Selvregulerende Bremser

This page is a translated version of the page Lapping and the translation is 8% complete.

Outdated translations are marked like this.

Afhængigt af det motoriserede køretøj er der to måder at kontrollere bremserørtrykket på: Selvregulerende og den ældre, ikke-selvregulerende.

Self-Lapping

På de selvregulerende systemer håndteres bremserørtrykket automatisk. Føreren kan indstille togbremsehåndtaget til enhver position inden for en rækkevidde. Jo længere den er indstillet i "anvend"-retningen, jo stærkere er bremsekraften og omvendt. Ventilen håndterer automatisk tømning eller tryksætning af bremserøret afhængigt af håndtagets position.

Non-Self-Lapping

The non-self-lapping control valves are older. With them, the control lever manipulates the brake pipe pressure directly, and the process is more hands-on. The lever has a few fixed positions. Two of the positions, called “release” and “service” can be thought of as adding and releasing the brake pipe pressure, respectively. The position in-between them, called “lap”, is used to maintain whatever pressure is in the brake pipe. The furthest position, called “emergency”, releases pressure at the fastest possible rate.

By controlling the brake pipe pressure, you indirectly control the cylinder pressure, and thus, brake application.

Auxiliary reservoirs are partially drained whenever brakes are applied. When brakes are then released, it takes some time for the reservoirs to be recharged. The lap position, however, functions only if the auxiliary reservoirs are full. So, to stay in full control over non-self-lapping brakes it is recommended to not release when knowing that moments later braking may be needed again. Calculated, infrequent moves are advised instead.

Monitoring

With both control valve types it is crucial to monitor the brake pipe and cylinder gauges to fully understand the current brake state.

Conflicts

In case a train contains multiple motorized vehicles their control valves are in conflict. The conflict can be even more severe if there are mixed self-lapping and non-self-lapping valves in the train. To ensure safe operation it is necessary to cutout all excess control valves, other than the one intended to be used.