| 摘要 |
An exhaust brake arrangement is provided for selective operation to facilitate braking of a vehicle such as an over-the-highway truck. The exhaust brake operates by selectively generating back pressure to the exhaust flow system, and thus drag on the engine and braking action. The exhaust brake arrangement includes pressure relief valve assembly which regulates the amount of exhaust back pressure build up to release same before design limits are exceeded. In addition the arrangement may include a bypass valve construction for selective positioning of the pressure relief valve assembly on line or off line, as may be desired.
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