The Surematic pump is a pneumatically operated piston pump, intended for use in progressive type, lubrication systems. Stroke of pump is adjustable from 1 to 8 cc, while output pressure is regulated by incoming air pressure and the 18/1 pressure ratio. The Surematic pump is available with 2, 3.5 and 5kg reservoirs and with low level switch as standard.
When air is supplied to the 1/8 NPTF inlet (via a 3/2 solenoid valve), the air piston moves forward and forces lubricant through the outlet check valve. The inlet check valve prevents lubricant from going back into the reservoir. A vent valve in the cylinder prevents a vacuum from developing on the downstream side of the air piston. When the 3/2 valve is de-activated, the air pressure is vented, and the piston returns to its initial position. Lubricant is drawn in from the reservoir, via the inlet check valve, and the outlet check valve prevents drawing in lubricant from the main line.