1= Gear ; 2= Piston ; 3= Piston chamber ; 4= Spool ; 5= Check valve
Manual lubrication pump SRB, KM series is operated and made reciprocation by steel handle to lubricate through gear 1 and gear piston. When the piston is on the right place, the volume in left side chamber increases to from a vacuum, then the grease or in reservoir is pressurized to left side chamber of piston by the action of spring and piston plate.
When the piston moves to left side, the inner lubricating grease is pressed to channel A and pushes the spool 4 to at the end of right position, grease or oil flows out through open check valve 5. The right side chamber of piston increases at the moment, therefore, the lubricating oil is pressurized in, the full lubricant oil chamber gradually becomes smaller when the piston while the piston moves to right side. The lubrication oil is pressurized to channel B, pushing the spool 4 moves to left side, to open the check valve 5 and discharging grease or oil.
The directional control valve is equipped at the bottom of manual lubrication pump SRB, KM series, the dual line supplying is available if switching the spool position of directional valve by operation the valve level.