viperstone
New member
When braking, you have release, then Initial, then application. The term handle off means ???????....Emergency? Thanks in advance
Handle off on braking?
- Thread starter viperstone
- Start date
The Handle off position on say a "26L" system auto brake valve would reduce the brake pipe pressure to approx 50 KPA (from fully charged) at a service rate of reduction (not an emergency rate). This position is used litterally to take the brake handle off the brake valve when stabling the locomotive or when transfering control stations on dual control stand fitted units. Hope this helps regards SSPUR2
Puffingbilly
Member
It literally means the position that (In real life) allows the driver to remove the brake handle from the brake pedestal. That is, on certain brake systems.
As for emergency, this should again be self explanatory. It's the position you put the brake handle in for an emergency brake application (basically like opening a hole in the brake pipe, it exhausts the air out to apply the brakes to a maximum application rapidly).
Zec
As for emergency, this should again be self explanatory. It's the position you put the brake handle in for an emergency brake application (basically like opening a hole in the brake pipe, it exhausts the air out to apply the brakes to a maximum application rapidly).
Zec
The Handle Off position is provided to make the normal functions of the brake valve inoperative whilst the brakes are being controlled from a brake valve in another cab (either from another loco in multiple unit operation or from another cab in the same loco). The spool valves take up the same positions as they do in the Suppression position. The equalizing reservoir regulating valve adjustable spring tension is released so venting the equalizing reservoir to zero. This action would cause the relay valve to vent the brake pipe if no other action is taken.
Normally when in Handle Off the brake pipe is blocked off from the relay valve by the brake pipe cut off valve which is held closed by main reservoir air from the brake valve cut off valve when it is turned to Cut Out when cutting out a cab.
The position may be used on a lead loco to make a brake pipe reduction much greater than Full Service. With the brake valve cut out valve set to In moving the handle to Handle Off will reduce brake pipe pressure to about 10 lbs at a service rate.
Clear now? :hehe:
Cheers
Nix
Normally when in Handle Off the brake pipe is blocked off from the relay valve by the brake pipe cut off valve which is held closed by main reservoir air from the brake valve cut off valve when it is turned to Cut Out when cutting out a cab.
The position may be used on a lead loco to make a brake pipe reduction much greater than Full Service. With the brake valve cut out valve set to In moving the handle to Handle Off will reduce brake pipe pressure to about 10 lbs at a service rate.
Clear now? :hehe:
Cheers
Nix