There are two kinds of power loss when the hydraulic pump is working, one power loss is volume loss, and the other is mechanical loss.

Cause of mechanical damage - odm hydraulic pump supplier

• When the hydraulic pump is working, there is mechanical friction between the relative moving parts, such as between the bearing and the shaft, between the shaft and the seal, and between the vane and the inner wall of the pump, resulting in frictional resistance loss. This loss is related to the output pressure of the hydraulic pump. The higher the output pressure, the greater the frictional resistance loss.

• When the oil flows in the pump, viscous resistance is generated due to the viscosity of the liquid, which will also cause mechanical losses. This loss is related to the viscosity of the oil and the speed of the pump. The more viscous the oil and the higher the speed of the pump, the greater the mechanical loss.

Due to the above reasons, the actual input power of the pump is greater than the theoretically required power. The ratio of the theoretical input power of the hydraulic pump to the actual input power is called mechanical efficiency, which indicates the degree of power loss. The ratio of the output power of the hydraulic pump to the input power is called the total efficiency of the hydraulic pump.

Cause of volume loss

• Although the oil suction chamber and the oil discharge chamber of the positive displacement hydraulic pump are separated in the pump, there is always a certain gap in the relative movement, so the oil in the high-pressure area in the pump must leak into the low-pressure area through the gap. The lower the viscosity of the hydraulic oil and the higher the pressure, the greater the leakage.

• During the oil suction process of the hydraulic pump, the suction phenomenon of the pump will be caused due to the high oil suction resistance, the oil being too viscous or the pump shaft speed being too high so that the working volume of the seal cannot be filled with oil, that is to say, the hydraulic pump’s The working chamber is not fully utilized.

However, as long as the pump is designed correctly and used reasonably, the loss caused by the second reason can be overcome, that is, the volume loss of the pump can be reduced.

However, the volume loss caused by leakage when the hydraulic pump is working is inevitable, that is, the volume loss of the pump can be approximately regarded as all caused by leakage so that the actual flow of the hydraulic pump is always less than the theoretical flow

The ratio of the actual flow to the logical flow is called the volumetric efficiency, which indicates the degree of the volume loss of the hydraulic pump. The volumetric efficiency of the hydraulic pump indicates the magnitude of the volumetric loss of the hydraulic pump.

YAHO - odm hydraulic pump supplier

Available in types including wastewater pumps, sump pumps, effluent pumps, solids handling centrifugal pumps, submersible pumps, sewage pumps, end suction centrifugal pumps, self-priming suction pumps, high pressure multi-stage pumps, in-line circulation pumps, vertical immersed pumps, self-priming vertical in-line centrifugal pumps & self priming solids handling centrifugal pumps. Pumps are used for booster service, liquid transfer, spray systems, water circulation & dewatering applications in municipal, petroleum, chemical, agricultural, commercial & industrial market.

YAHO Vertical Immersed pumps:(odm hydraulic pump supplier)

304 and 316 stainless steal pumps for machine tool, wash system and tank mount applications.

Pump head is immersed in pumped liquid. May be set at various depths depending on tank.

Single stage and high pressure multistage versions are available.

YAHO Submersible pumps:(odm hydraulic pump supplier)

Sump pumps for residential and light commercial cellar or pit draining of dear water.

Effluent pump for dirty water, grey water and small suspended solids.

Sewage pumps for larger suspensions of soft solids.

Stainless steel versions have air filled motors cooled by the pumped fluid. Cast iron models are oil filled.

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