2.1 Electrohydraulic drum brakes
Electrohydraulic drum brake types NAT, NDT y NFT are spring applied failsafe brakes that act on a drum. The brake is released by means of an electrohydraulic device called TURBEL. The TURBEL is a three-phase AC electrohydraulic thrustor. The TURBEL can be placed both vertically (conventional models) as well as horizontally (NDT-A models).
The braking torque can be adjusted and the brake offers an optional torque scale. NDT-V models incorporate the torque scale as a standard.
Antec offers two possible locations for the torque scale: vertical (traditional) position, for the NDT-V models, and the exclusive ECP system of Antec, which allows the torque scale to be placed horizontally, which offers simplicity and money save.
All the brakes offer stainless steel shafts, the brake joints have self-lubricating bushes and the brake shoes carry asbestos free linings.
The brakes are designed according to the following norms:
- NAT: AISE Nº11
- NDT/NDT-V: DIN 15.435
- NFT: S-472A
Antec electrohydraulic drum brakes can be equipped with any of the following options:
- Automatic lining wear adjustment (RA)
- Open brake switch indicator (CSA)
- Lining wear detector (DD)
- Hand release lever (DM)
- Progressive braking through a Descent valve in the thrustor (VD)
- Reduced torque (PR)
- Torque scale (ECP). Standard in NDT-V series
- Special Painting (PE)
- Pneumatic or hydraulic release (ANH)
- ATEX Certificate (ATEX)
NAT brakes according to AISE nº11 norm
Ø of the drum from 8″ to 30″
Torques between 270 and 11.400 Nm
NDT brakes according to DIN 15.435
NDT horizontal spring: Ø of the drum from 200 mm to 800 mm, with torques between 140 and 10.500 Nm
NDT-V vertical spring: Ø of the drum from 200 mm to 800 mm, with torques between 250 and 11.150 Nm
NFT brakes according to S-472A
Ø of the drum from 150 to 750 mm
Torques between 130 and 10.950 Nm