Chicago MVA highway response, 1-23-16

Here are a few photos of what was initially reported as a pinned vehicle at EB JFK on Natoma. When I arrived, no one was actually trapped. At least one person was taken to a trauma center. It looked pretty serious… I hope the injuries were not too bad. There's a good view of the blocking technique used by the responders.

Steve Redick photo

Steve Redick photo

Steve Redick photo

Steve Redick photo

Steve Redick photo

It’s always sobering to see emergency crews in action, especially when it’s a high-traffic area like this. The way they set up their scene and work together really shows how well-trained they are. These images give a real sense of the situation on the ground—fire trucks, paramedics, and the calm but focused atmosphere that comes with a major incident. Thanks, Steve, for sharing these shots. They're a valuable look into the response effort.

Exhaust Valve

The role of the intake valve is to draw air into the engine and mix it with the fuel to burn; The function of the exhaust valve is to discharge the exhaust gas after combustion and dissipate heat.

The valve is composed of a valve head and a rod. The valve head temperature is very high (intake valve 570~670K, exhaust valve 1050~1200K), but also withstand the pressure of the gas, the valve spring force and the transmission component inertia force, its lubrication, cooling conditions are poor, requiring the valve must have a certain strength, stiffness, heat and wear resistance.

The intake valve is generally made of alloy steel (chromium steel, nickel-chromium steel), and the exhaust valve is made of heat-resistant alloy (silicon chromium steel).

Sometimes in order to save heat resistant alloy, the exhaust valve head is made of heat resistant alloy, and the rod is made of chromium steel, and then the two are welded together.

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