two stage hydraulic pump diagram made in china

If the check valve would fail the 2 pumps would always work together under low pressure until it would entirely fail under higher pressures (under pressures higher than the set pressure of the relief valve/control valve (you called it unloading valve). I heard this relief pressure would be at about 900 psi).

However the pump will produce a fair amount of suction pressure if there was an obstruction and I doubt that this can happen with sufficient oil in the thank.

Control: Push Button Stop/ Start, Lever Valve Action - Control lever forward: Pump into hose A / Control lever backward: Returns to reservoir on hose A

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2. The highest rotation speed shall be limited within 1200r/min, while applying with water-based synthetic hydraulic fluids. The application of PV2R series double hydraulic vane pumps : Dongguan blince machinery and electronics co. 2. We are not only produce normal models, but also produce new models according to your design.

The chain pump is type of a water pump in which several circular discs are positioned on an endless chain. One part of the chain dips into the water, and the chain runs through a tube, slightly bigger than the diameter of the discs. As the chain is drawn up the tube, water becomes trapped between the discs and is lifted to and discharged at the top. Chain pumps were used for centuries in the ancient Middle East, Europe, and China.

A version of the chain pump was used in Ancient Greek and Roman, sometimes with pots, or scoops fixed to the chain, which, as they passed over the top pulley, tipped the water out; a 2nd century example is preserved in London.Philo of Byzantium wrote of such a device in the 2nd century B.C.;Vitruvius mentioned them around 30 B.C. Fragments of the cogs, crank, and discs, of a Bilge pump, from a 1st Century Roman barge, were unearthed at Lake Nemi.

Chain pumps were also used in ancient China from at least the 1st century A.D. In China, they were also called dragon backbones.philosopher Wang Chong (A.D. 27–97) around A.D. 80.hydraulics of a rushing current against a horizontal water wheel acting against a vertical wheel,oxen

From the 1st century onwards, chain pumps were widespread throughout the Chinese countryside.irrigation, though they found use in public works as well. The infamous Eastern Han court eunuch Zhang Rang (d. A.D. 189) once ordered the engineer Bi Lan (畢嵐) to construct a series of square-pallet chain pumps outside the capital city Luoyang.palaces and living quarters of the Luoyang; the water lifted by the chain pumps was brought in by a pipe system.Ma Jun, the renowned mechanical engineer of the Three Kingdoms era, also constructed a series of chain pumps for watering the palatial gardens of Emperor Ming of Wei (226–239).

During the period of agricultural expansion in Song China (10th-13th centuries CE), the technology of water-rising devices was improved. For some centuries they had been used for moving water for drainage or irrigation purposes. The simplest design, known as the counterbalanced bucket or "swape" or "well-sweep" was in common use at that time. A more complicated design, the "square-pallet chain pump", was introduced several centuries before the growth in Song technology, but had not seen prior use for farming. They became more common around the end of the first millennium AD.

From the 13th century onwards, the Chinese also used windmills (acquired from the Middle East) to power square-pallet chain pumps.Song Yingxing"s (1587–1666) encyclopedic book the Tiangong Kaiwu (1637), there is description and illustration of a cylinder chain pump, powered by waterwheels and leading water up from the river to an elevated plain of agricultural crops.

The contribution of chain pumps to agricultural growth during the Song was extolled by poets such as Li Chuquan (李处权) of the twelfth century. The Song government actively spread the technology, introducing pumping equipment and chain pumps to those areas as yet unfamiliar with the technique.

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Large suction inlets and full flow waterways cut friction loss and deliver maximum pressure at the discharge valves. Low friction losses allow flows of up to 1,500 on 3-inch and 2,600 GPM on 4-inch pump body openings (from a positive water source)