Does anyone have any documentation relating to this trailer brake application lever. We have a trailer that can work in either direction by swapping the drawbar and the steerer's platform end to end, so there is one of the valves at each end of the trailer for the rear end steers person to apply the trailer brakes. In operation it is very similar to the railway "Engineer's brake AND EQUALIZING-DISCHARGE VALVE." and "triple valve" combination.
In this position the brakes are off and this is the normal running position.
There is a detent notch to leave the lever in this position.
Moving the lever to dead centre "laps" the valves and the brakes remain of, but variations in brake pipe pressure can lead to the brakes being gradually applied. there is another detend notch for this condition.
As the lever is moived further to the right the brakes are gradually applied. If the valve is returned to the straight ahead position the braking pressure is maintained. Emergency braking is achieved by taking the lever fully to the right.
To release the brakes the must be turned to the left of the normal running position notch. the further round the lever is taken the more the braking is reduced. The brakes are only fully released when the lever is taken fully to the left.
When the brakes are fully off the lever is returned to the running position detent notch.
Has anyone any info regarding this system, as applied to a road going trailer, rather than using a similar system on Railway carraiges? (which is fairly well documented http://www.catskillarchive.com/rrextra/chapt21.Html ).
Has anyone any information as to the design specification of the "triple valve" or "Relay emergency valve" that is used in this situation?
Question
antarmikeDoes anyone have any documentation relating to this trailer brake application lever. We have a trailer that can work in either direction by swapping the drawbar and the steerer's platform end to end, so there is one of the valves at each end of the trailer for the rear end steers person to apply the trailer brakes. In operation it is very similar to the railway "Engineer's brake AND EQUALIZING-DISCHARGE VALVE." and "triple valve" combination.
In this position the brakes are off and this is the normal running position.
There is a detent notch to leave the lever in this position.
Moving the lever to dead centre "laps" the valves and the brakes remain of, but variations in brake pipe pressure can lead to the brakes being gradually applied. there is another detend notch for this condition.
As the lever is moived further to the right the brakes are gradually applied. If the valve is returned to the straight ahead position the braking pressure is maintained. Emergency braking is achieved by taking the lever fully to the right.
To release the brakes the must be turned to the left of the normal running position notch. the further round the lever is taken the more the braking is reduced. The brakes are only fully released when the lever is taken fully to the left.
When the brakes are fully off the lever is returned to the running position detent notch.
Has anyone any info regarding this system, as applied to a road going trailer, rather than using a similar system on Railway carraiges? (which is fairly well documented http://www.catskillarchive.com/rrextra/chapt21.Html ).
Has anyone any information as to the design specification of the "triple valve" or "Relay emergency valve" that is used in this situation?
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