IGP5-M040-SF-3 Internal Gear Pump 40cc 320bar Low Noise

Product Overview

The IGP5-M040-SF-3 is a high-pressure internal gear pump from the IGP5 series, size 040, with a nominal displacement of 40.0 mL/r. It is a fixed displacement pump featuring an internal gear design with axial and radial gap pressure compensation. The IGP5 series covers a displacement range of 33.1 to 64.9 cm³/rev, including sizes M040, M050, and M063.

The pump’s core technology lies in its bidirectional gap pressure compensation. In the axial direction, pressure fields behind the front and rear side plates balance against the displacement chamber pressure, creating a perfect seal with minimal mechanical losses. In the radial direction, the crescent side plate and crescent main plate achieve automatic clearance adjustment via a plastic locating rod, maintaining high volumetric efficiency even at low speeds and low viscosities. The pump is insensitive to oil cleanliness, has strong anti-contamination capability, and delivers exceptional service life.

Every unit undergoes 100% simulated operating condition testing before shipment, covering rated pressure loading, volumetric efficiency verification, and housing sealing integrity.

Technical Specifications 

• Model: IGP5-M040-SF-3

• Series: IGP5 Series

• Pump Type: Internal gear pump, fixed displacement, with axial and radial gap pressure compensation

• Nominal Displacement: 40.0 mL/r

• Rated Working Pressure: 300 bar

• Maximum Instantaneous Pressure: 315 bar

• Peak Pressure (short-term): 350 bar

• Minimum Speed: 600 rpm

• Maximum Speed: 3,000 rpm

• Theoretical Flow at 1500 rpm: Approx. 60 L/min

• Mounting Flange: SAE 2-hole flange, ISO 3019-1

• Port Connection: SAE J518 C flange connection

• Rotation Direction: Clockwise or counter-clockwise (specified at order)

• Housing Material: High-strength cast iron

• Weight (single pump): Approx. 15.5–18.7 kg (IGP5 series)

• Recommended Fluid Viscosity: 25–100 cSt

• Fluid Temperature Range: -10 °C to +80 °C

• Ambient Temperature Range: -20 °C to +60 °C

Key Technical Advantages

1. Axial and Radial Bidirectional Gap Pressure Compensation: The IGP5-M040-SF-3’s core technical advantage is its patented gap compensation system. Axially, pressure fields behind the front and rear side plates balance against the displacement chamber pressure, creating a perfect axial seal. Radially, the crescent side plate and main plate achieve automatic clearance adjustment via a plastic locating rod. This design maintains high volumetric efficiency even at low speeds (600 rpm) and low viscosities, overcoming the volumetric efficiency limitations of conventional gear pumps at low speeds.

2. Ultra-Low Noise Operation: The pump housing is manufactured from high-strength spherical QT600-3 cast iron with an internal unique noise reduction design. The involute tooth profile features a long meshing length that effectively reduces flow and pressure pulsation, maintaining smooth audio characteristics even at high speeds. This makes it particularly suitable for injection molding machines, servo pump systems, and applications with strict noise requirements.

3. High Contamination Tolerance and Long Service Life: The IGP5 series is insensitive to oil cleanliness with strong anti-contamination capability. Special friction bearings and optimized load distribution enable continuous duty at high pressures, significantly extending service life.

4. Compact High-Power-Density Design: Cast iron construction ensures high-pressure, high-speed capability and instantaneous starting performance. The compact structure saves installation space and facilitates easy installation and maintenance. The wide speed range (600–3,000 rpm) adapts to various drive conditions.

5. Multi-Pump Combination Flexibility: IGP series pumps can be combined to form multi-flow groups suitable for multi-circuit hydraulic systems, enabling flexible configuration according to system requirements while reducing piping connections and installation space.

Application Areas

• Injection Molding Servo Pump Systems: IGP5-M040-SF series is widely used in servo-driven injection molding machines for energy-efficient operation

• Plastic Processing Machinery: Injection molding machines, extruders, blow molding machines

• Forging Equipment: Automated presses, stamping machines, bending machines

• Foundry Equipment: Die-casting machines, foundry machinery hydraulic drives

• Accumulator Charging Systems: Stable flow output for accumulator charging applications

• Industrial Hydraulic Systems: Various industrial equipment requiring low-noise, high-pressure hydraulic power

• Machine Tool Equipment: CNC machine tools, machining center hydraulic power units

• Food Packaging Machinery: IGP5-M040 series suitable for food packaging machinery hydraulic systems

Expert Maintenance Tips

1. Shaft Alignment and Flange Connection: Concentricity deviation between the pump and drive shaft must be less than 0.05 mm, with angular deviation less than 0.25°. The IGP5 series uses an SAE 2-hole flange (ISO 3019-1) with SAE J518 C flange port connections. Tighten flange bolts in diagonal sequence for even loading.

2. Initial Start-Up Filling and Bleeding: Pre-fill the pump housing with clean hydraulic fluid through the drain port before installation. Start at the lowest speed of 600 rpm and observe a steady oil flow from the case drain port free of bubbles. Once bleeding is complete, gradually increase to working pressure. Note that the minimum speed for the IGP5 series is 600 rpm — operating below this speed will affect volumetric efficiency.

3. Fluid Cleanliness and Viscosity Management: Use L-HM 32/46 anti-wear hydraulic oil with a viscosity range of 25–100 cSt and fluid temperature of -10 °C to +80 °C. Although the IGP5 series has strong contamination tolerance, maintaining fluid cleanliness remains critical for extended pump life. Replace hydraulic fluid and filter elements every 1,000 operating hours or annually.

4. Gap Compensation System Inspection: Axial and radial gap compensation is the core technology of this pump. During maintenance, inspect the front and rear side plates (axial compensation) and the crescent side plate and main plate (radial compensation) for wear. The plastic locating rod is a critical component of the radial compensation — replace if worn or deformed.

5. Multi-Pump Combination Installation: When combining the IGP5-M040-SF-3 with other IGP series pumps into a multi-flow group, ensure proper coupling alignment between pumps and verify that the combined drive torque does not exceed the front pump shaft’s load capacity. Consult factory technical support for combination configuration confirmation.

6. Extended Shutdown Protection: For equipment idle longer than 30 days, start the pump once per month and run unloaded for 10 minutes to prevent oil film breakdown on gear meshing surfaces.