. Air brake text for engineers and firemen; . IQ n % J5 1 ^ § 6; :« r ?> PLATE 48. I20 AUTOMATIC & STRAIGHT AIR PLATE 49. AUTOMATIC & STRAIGHT AIR EQUIPMENT. 121 be located in the cab, preferably at a point where it will be pre-vented from freezing in cold weather. The double check valve on the engine and tender is connectedas shown. The air must pass through this valve when eitherapplying or releasing the brakes with the straight air or auto-matic equipment. The two side openings of the double check valve (Plate 56)are the brake cylinder connections, joined by a cored passagewa
. Air brake text for engineers and firemen; . IQ n % J5 1 ^ § 6; :« r ?> PLATE 48. I20 AUTOMATIC & STRAIGHT AIR PLATE 49. AUTOMATIC & STRAIGHT AIR EQUIPMENT. 121 be located in the cab, preferably at a point where it will be pre-vented from freezing in cold weather. The double check valve on the engine and tender is connectedas shown. The air must pass through this valve when eitherapplying or releasing the brakes with the straight air or auto-matic equipment. The two side openings of the double check valve (Plate 56)are the brake cylinder connections, joined by a cored safety valve on the tender may be screwed into one of thecylinder connections of the double check valve, as indicated inthe cuts, or in the pipe between the double check valve and thecylinder. On the engine, one brake cylinder should be connectedto each of the double check valve cylinder connections, and thesafety valve in either driver brake cylinder pipe. Each safety valve should be adjusted to open at 53 should be in direct communication with brake cylinder pres-sure, whether the automatic or strai
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