RECENT RESEARCH ON HYDRAULIC SEALS Available to Purchase

The need to confine fluid within a container without leakage is a problem to be found throughout the whole of the engineering industry. In many cases there is no difficulty in making suitable leak‐tight joints, even between moving parts of machinery, but where factors such as vibration, high sliding speeds or uncertain clearances are involved, or where the liquid is at very high temperature or pressure, the operating conditions imposed on the seal may be very severe. Such conditions are now being met in the atomic energy, chemical and power generation industries, and progress is at times delayed solely due to sealing problems. In the branch of engineering concerned with lubrication of bearings the high temperatures imposed on equipment in turbines, aircraft and rockets have created new problems of sealing.