 160bar (depending on rating). In addition, the status of the VMS-3 braking system can be linked to a PLC, providing warnings for such factors as low pad pressure and alarms for high oil temperature, low oil level and clogging of pressure filters.

Also optimising the operation of the VMS-3 safety brakes is Twiflex’s "MP" (Modular Range) of Electro Hydraulic Power Units. These provide an advanced and flexible means of brake control in the most arduous of operating conditions; typically, mining steelmaking and container handling. The "MP" unit is essentially an assembly consisting of a base unit, a hydraulic circuit and various auxiliary options. There is a selection from three common base units; the selection is determined by the brake to be controlled and the circuit opted for. There are four standard control circuits ranging from a basic on/off control to full closed loop utilising a PLC.             

The base units can be tailored with various auxiliary options to ensure all specifications are met. The modular system is particularly useful when the installation requires the operation and control of two or more independent brake circuits, or there is a special requirement for meeting a particular industrial specification.

*Static Braking: 300kN (with 1mm air gap).
**Dynamic Braking: 230kN (with 3mm air gap).

Twiflex Ltd: An Altra Industrial Motion Company.
Twiflex Ltd is part of Altra Industrial Motion Inc*. A Nasdaq-quoted company, Altra Industrial Motion Inc. is a leading multi-national designer, producer and marketer of a wide range of mechanical power transmission products. The company comprises nineteen primary businesses, some with multiple locations worldwide. It brings together strong brands covering over forty product lines with production facilities in nine countries and sales coverage in over seventy more.

About Altra Industrial Motion Inc.
Altra Industrial Motion, Inc, is a leading multinational designer, producer and marketer of a wide range of mechanical power transmission products. The company brings together strong brands covering over 40 product lines with production facilities in nine countries and sales coverage in over 70 countries. Altra’s leading brands include Warner Electric, Matrix International Wichita Clutch, Stieber Clutch, Twiflex Limited, Bibby Transmissions, Huco Dynatork, TB Wood's, Formsprag Clutch, Ameridrives Couplings, Industrial Clutch, Boston Gear, Marland Clutch, Nuttall Gear, Inertia Dynamics, Warner Linear and Kilian Manufacturing.
*Altra Holdings, Inc. (Nasdaq:AIMC), a leading global supplier of clutch brakes, couplings, gearing, belted drives, linear actuators and power transmission components,
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For further information contact:  Jon Cooksley, Sales & Marketing Director
Altra Industrial Motion Heavy Duty Clutches and Brakes Group – Europe
Twiflex Ltd, 104, The Green Twickenham, Middlesex. TW2 5AQ. Tel: +44 (0)20 8894 1161 E-mail:

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