Dry running refers to the pump operating without liquid intake. Our NP Series pumps utilize special self-lubricating materials and possess excellent dry-running tolerance (e.g., the NP039 model has passed a 100-hour continuous dry run test). However, prolonged dry running should still be avoided. Each series has maximum allowable dry running speeds and time limits.

Options include: AC motors (fixed speed/variable frequency/explosion-proof), Brushless DC (BLDC) motors (recommended for precise speed control), Stepper/Servo motors (for extremely high precision metering). We will calculate the required power and match a motor based on your operating conditions (flow, pressure, viscosity).

Flow Rate: Primarily achieved by adjusting the motor speed.
Pressure: The pump does not directly "set" the pressure; pressure is determined by the system load. To stabilize pressure, a pressure relief/stabilizing valve can be installed at the outlet.

Yes. Because gear pumps lack built-in check valves. If prevention is needed, an external check valve can be installed at the pump outlet.

Decoupling occurs when the pump load is excessive or the gears jam abnormally, exceeding the torque capacity of the magnetic coupling. This is accompanied by noise. The motor should be stopped immediately to troubleshoot the fault.

Yes, but the flow rate will be lower in reverse compared to forward operation, and the pressure must not exceed 1 bar. Continuous operation in reverse is not recommended.

Wearable parts include: Drive/Driven gear shafts, bearings, internal magnetic rotor, PTFE seals. For critical processes, it is recommended to have one operating unit and one standby unit, or purchase a set of wearable spare parts as an emergency solution. Our precision micro gear pumps feature a modular design for quick and easy replacement of wearable parts.

1) If the solution contains particles, a filter of ≥400 mesh must be installed.
2) The inlet pipe should be short and straight, with a diameter not smaller than the pump port.
3) The inlet vacuum should not be lower than -0.85 Bar.

Motor speed and medium viscosity need to be mutually adapted: As viscosity increases, the motor speed should be appropriately reduced.

It refers to the medium inside the pump cavity flowing back to the low-pressure area through internal clearances (primarily the clearance between the gear faces and the pump body). As medium viscosity increases, the internal leakage decreases.

The difference stems from "internal leakage". High-pressure liquid from the outlet leaks back to the inlet end through the minute clearances between the gears and the pump body. The higher the differential pressure, the greater the leakage, and the smaller the actual flow.

If the inlet is under negative pressure (vacuum), the pump's flow rate will decrease. When the inlet vacuum is too high, causing NPSHa < NPSHr, cavitation will occur, and the pump will be unable to operate. The inlet conditions must be ensured to meet requirements.

The internal space of the pump head is extremely limited. A built-in safety valve would cause the liquid to circulate internally at high speed, leading to a sharp temperature rise, potentially causing liquid degradation or pump damage. It is recommended to install a safety valve in the external pipeline.