Closed power fluid system of hydraulic piston pump

In most cases, the closed water system for power fluid power fluid, because compared to water and oil, the frictional resistance is small, the risk of small, less impact on the environment. But water as the power fluid, you need to add a lubricant,  fuel dispensing pump and the need for anti-corrosion treatment, which will increase the production and management costs.

To adapt to the conditions, the reservoir depth and displacement range; wax; heavy oil; inclination. The main drawback, mechanical fuel level gauge ,the unit complex, high precision machining.