Official Proceedings Volume 16-17 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ... point." The writer has witnessed a 550 degree test oil, passed through a cylinder in steam superheated to 1,000 degrees, and from the water of condensation recovered in its original condition. This test was in the laboratory, but it demonstrated that when protected by the steam the oil stood an excessive temperature, and that phenomena of flashing, does not, and cannot occur while the oil is in the steam. The function of a lubricant, is to keep the rubbing surfaces apart; the determining quality of a lubricant is its ability to satisfactorily perform that function. The essential quality required is that of distribution over the surfaces to be lubricated. The best service from a valve or cylinder oil requires that it enter the steam chest thoroughly atomized, each drop being divided into thousands of minute drops, or atoms, as it reaches the rubbing surfaces. This is accomplished by a combination process of emulsification, vaporization, and atomization, and it follows that a first class cylinder oil must possess the qualities to readily emulsify and atomize, with a sufficient degree of vaporization to spread itself over the surfaces with the steam. In other words, to lubricate the steam. Uniformity ot distribution is as important as uniformity and continuity of supply. These are principles that apply to valve and cylinder lubrication, irrespective of type, of valve or temperature of steam. The design of valve, and method of introducing the oil, are very important factors. It has been practically demonstrated that a flat or slide valve cannot be successfully used with very high temperature steam because of the heat warping the valve, presenting an uneven surface to the seat. Reference to this type of valve pertains to its use with saturated steam. With ...