The spring applied hydraulic released brake heads needs 60Bar for hold off pressure. The powerpack charges an accumulator and as soon as the set pressure is reached it is switched off. As the brake system is operated, it consumes oil which will causes the powerpack to start up and recharge the accumulator.
The emergency brake valve is normally closed. It is a 2 position 3 way valve with the brake head side of the valve open to tank and the supply shut off. In the energized condition the supply is open to the brake heads and will allow the brakes to be released. Any los of electrical power or manual operation will cause the brakes to be applied. This valve can be wired to a number of devices to have the brakes applied. Dead mans switch, open door, low engine oil press etc.
The reverse modulating valve is fitted in series with the emergency brake valve. The valve is piloted by the existing service brake system. If the operator applies the service brake, the pressure inside the failsafe brake heads is drained out proportionally depending on the degree of pressure applied by the operator on the service brake. The emergency brakes will therefore be applied with the operation of the service brake. Any hydraulic pressure or hose failure will result in the failsafe brakes to be applied.
- Two failsafe brake heads fitted on to the rear axle
- Hydraulic power pack, 12VDC
- Reverse modulating valve
- Emergency brake solenoid valve
[wds id=”4″]