These hydraulic pumps are reciprocating, valve controlled plungerpumps. They are basically oscillating pneumatic/hydraulic pressureintensifiers which are available in three sizes. These pumps stopautomatically when the opposing forces on the pneumatic side of the piston are in equilibrium with the forces on the hydraulic side. Likewise thepumps will start when the forces are unequal. This force equivalent alsodetermines the cycle frequency. The hydraulic pumps type LP are available in various versions e.g. pumponly, hydraulic power pack with tank or as turn-key power pack with therequired directional valves directly mounted. These pumps are commonlyused in hazardous areas where electricmotor drive pumps may cause fire orexplosion such as in dye works, mining, pyrotechnic industry, petroleum refineries etc. These pumps also perform well inlaboratory presses, jigs or lubricationapplications.