German EVA SEIM POMPES pump EVA SEIM POMPES model EVA SEIM POMPES price

EVA SEIM POMPES pumps are widely used in shipbuilding, coal mining machinery, petrochemical, metallurgy, electric power, and heavy machinery as a simple and convenient hydraulic power source. They are accepted by many users for their advantages such as small size, light weight, portability, and high safety. The function of a hand pump is to convert the mechanical energy of a prime mover (such as an electric motor or internal combustion engine) into fluid pressure energy.

EVA SEIM POMPES pump operating principle

The cam is driven to rotate by an electric motor. When the cam pushes the plunger upward, the sealed volume formed by the plunger and cylinder body decreases, squeezing oil out of the sealed volume and discharging it to the required location via a check valve. When the cam rotates to the descending part of the curve, the spring forces the plunger downward, creating a certain vacuum degree, allowing oil from the tank to enter the sealed volume under atmospheric pressure. The cam causes the plunger to move up and down continuously, periodically decreasing and increasing the sealed volume, so the pump continuously sucks and discharges oil.

EVA SEIM POMPES pump industry applications

Industries such as electric power, railway, rescue, and construction operate in field sites, providing power for construction tools like cutters, hydraulic clamps, and punching machines; providing static and burst testing for pipe fittings, hoses, valves, pressure vessels, and cylinders; static and dynamic testing after aerospace accessory maintenance; safety valve calibration; bubble tests for valves and wellhead devices in water; detection of pressure regulators; automotive braking system testing; and communication cable inflation equipment.

EVA SEIM POMPES pump maintenance

During maintenance, troubleshoot from the following three points and improve the system: 1) Check for internal leakage in the boom cylinder: The simplest method is to raise the boom and observe if there is significant free descent. If the descent is obvious, disassemble the cylinder for inspection; replace the seal ring if wear is found. 2) Check the control valve: First clean the safety valve and check if the valve core is worn; replace if worn. If there is no change after installing the safety valve, check the wear condition of the control valve core; the general limit for clearance usage is 0.06mm, and severe wear requires replacement. 3) Measure the hydraulic pump pressure: If the pressure is low, adjust it; if the pressure still cannot be increased, it indicates severe wear of the hydraulic pump. The main reasons for the inability to lift the boom under load are: 1) Severe wear of the hydraulic pump. Internal leakage is severe during low-speed operation; during high-speed operation, pump pressure increases slightly, but volumetric efficiency drops significantly due to pump wear and internal leakage, making it difficult to reach rated pressure. Prolonged operation of the hydraulic pump exacerbates wear, raises oil temperature, causing wear of hydraulic components and aging/damage of seals, loss of sealing capability, deterioration of hydraulic oil, and finally leading to failure. 2) Unreasonable selection of hydraulic components. The boom cylinder specification is 70/40 non-standard series, and the seals are also non-standard parts, resulting in high manufacturing costs and inconvenient seal replacement. The small bore diameter of the boom cylinder inevitably leads to high system setting pressure. 3) Unreasonable hydraulic system design. As shown in Figure 1, the control valve and the full hydraulic steering gear are connected in series with a single pump. The safety valve setting pressure is 16MPa, and the rated working pressure of the hydraulic pump is also 16MPa. The hydraulic pump often operates under full load or long-term overload (high pressure), and the system experiences hydraulic shock. Long-term lack of oil changes leads to contaminated hydraulic oil, exacerbating hydraulic pump wear, even causing the pump housing to crack (such failures have been observed).

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