When the bidirectional manual hydraulic pump reaches the descending part of the curve, the spring forces the plunger downwards, forming a certain degree of vacuum. The oil in the bidirectional manual hydraulic pump tank enters the sealed volume under the action of atmospheric pressure. The cam continuously lifts and lowers the plunger, causing the sealing volume to periodically decrease and increase, and the pump continuously absorbs and discharges oil.

The bidirectional manual hydraulic pump is equipped with an energy storage mechanism to ensure stable pressure, and a specially designed oil tank cover. The bidirectional manual hydraulic pump can achieve oil tank sealing, leak prevention, and breathability to balance the pressure inside and outside the oil tank. The oil tank sealing ring of the bidirectional manual hydraulic pump acts like a safety valve to prevent oil tank overpressure.

In hydraulic systems that operate in high-temperature and flammable environments, bidirectional manual hydraulic pumps use flame-retardant HF hydraulic fluid: hydraulic medium. The wear and erosion of abrasive particles caused by the clearance friction of bidirectional manual hydraulic pumps, as well as the fatigue of rolling bearings, have generated new pollutants. Therefore, some companies have adjusted the technical data of E-series hydraulic piston pumps and motors, and adopted special bearings with "RR" coating for the bearings used in piston pumps based on the characteristics of HF working fluid. But the service life of this type of bearing with "RR" coating is less than 50% of that of mineral oil-based hydraulic oil. HFD anhydrous oil, phosphate esters are not within this range.

Product improvement and editing of bidirectional manual hydraulic pump

1. Improvement of hydraulic system design for bidirectional manual hydraulic pump.

After multiple verifications, the advanced priority valve and load sensing fully hydraulic steering system were finally adopted. The new system can allocate flow to the steering system according to the steering requirements, and the bidirectional manual hydraulic pump can ensure sufficient oil supply regardless of the load size and steering wheel speed. The remaining part can be fully supplied to the working device circuit, thereby eliminating the power loss caused by excessive oil supply in the steering circuit, improving system efficiency, and reducing the working pressure of the hydraulic pump.

2. Optimization design of the boom cylinder and hydraulic pump for bidirectional manual hydraulic pump, reducing system working pressure.

Through optimization calculations, the boom cylinder adopts the standard series 80/4. The displacement of the hydraulic pump has been increased from 10ml/r to 14ml/r, and the system is set to a pressure of 14MPa, which meets the lifting force and speed requirements of the boom cylinder.

3. During the use of a bidirectional manual hydraulic pump, attention should also be paid to the correct use and maintenance of the loader, regularly adding or replacing hydraulic oil, maintaining the cleanliness of the hydraulic oil, and strengthening daily inspection and maintenance.

Application range editing of bidirectional manual hydraulic pump

Bidirectional manual hydraulic pumps are used in industries such as power, railway, rescue, and construction to operate on field sites, providing power for construction equipment such as cutters, hydraulic pliers, and punching machines,

Bidirectional manual hydraulic pump fittings, hoses, valves, pressure vessels, cylinders, etc. provide static and burst testing for aerospace accessories after maintenance.