Pump is engine equipment of jacks. ZB4-500 AND ZB4-500S type hydraulic pump is engine and operation parts of pulling machine for strand and steel bar, is accessed with all kinds of jacks which is of specified oil pressure below 500Mpa, moreover it can be used for other type low flow-meter but high pressure hydraulic machine. ZB4-500S is designed on the basis of ZB4-500, which is installed a valve of three position four way directional valve; it has advantage of which you needn’t to change the oil pipe and finish the work of tension and anchorage in same course.

TYPE	Rated oil pressure	Rated flow	Weight	Range of application
ZB4 – 500	50	2*2	120	To be used in conjunction with various jacks, lock grippers, and extruding machines with a rated pressure of 50MPa, a tensile force of less than 4000KN, and a stroke of less than 4000mm.
ZB4 – 500S	50	2*2	120	Based on the ZB4-500 oil pump, an FL-type flow divider valve is added to create a three-circuit oil supply. It is used in conjunction with jacks equipped with uplifters.
ZB4 – 500	50	10	200	This system is matched for high-capacity, long-stroke jacks that require high-speed operation, which typically refers to jacks with a rated tensile force exceeding 5,000KN and a stroke greater than 500 mm. The unit incorporates a ZB10/320-4/800 two-stage variable displacement pump.
ZB10/320 – 4/800	32 80	10 4	270
ZB1 – 630	63	1	56	Designed for jacks with a rated tensile force under 250 kN, making it ideal for operation in confined spaces and at elevated heights.