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The Art of Railroading: Modern air-brake practice.
The Art of Railroading Modern airbrake practice Author:Unknown Author Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: after the same manner in which air is passed into the pump cylinder. The Westinghouse Automatic oil cup consists of a brass body, in the main chamber of which... more » the oil is contained, and extending through this chamber there is a regulating valve, the end of which is pointed so that if it is desired to increase or decrease the flow of oil the pin-valve can be moved up or down by means of a regulating nut, and kept in position by a small lock nut. In the body of the valve below the pin-valve there is a ball valve, and the operation of this automatic oil cup is as follows: As there is a small port in the cap nut, atmospheric pressure is always admitted to the top of the oil in the main oil chamber, consequently when the pump piston is moved down the partial vacuum in the pump cylinder causes the ball valve to be lifted off its seat so that the oil, which has previously passed from the main oil chamber around the point of the regulating valve into the passage controlled by the ball valve, is drawn into the pump in the form of a fine spray. When the piston makes its up stroke the compressed air holds the ball valve to its seat, thereby preventing the oil from being blown out of the oil cup chamber. This refers to the No. i oil cup. The No. 2 Westinghouse oil cup consists merely of a brass body having a chamber in which the oil is contained and, instead of having a ball alve and a regulating valve there is a small check valve to which is attached a needle-rod of very small diameter, and which extends up through a small opening in the bottom of the oil chamber. On the under side of the check valve there is a spring, so that the operation of the No. 2 automatic oil cup is as follows: As the pump piston makes a down stroke the partial vacuum in the pump cylinder causes the check valve ...« less