GB191030019A - Improvements in or relating to Forced-lubrication Apparatus. - Google Patents

Abstract

30,019. Rainforth, W. F., and Napier & Son, D. Dec. 24. Delivery pipes; relief devices; indicators.-In a force-feed lubricating-system for internal-combustion engines &c., a loaded valve is placed in the delivery pipe of the pump to open an emergency branch to the main pipe, in order to supply an additional quantity of lubricant when the pressure rises to a predetermined extent above the normal, as at starting, or when the speed is exceptionally high. Oil from the pump passes by a pipe E, Fig. 1, to a piston valve A and normally raises it against a spring C, the position of the valve being indicated by a stem A<1> projecting through the cap B<1>. When the pressure is excessive, the valve A raises a movable abutment D held down by a stronger spring C<1>, and the oil escapes through an opening A<3> to a pipe F communicating with the cylinders or other parts to be lubricated. A separate relief valve may be employed to return oil to the reservoirs if the pressure is increased still further. Fig. 2 shows a modification in which the emergency pipe F and a relief pipe H are controlled by a single piston valve A. The spring C bears against a movable piston G' engaged by a set-screw G. The pipe F may deliver to a tank provided with an overflow to the reservoir, sight-feeds extending from the lower part of the tank to the parts intended to receive emergency lubrication.