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A blowdown valve (BDV) is a type of shutdown valve designed to depressurize a pressure vessel by directing vapour to a flare, vent or blowdown stack in an emergency. BDVs fail-safe to the open position upon failure of the control system. [1] The type of valve, type of actuation and performance measurement are similar to an ESD valve.
An emergency switch in Japan. On railways, [1] an emergency stop is a full application of the brakes in order to bring a train to a stop as quickly as possible. [2] This occurs either by a manual emergency stop activation, such as a button being pushed on the train to start the emergency stop, or on some trains automatically, when the train has passed a red signal or the driver has failed to ...
To the right of the Sifa pedal is the foot-operated button for the train horn Sifa is a type of deadman's control system used on German-influenced European railways. [ 1 ] Although deadman's pedals are commonly used on railways worldwide, Sifa systems are specifically those codified by German Industrial Norms VDE 0119-207-5.
The terms "active" and "passive" are simple but important terms in the world of automotive safety. "Active safety" is used to refer to technology assisting in the prevention of a crash and "passive safety" to components of the vehicle (primarily airbags, seatbelts and the physical structure of the vehicle) that help to protect occupants during a crash.
Later models would use electronic height sensors and motors so adjustment could be achieved with the engine off. This system allowed the suspension to achieve an unusually soft ride quality. [7] Since then, millions of fairly inexpensive Citroën cars have been equipped with self-levelling as an unobtrusive, but integral design feature.
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Old versions of the ride did not compensate for lateral movement considering the sweeps were attached directly to the top of the cars (Saturn 6). The Hurricane and Downdraft use a car mount pivoting saddle in which the cars are placed held upright by angular retention cables mounted to the top of the rotating hub mounted to the tower via avon ...
Partial stroke testing (or PST) is a technique used in a control system to allow the user to test a percentage of the possible failure modes of a shut down valve without the need to physically close the valve. PST is used to assist in determining that the safety function will operate on demand.