This is from Drew Gresik:

Here are some photos from an early morning fire at a vacant two-and-a-half-story house located at 728 N Lotus Ave in Chicago’s Austin neighborhood. The fire had fully involved the roof of the structure. A total of four lines were stretched, with E96 using their deck gun and TL23 deploying an aerial master stream.

The photography was challenging due to a mix of sleet and dense vegetation on the property. I included both natural light shots and flash photos to show how a camera flash performs in rainy or snowy conditions.

It's interesting to note that this incident occurred while several units, including TL14, were still tied up at a 2-11 at 1644 N Spaulding Ave. That location was also a significant call, so it shows how quickly things can change in the field.

A full gallery with more images will be posted on our website this Friday. If you're interested in seeing more, make sure to check back soon.

Chi-Town Fire Photos

Chi-Town Fire Photos

Chi-Town Fire Photos

Chi-Town Fire Photos

Chi-Town Fire Photos

Intake 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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